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Zebra_cURL.php
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Zebra_cURL.php
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<?php
/**
* A high-performance solution for making HTTP requests from your PHP projects.
*
* Zebra cURL allows you to run multiple requests concurrently, asynchronously, and supports a wide range of HTTP methods,
* including GET, POST, HEADER, PUT, PATCH, and DELETE. In addition to basic requests, this library also offers support
* for caching, FTP downloads, HTTP authentication, and proxy requests. This makes it a versatile tool for a wide range
* of applications and environments. Whether you're working on a simple script or a complex system, Zebra cURL can help
* you streamline your workflow and improve your application's performance.
*
* Read more {@link https://github.com/stefangabos/Zebra_cURL/ here}.
*
* @author Stefan Gabos <contact@stefangabos.ro>
* @version 1.6.3 (last revision: September 14, 2024)
* @copyright © 2013 - 2024 Stefan Gabos
* @license https://www.gnu.org/licenses/lgpl-3.0.txt GNU LESSER GENERAL PUBLIC LICENSE
* @package Zebra_cURL
*/
class Zebra_cURL {
/**
* The number of seconds to wait between processing batches of requests.
*
* If the value of this property is greater than `0`, the library will process as many requests as defined by the
* {@link threads} property and then wait for {@link pause_interval} seconds before processing the next batch of
* requests.
*
* Default is `0` (the library will keep as many parallel threads as defined by {@link threads} running at all times
* until there are no more requests to process).
*
* @since 1.3.0
*
* @var integer
*/
public $pause_interval;
/**
* The number of parallel, asynchronous requests to be processed by the library, at once.
*
* <code>
* // process 30 simultaneous requests at once
* $curl->threads = 30;
* </code>
*
* Note that unless {@link pause_interval} is set to a value greater than `0`, the library will process a constant
* number of requests, at all times; it is doing this by starting a new request as soon as another one finishes.
*
* If {@link pause_interval} is set to a value greater than `0`, the library will process as many requests as set
* by the {@link threads} property and then wait for {@link pause_interval} seconds before processing the next
* batch of requests.
*
* Default is `10`
*
* @var integer
*/
public $threads;
/**
* Used by the {@cache} method to cache request details
*
* @var array<mixed>|boolean
* @access private
*/
private $cache;
/**
* Used by the {@link option} method to store the cURL options.
*
* @var array<int>
* @access private
*/
private $options;
/**
* Used by the {@link _process} method to determine whether to run processed requests' bodies through PHP's
* {@link https://php.net/manual/en/function.htmlentities.php htmlentities} function.
*
* Default is TRUE. Can be changed by instantiating the library with the FALSE argument.
*
* @var boolean
* @access private
*/
private $_htmlentities;
/**
* Used to tell the library whether to queue requests or to process them right away
*
* @var boolean
* @access private
*/
private $_queue;
/**
* The cURL multi handle
*
* @var resource|boolean
* @access private
*/
private $_multi_handle;
/**
* Used to keep track of all the requests that need to be processed.
*
* @var array<mixed>
* @access private
*/
private $_requests;
/**
* An associative array linked with all the resources, used to store original URL and file pointer resources, used
* for streaming downloads.
*
* @var array<mixed>
* @access private
*/
private $_running;
/**
* As of PHP 8 we use an extra map as a helper.
*
* @var array<string>
* @access private
*/
private $_running_map;
/**
* Possible values of the "result" attribute in the object passed to the callback function.
