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examples.xml
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examples.xml
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: f0e6ac0428979cc3474c7087513904c58bc22c87 Maintainer: mowangjuanzi Status: ready -->
<chapter xml:id="stream.examples">
&reftitle.examples;
<para>
<example>
<title>使用 <function>file_get_contents</function> 从多个来源检索数据</title>
<programlisting role="php">
<![CDATA[
<?php
/* 从 /home/bar 读取本地文件 */
$localfile = file_get_contents("/home/bar/foo.txt");
/* 与上面相同,显式命名 FILE 方案 */
$localfile = file_get_contents("file:///home/bar/foo.txt");
/* 使用 HTTP 从 www.example.com 读取远程文件 */
$httpfile = file_get_contents("http://www.example.com/foo.txt");
/* 使用 HTTPS 从 www.example.com 读取远程文件 */
$httpsfile = file_get_contents("https://www.example.com/foo.txt");
/* 使用 FTP 从 ftp.example.com 读取远程文件 */
$ftpfile = file_get_contents("ftp://user:pass@ftp.example.com/foo.txt");
/* 使用 FTPS 从 ftp.example.com 读取远程文件 */
$ftpsfile = file_get_contents("ftps://user:pass@ftp.example.com/foo.txt");
?>
]]>
</programlisting>
</example>
</para>
<para>
<example>
<title>向 https 服务器发出 POST 请求</title>
<programlisting role="php">
<![CDATA[
<?php
/* 发送 POST 请求到 https://secure.example.com/form_action.php
* 包含了名为 "foo" 和 "bar" 及其虚拟值的表单元素
*/
$sock = fsockopen("ssl://secure.example.com", 443, $errno, $errstr, 30);
if (!$sock) die("$errstr ($errno)\n");
$data = "foo=" . urlencode("Value for Foo") . "&bar=" . urlencode("Value for Bar");
fwrite($sock, "POST /form_action.php HTTP/1.0\r\n");
fwrite($sock, "Host: secure