* List is kept up to date with the {@link https://github.com/curl/curl/blob/master/include/curl/curl.h source code of curl}
*
* @var array<string>
* @access private
*/
private $_response_messages = array(
0 => 'CURLE_OK',
1 => 'CURLE_UNSUPPORTED_PROTOCOL',
2 => 'CURLE_FAILED_INIT',
3 => 'CURLE_URL_MALFORMAT',
4 => 'CURLE_NOT_BUILT_IN',
5 => 'CURLE_COULDNT_RESOLVE_PROXY',
6 => 'CURLE_COULDNT_RESOLVE_HOST',
7 => 'CURLE_COULDNT_CONNECT',
8 => 'CURLE_WEIRD_SERVER_REPLY',
9 => 'CURLE_REMOTE_ACCESS_DENIED',
10 => 'CURLE_FTP_ACCEPT_FAILED',
11 => 'CURLE_FTP_WEIRD_PASS_REPLY',
12 => 'CURLE_FTP_ACCEPT_TIMEOUT',
13 => 'CURLE_FTP_WEIRD_PASV_REPLY',
14 => 'CURLE_FTP_WEIRD_227_FORMAT',
15 => 'CURLE_FTP_CANT_GET_HOST',
16 => 'CURLE_HTTP2',
17 => 'CURLE_FTP_COULDNT_SET_TYPE',
18 => 'CURLE_PARTIAL_FILE',
19 => 'CURLE_FTP_COULDNT_RETR_FILE', // NOT USED
20 => 'CURLE_OBSOLETE20',
21 => 'CURLE_QUOTE_ERROR',
22 => 'CURLE_HTTP_RETURNED_ERROR',
23 => 'CURLE_WRITE_ERROR', // NOT USED
24 => 'CURLE_OBSOLETE24',
25 => 'CURLE_UPLOAD_FAILED',
26 => 'CURLE_READ_ERROR',
27 => 'CURLE_OUT_OF_MEMORY',
28 => 'CURLE_OPERATION_TIMEDOUT', // NOT USED
29 => 'CURLE_OBSOLETE29',
30 => 'CURLE_FTP_PORT_FAILED',
31 => 'CURLE_FTP_COULDNT_USE_REST', // NOT USED
32 => 'CURLE_OBSOLETE32',
33 => 'CURLE_RANGE_ERROR',
34 => 'CURLE_HTTP_POST_ERROR',
35 => 'CURLE_SSL_CONNECT_ERROR',
36 => 'CURLE_BAD_DOWNLOAD_RESUME',
37 => 'CURLE_FILE_COULDNT_READ_FILE',
38 => 'CURLE_LDAP_CANNOT_BIND',
39 => 'CURLE_LDAP_SEARCH_FAILED', // NOT USED
40 => 'CURLE_OBSOLETE40', // NOT USED SINCE curl 7.53.0
41 => 'CURLE_FUNCTION_NOT_FOUND',
42 => 'CURLE_ABORTED_BY_CALLBACK',
43 => 'CURLE_BAD_FUNCTION_ARGUMENT', // NOT USED
44 => 'CURLE_OBSOLETE44',
45 => 'CURLE_INTERFACE_FAILED', // NOT USED
46 => 'CURLE_OBSOLETE46',
47 => 'CURLE_TOO_MANY_REDIRECTS',
48 => 'CURLE_UNKNOWN_OPTION',
49 => 'CURLE_SETOPT_OPTION_SYNTAX', // NOT USED
50 => 'CURLE_OBSOLETE50', // NOT USED
51 => 'CURLE_OBSOLETE51',
52 => 'CURLE_GOT_NOTHING',
53 => 'CURLE_SSL_ENGINE_NOTFOUND',
54 => 'CURLE_SSL_ENGINE_SETFAILED',
55 => 'CURLE_SEND_ERROR',
56 => 'CURLE_RECV_ERROR', // NOT USED
57 => 'CURLE_OBSOLETE57',
58 => 'CURLE_SSL_CERTPROBLEM',
59 => 'CURLE_SSL_CIPHER',
60 => 'CURLE_PEER_FAILED_VERIFICATION',
61 => 'CURLE_BAD_CONTENT_ENCODING', // NOT USED SINCE curl 7.82.0
62 => 'CURLE_OBSOLETE62',
63 => 'CURLE_FILESIZE_EXCEEDED',
64 => 'CURLE_USE_SSL_FAILED',
65 => 'CURLE_SEND_FAIL_REWIND',
66 => 'CURLE_SSL_ENGINE_INITFAILED',
67 => 'CURLE_LOGIN_DENIED',
68 => 'CURLE_TFTP_NOTFOUND',
69 => 'CURLE_TFTP_PERM',
70 => 'CURLE_REMOTE_DISK_FULL',
71 => 'CURLE_TFTP_ILLEGAL',
72 => 'CURLE_TFTP_UNKNOWNID',
73 => 'CURLE_REMOTE_FILE_EXISTS',
74 => 'CURLE_TFTP_NOSUCHUSER',
75 => 'CURLE_CONV_FAILED', // NOT USED SINCE curl 7.82.0
76 => 'CURLE_OBSOLETE76',
77 => 'CURLE_SSL_CACERT_BADFILE',
78 => 'CURLE_REMOTE_FILE_NOT_FOUND',
79 => 'CURLE_SSH',
80 => 'CURLE_SSL_SHUTDOWN_FAILED',
81 => 'CURLE_AGAIN',
82 => 'CURLE_SSL_CRL_BADFILE',
83 => 'CURLE_SSL_ISSUER_ERROR',
84 => 'CURLE_FTP_PRET_FAILED',
85 => 'CURLE_RTSP_CSEQ_ERROR',
86 => 'CURLE_RTSP_SESSION_ERROR',
87 => 'CURLE_FTP_BAD_FILE_LIST',
88 => 'CURLE_CHUNK_FAILED',
89 => 'CURLE_NO_CONNECTION_AVAILABLE',
90 => 'CURLE_SSL_PINNEDPUBKEYNOTMATCH',
91 => 'CURLE_SSL_INVALIDCERTSTATUS',
92 => 'CURLE_HTTP2_STREAM',
93 => 'CURLE_RECURSIVE_API_CALL',
94 => 'CURLE_AUTH_ERROR',
95 => 'CURLE_HTTP3',
96 => 'CURLE_QUIC_CONNECT_ERROR',
97 => 'CURLE_PROXY',
98 => 'CURLE_SSL_CLIENTCERT',
);
/**
* Stores the result of a call to the {@link scrape} method
*
* @var mixed
*
* @access private
*/
private $_scrape_result;
/**
* Constructor of the class.
*
* Below is the list of default options set by the library when instantiated. Various methods of the library may
* overwrite some of these options when called (see {@link delete}, {@link download}, {@link ftp_download}, {@link get},
* {@link header}, {@link post}, {@link put}). The value of any of these options may also be changed with the
* {@link option} method. For a full list of available options and their description, consult the
* {@link https://www.php.net/manual/en/function.curl-setopt.php PHP documentation}.
*
* - `CURLINFO_HEADER_OUT` - the last request string sent<br>
* default: `TRUE`
*
* - `CURLOPT_AUTOREFERER` - TRUE to automatically set the *"Referer:"* field in requests where it follows
* a *"Location:"* redirect<br>
* default: `TRUE`
*
*
* - `CURLOPT_COOKIEFILE` - the name of the file containing the cookie data. the cookie file can be in
* Netscape format, or just plain HTTP-style headers dumped into a file. if the
* name is an empty string, no cookies are loaded, but cookie handling is still
* enabled<br>
* default: `an empty string`
*
* - `CURLOPT_CONNECTTIMEOUT` - the number of seconds to wait while trying to connect<br>
* default: `10` (use `0` to wait indefinitely)
*
* - `CURLOPT_ENCODING` - the contents of the "Accept-Encoding: " header. this enables decoding of the
* response. supported encodings are *identity*, *deflate*, and *gzip*. if an
* empty string is set, a header containing all supported encoding types is sent<br>
* default: `gzip,deflate`
*
* - `CURLOPT_FOLLOWLOCATION` - TRUE to follow any *"Location:"* header that the server sends as part of the
* HTTP header (note this is recursive, PHP will follow as many *"Location:"*
* headers that it is sent, unless `CURLOPT_MAXREDIRS` is set - see below)<br>
* default: `TRUE`
*
* - `CURLOPT_HEADER` - TRUE to include the header in the output<br>
* default: `TRUE`
*
* - `CURLOPT_MAXREDIRS` - the maximum amount of HTTP redirections to follow. use this option alongside
* `CURLOPT_FOLLOWLOCATION` - see above<br>
* default: `50`
*
* - `CURLOPT_RETURNTRANSFER` - TRUE to return the transfer's body as a string instead of outputting it
* directly<br>
* default: `TRUE`
*
* - `CURLOPT_SSL_VERIFYHOST` - 1 to check the existence of a common name in the SSL peer certificate. 2 to
* check the existence of a common name and also verify that it matches the
* hostname provided. 0 to not check the names<br>
* see the {@link ssl} method for more info<br>
* default: `TRUE`
*
* - `CURLOPT_SSL_VERIFYPEER` - FALSE to stop cURL from verifying the peer's certificate<br>
* see the {@link ssl} method for more info<br>
* default: `TRUE`
*
* - `CURLOPT_TIMEOUT` - the maximum number of seconds to allow cURL functions to execute<br>
* default: `10`
*
* - `CURLOPT_USERAGENT` - a (slightly) random user agent (Internet Explorer 9 or 10, on Windows Vista,
* 7 or 8, with other extra strings). Some web services will not respond unless
* a valid user-agent string is provided
*
* @param boolean $htmlentities (Optional) Instructs the script whether the response body returned by the
* {@link get} and {@link post} methods should be run through PHP's
* {@link https://php.net/manual/en/function.htmlentities.php htmlentities}
* function.
*
* Default is `TRUE`
*
* @return void
*/
public function __construct($htmlentities = true) {
// if the cURL extension is not available, trigger an error and stop execution
if (!extension_loaded('curl')) trigger_error('php_curl extension is not loaded', E_USER_ERROR);
// initialize some private properties
$this->_multi_handle = $this->_queue = false;
$this->_running = $this->_running_map = $this->_requests = array();
// the default number of seconds to wait between processing batches of requests
// 0 means no waiting, process all requests at once
$this->pause_interval = 0;
// the default number of parallel, asynchronous, requests to be processed by the library at all times
// (unless the "pause_interval" property is greater than 0, case in which it refers to the number of requests
// to be processed before pausing)
$this->threads = 10;
// set the user's preference on whether to run htmlentities() on the response body or not
$this->_htmlentities = $htmlentities;
// set defaults for libcurl
// set defaults
$this->option(array(
// include the last request headers as a property of the object given as argument to the callback
CURLINFO_HEADER_OUT => 1,
// automatically set the "Referer:" field where it follows a "Location:" redirect
CURLOPT_AUTOREFERER => 1,
// the name of the file containing the cookie data; if the name is an empty string, no cookies are
// loaded, but cookie handling is still enabled
CURLOPT_COOKIEFILE => '',
// the number of seconds to wait while trying to connect
CURLOPT_CONNECTTIMEOUT => 10,
// the contents of the "Accept-Encoding:" header; it enables decoding of the response
CURLOPT_ENCODING => 'gzip,deflate',
// follow any "Location:" header that the server sends as part of the HTTP header - note this is recursive
// and that PHP will follow as many "Location:" headers as specified by CURLOPT_MAXREDIRS
CURLOPT_FOLLOWLOCATION => 1,
// include the response header(s) as a property of the object given as argument to the callback
CURLOPT_HEADER => 1,
// the maximum amount of HTTP redirects to follow; used together with CURLOPT_FOLLOWLOCATION
CURLOPT_MAXREDIRS => 50,
// the maximum number of seconds to allow cURL functions to execute before timing out
CURLOPT_TIMEOUT => 30,
// most services/websites will block requests with no/invalid user agents
// note that the user agent string is random and will change whenever the library is instantiated!
CURLOPT_USERAGENT => $this->_user_agent(),
// return the transfer as a string of instead of outputting it to the screen
CURLOPT_RETURNTRANSFER => 1,
));
// if PHP version is at least 5.5
if (version_compare(PHP_VERSION, '5.5') >= 0)
// disable usage of @ in POST arguments
// see https://wiki.php.net/rfc/curl-file-upload
$this->option(CURLOPT_SAFE_UPLOAD, true);
// set defaults for accessing HTTPS servers
$this->ssl();
// caching is disabled by default
$this->cache(false);
}
/**
* Enables caching of request results.
*
* > Note that in case of downloads, only the actual request is cached and not the associated downloads
*
* <code>
* // instantiate the class
* $curl = new Zebra_cURL();
*
* // if making requests over HTTPS we need to load a CA bundle
* // so we don't get CURLE_SSL_CACERT response from cURL
* // you can get this bundle from https://curl.se/docs/caextract.html
* $curl->ssl(true, 2, 'path/to/cacert.pem');
*
* // cache results in the "cache" folder and for 86400 seconds (24 hours)
* $curl->cache('cache', 86400);
*
* // fetch the RSS feeds of some popular tech-related websites
* // and execute a callback function for each request, as soon as it finishes
* $curl->get(array(
*
* 'https://alistapart.com/main/feed/',
* 'https://www.smashingmagazine.com/feed/',
* 'https://code.tutsplus.com/posts.atom',
*
* // the callback function receives as argument an object with 4 properties
* // (info, header, body and response)
* ), function($result) {
*
* // everything went well at cURL level
* if ($result->response[1] == CURLE_OK) {
*
* // if server responded with code 200 (meaning that everything went well)
* // see https://httpstatus.es/ for a list of possible response codes
* if ($result->info['http_code'] == 200) {
*
* // see all the returned data
* print_r('<pre>');
* print_r($result);
*
* // show the server's response code
* } else trigger_error('Server responded with code ' . $result->info['http_code'], E_USER_ERROR);
*
* // something went wrong
* // ($result still contains all data that could be gathered)
* } else trigger_error('cURL responded with: ' . $result->response[0], E_USER_ERROR);
*
* });
* </code>
*
* @param mixed $path Path where cache files to be stored.
*
* Setting this to `FALSE` will disable caching.
*
* *If set to a non-existing path, the library will try to create the folder
* and will trigger an error if, for whatever reasons, it is unable to do so. If the
* folder can be created, its permissions will be set to the value of the $chmod
* argument.*
*
* @param integer $lifetime (Optional) The number of seconds after which cache will be considered expired.
*
* Default is `3600` (one hour).
*
* @param boolean $compress (Optional) If set to `TRUE`, cache files will be
* {@link https://php.net/manual/en/function.gzcompress.php gzcompress}-ed so that
* they occupy less disk space.
*
* Default is `TRUE`.
*
* @param integer $chmod (Optional) The file system permissions to be set for newly created cache files.
*
* I suggest using the value `0755` but, if you know what you are doing, here is how
* you can calculate the permission levels:
*
* - 400 Owner Read
* - 200 Owner Write
* - 100 Owner Execute
* - 40 Group Read
* - 20 Group Write
* - 10 Group Execute
* - 4 Global Read
* - 2 Global Write
* - 1 Global Execute
*
* Default is `0755`.
*
* @return void
*/
public function cache($path, $lifetime = 3600, $compress = true, $chmod = 0755) {
// if caching is not explicitly disabled
if ($path !== false) {
// if path doesn't exist, attempt to create it
if (!is_dir($path)) @mkdir($path, $chmod, true);
// save cache-related properties
$this->cache = array(
'path' => $path,
'lifetime' => $lifetime,
'chmod' => $chmod,
'compress' => $compress,
);
// if caching is explicitly disabled, set this property to FALSE
} else $this->cache = false;
}
/**
* Sets the path and name of the file to save cookie to / retrieve cookies from. All cookie data will be stored in
* this file on a per-domain basis. Important when cookies need to stored/restored to maintain status/session of
* requests made to the same domains.
*
* This method will automatically set the `CURLOPT_COOKIEJAR` and `CURLOPT_COOKIEFILE` options.
*
* @param string $path The path to a file to save cookies to / retrieve cookies from.
*
* *If file does not exist the library will attempt to create it and, if it is unable to
* do so, it will trigger an error.*
*
* @return void
*/
public function cookies($path) {
// file does not exist
if (!is_file($path)) {
// attempt to create it
if (!($handle = fopen($path, 'a')))
// if file could not be created, trigger an error
trigger_error('File "' . $path . '" for storing cookies could not be found nor could it automatically be created! Make sure either that the path to the file points to a writable directory, or create the file yourself and make it writable', E_USER_ERROR);
// if file could be create, release handle
fclose($handle);
}
// set these options
$this->option(array(
CURLOPT_COOKIEJAR => $path, // for writing
CURLOPT_COOKIEFILE => $path, // for reading
));
}
/**
* Performs an HTTP `DELETE` request to one or more URLs with optional POST data, and executes the callback
* function specified by the *$callback* argument for each and every request, as soon as the request finishes.
*
* This method will automatically set the following options:
*
* - `CURLINFO_HEADER_OUT` = `TRUE`
* - `CURLOPT_CUSTOMREQUEST` = `DELETE`
* - `CURLOPT_HEADER` = `TRUE`
* - `CURLOPT_NOBODY` = `FALSE`
* - `CURLOPT_POST` = `FALSE`
* - `CURLOPT_POSTFIELDS` = the POST data
*
* ...and will unset the following options:
*
* - `CURLOPT_BINARYTRANSFER`
* - `CURLOPT_HTTPGET`
* - `CURLOPT_FILE`
*
* Multiple requests are processed asynchronously, in parallel, and the callback function is called for each and every
* request as soon as the request finishes. The number of parallel requests to be constantly processed, at all times,
* is set through the {@link threads} property. See also {@link pause_interval}.
*
* > Because requests are done asynchronously, when initiating multiple requests at once, these may not finish in
* the order in which they were initiated!
*
* <code>
* // instantiate the class
* $curl = new Zebra_cURL();
*
* // if making requests over HTTPS we need to load a CA bundle
* // so we don't get CURLE_SSL_CACERT response from cURL
* // you can get this bundle from https://curl.se/docs/caextract.html
* $curl->ssl(true, 2, 'path/to/cacert.pem');
*
* // do a DELETE request
* // and execute a callback function for each request, as soon as it finishes
* $curl->delete(array(
*
* 'https://www.somewebsite.com' => array(
* 'data_1' => 'value 1',
* 'data_2' => 'value 2',
* ),
*
* // the callback function receives as argument an object with 4 properties
* // (info, header, body and response)
* ), function($result) {
*
* // everything went well at cURL level
* if ($result->response[1] == CURLE_OK) {
*
* // if server responded with code 200 (meaning that everything went well)
* // see https://httpstatus.es/ for a list of possible response codes
* if ($result->info['http_code'] == 200) {
*
* // see all the returned data
* print_r('<pre>');
* print_r($result);
*
* // show the server's response code
* } else trigger_error('Server responded with code ' . $result->info['http_code'], E_USER_ERROR);
*
* // something went wrong
* // ($result still contains all data that could be gathered)
* } else trigger_error('cURL responded with: ' . $result->response[0], E_USER_ERROR);
*
* });
* </code>
*
* @param mixed $urls URL(s) to send the request(s) to.
*
* Read full description of the argument at the {@link post} method.
*
* @param mixed $callback (Optional) Callback function to be called as soon as the request finishes.
*
* Read full description of the argument at the {@link get} method.
*
* @since 1.3.3
*
* @return void
*/
public function delete($urls, $callback = '') {
// normalize URLs
// (transforms every allowed combination to the same type of array)
$urls = $this->_prepare_urls($urls);
// iterate through the list of URLs to process
foreach ($urls as $values)
// add each URL and associated properties to the "_requests" property
$this->_requests[] = array(
'url' => $values['url'],
// merge any custom options with the default ones
'options' =>
(isset($values['options']) ? $values['options'] : array()) +
array(
CURLINFO_HEADER_OUT => 1,
CURLOPT_CUSTOMREQUEST => 'DELETE',
CURLOPT_HEADER => 1,
CURLOPT_NOBODY => 0,
CURLOPT_POST => 0,
CURLOPT_POSTFIELDS => isset($values['data']) ? (is_array($values['data']) ? http_build_query($values['data'], '', '&') : $values['data']) : '',
CURLOPT_BINARYTRANSFER => null,
CURLOPT_HTTPGET => null,
CURLOPT_FILE => null,
),
'callback' => $callback,
// additional arguments to pass to the callback function, if any
'arguments' => array_slice(func_get_args(), 2, null, true),
);
// if we're just queuing requests for now, do not execute the next lines
if ($this->_queue) return;
// if we have to pause between batches of requests, process them sequentially, in batches
if ($this->pause_interval > 0) $this->_process_paused();
// if we don't have to pause between batches of requests, process them all at once
else $this->_process();
}
/**
* Downloads one or more files from one or more URLs, saves the downloaded files to the path specified by the *$path*
* argument, and executes the callback function specified by the *$callback* argument for each and every request,
* as soon as the request finishes.
*
* > If the path you are downloading from refers to a file, the file's original name will be preserved but, if
* you are downloading a file generated by a script (i.e. https://foo.com/bar.php?w=1200&h=800), the downloaded
* file's name will be random generated. Refer to the downloaded file's name in the result's `info` attribute,
* in the `downloaded_filename` section - see the example below.
*
* > If you are downloading multiple files with the same name the later ones will overwrite the previous ones.
*
* Downloads are streamed (bytes downloaded are directly written to disk) removing the unnecessary strain from your
* server of reading files into memory first, and then writing them to disk.
*
* This method will automatically set the following options:
*
* - `CURLINFO_HEADER_OUT` = `TRUE`
* - `CURLOPT_BINARYTRANSFER` = `TRUE`
* - `CURLOPT_HEADER` = `TRUE`
* - `CURLOPT_FILE`
*
* ...and will unset the following options:
*
* - `CURLOPT_CUSTOMREQUEST`
* - `CURLOPT_HTTPGET`
* - `CURLOPT_NOBODY`
* - `CURLOPT_POST`
* - `CURLOPT_POSTFIELDS`
*
* Multiple requests are processed asynchronously, in parallel, and the callback function is called for each and every
* request as soon as the request finishes. The number of parallel requests to be constantly processed, at all times,
* is set through the {@link threads} property. See also {@link pause_interval}.
*
* > Because requests are done asynchronously, when initiating multiple requests at once, these may not finish in
* the order in which they were initiated!
*
* <code>
* // instantiate the class
* $curl = new Zebra_cURL();
*
* // if making requests over HTTPS we need to load a CA bundle
* // so we don't get CURLE_SSL_CACERT response from cURL
* // you can get this bundle from https://curl.se/docs/caextract.html
* $curl->ssl(true, 2, 'path/to/cacert.pem');
*
* // download 2 images from 2 different websites
* // and execute a callback function for each request, as soon as it finishes
* $curl->download(array(
*
* 'https://www.somewebsite.com/images/alpha.jpg',
* 'https://www.otherwebsite.com/images/omega.jpg',
*
* // the callback function receives as argument an object with 4 properties
* // (info, header, body and response)
* ), 'destination/path/', function($result) {
*
* // everything went well at cURL level
* if ($result->response[1] == CURLE_OK) {
*
* // if server responded with code 200 (meaning that everything went well)
* // see https://httpstatus.es/ for a list of possible response codes
* if ($result->info['http_code'] == 200) {
*
* // see all the returned data
* print_r('<pre>');
* print_r($result);
*
* // get the downloaded file's path
* $result->info['downloaded_filename'];
*
* // show the server's response code
* } else trigger_error('Server responded with code ' . $result->info['http_code'], E_USER_ERROR);
*
* // something went wrong
* // ($result still contains all data that could be gathered)
* } else trigger_error('cURL responded with: ' . $result->response[0], E_USER_ERROR);
*
* });
* </code>
*
* @param mixed $urls URL(s) to send the request(s) to.
*
* Can be any of the following:
*
* <code>
* // a string
* $curl->download('https://address.com/file.foo', 'path', 'callback');
*
* // an array, for multiple requests
* $curl->download(array(
* 'https://address1.com/file1.foo',
* 'https://address2.com/file2.bar',
* ), 'path', 'callback');
* </code>
*
* If {@link option() custom options} need to be set for each request, use the
* following format:
*
* <code>
* // this can also be an array of arrays, for multiple requests
* $curl->download(array(
*
* // mandatory!
* 'url' => 'https://address.com/file.foo',
*
* // optional, used to set any cURL option
* // in the same way you would set with the options() method
* 'options' => array(
* CURLOPT_USERAGENT => 'Dummy scraper 1.0',
* ),
*
* ), 'path', 'callback');
* </code>
*
* @param string $path The path to where to save the file(s) to.
*
* *If path is not pointing to a directory or the directory is not writable, the
* library will trigger an error.*
*
* @param mixed $callback (Optional) Callback function to be called as soon as the request finishes.
*
* Read full description of the argument at the {@link get} method.
*
* @return void
*/
public function download($urls, $path, $callback = '') {
// if destination path is not a directory or is not writable, trigger an error message
if (!is_dir($path) || !is_writable($path)) trigger_error('"' . $path . '" is not a valid path or is not writable', E_USER_ERROR);
// normalize URLs
// (transforms every allowed combination to the same type of array)
$urls = $this->_prepare_urls($urls);
// iterate through the list of URLs to process
foreach ($urls as $values)
// add each URL and associated properties to the "_requests" property
$this->_requests[] = array(
'url' => $values['url'],
'path' => rtrim($path, '/\\') . '/',
// merge any custom options with the default ones
'options' =>
(isset($values['options']) ? $values['options'] : array()) +
array(
CURLINFO_HEADER_OUT => 1,
CURLOPT_BINARYTRANSFER => 1,
CURLOPT_HEADER => 0,
CURLOPT_CUSTOMREQUEST => null,
CURLOPT_HTTPGET => null,
CURLOPT_NOBODY => null,
CURLOPT_POST => null,
CURLOPT_POSTFIELDS => null,
),
'callback' => $callback,
// additional arguments to pass to the callback function, if any
'arguments' => array_slice(func_get_args(), 3, null, true),
);
// if we're just queuing requests for now, do not execute the next lines
if ($this->_queue) return;
// if we have to pause between batches of requests, process them sequentially, in batches
if ($this->pause_interval > 0) $this->_process_paused();
// if we don't have to pause between batches of requests, process them all at once
else $this->_process();
}
/**
* Works exactly like the {@link download} method but downloads are made from an FTP server.
*
* Downloads one or more files from an FTP server, to which the connection is made using the given *$username* and
* *$password* arguments, saves the downloaded files (with their original name) to the path specified by the *$path*
* argument, and executes the callback function specified by the *$callback* argument for each and every request,
* as soon as the request finishes.
*
* Downloads are streamed (bytes downloaded are directly written to disk) removing the unnecessary strain from your
* server of reading files into memory first, and then writing them to disk.
*
* This method will automatically set the following options:
*
* - `CURLINFO_HEADER_OUT` = `TRUE`
* - `CURLOPT_BINARYTRANSFER` = `TRUE`
* - `CURLOPT_HEADER` = `TRUE`
* - `CURLOPT_FILE`
*
* ...and will unset the following options:
*
* - `CURLOPT_CUSTOMREQUEST`
* - `CURLOPT_HTTPGET`
* - `CURLOPT_NOBODY`
* - `CURLOPT_POST`
* - `CURLOPT_POSTFIELDS`
*
* > If you are downloading multiple files with the same name the later ones will overwrite the previous ones.
*
* Multiple requests are processed asynchronously, in parallel, and the callback function is called for each and every
* request as soon as the request finishes. The number of parallel requests to be constantly processed, at all times,
* is set through the {@link threads} property. See also {@link pause_interval}.
*
* > Because requests are done asynchronously, when initiating multiple requests at once, these may not finish in
* the order in which they were initiated!
*
* <code>
* // instantiate the class
* $curl = new Zebra_cURL();
*
* // if making requests over HTTPS we need to load a CA bundle
* // so we don't get CURLE_SSL_CACERT response from cURL
* // you can get this bundle from https://curl.se/docs/caextract.html
* $curl->ssl(true, 2, 'path/to/cacert.pem');
*
* // connect to the FTP server using the given credential, download a file to a given location
* // and execute a callback function for each request, as soon as it finishes
* $curl->ftp_download(
*
* 'ftp://somefile.ext',
* 'destination/path',
* 'username',
* 'password',
*
* // the callback function receives as argument an object with 4 properties
* // (info, header, body and response)
* function($result) {
*
* // everything went well at cURL level
* if ($result->response[1] == CURLE_OK) {
*
* // if server responded with code 200 (meaning that everything went well)
* // see https://httpstatus.es/ for a list of possible response codes
* if ($result->info['http_code'] == 200) {
*
* // see all the returned data
* print_r('<pre>');
* print_r($result);
*
* // show the server's response code
* } else trigger_error('Server responded with code ' . $result->info['http_code'], E_USER_ERROR);
*
* // something went wrong
* // ($result still contains all data that could be gathered)
* } else trigger_error('cURL responded with: ' . $result->response[0], E_USER_ERROR);
*
* }
*
* );
* </code>
*
* @param mixed $urls URL(s) to send the request(s) to.
*
* Can be any of the following:
*
* <code>
* // a string
* $curl->ftp_download(
* 'ftp://address.com/file.foo',
* 'destination/path',
* 'username',
* 'password',
* 'callback'
* );
*
* // an array, for multiple requests
* $curl->ftp_download(array(
* 'ftp://address1.com/file1.foo',
* 'ftp://address2.com/file2.bar',
* ), 'destination/path', 'username', 'password', 'callback');
* </code>
*
* If {@link option() custom options} need to be set for each request, use the
* following format:
*
* <code>
* // this can also be an array of arrays, for multiple requests
* $curl->ftp_download(array(
*
* // mandatory!
* 'url' => 'ftp://address.com/file.foo',
*
* // optional, used to set any cURL option
* // in the same way you would set with the options() method
* 'options' => array(
* CURLOPT_USERAGENT => 'Dummy scraper 1.0',
* ),
*
* ), 'destination/path', 'username', 'password', 'callback');
* </code>
*
* Note that in all the examples above, you are downloading files from a single
* FTP server. To make requests to multiple FTP servers, set the `CURLOPT_USERPWD`
* option yourself. The *$username* and *$password* arguments will be overwritten
* by the values set like this.
*
* <code>
* $curl->ftp_download(array(
* array(
* 'url' => 'ftp://address1.com/file1.foo',
* 'options' => array(
* CURLOPT_USERPWD => 'username1:password1',
* ),
* ),
* array(
* 'url' => 'ftp://address2.com/file2.foo',
* 'options' => array(
* CURLOPT_USERPWD => 'username2:password2',
* ),
* ),
* ), 'destination/path', '', '', 'callback');
* </code>
*
* @param string $path The path to where to save the file(s) to.
*
* *If path is not pointing to a directory or is not writable, the library will
* trigger an error.*
*
* @param string $username (Optional) The username to be used to connect to the FTP server (if required).
*
* @param string $password (Optional) The password to be used to connect to the FTP server (if required).
*
* @param mixed $callback (Optional) Callback function to be called as soon as the request finishes.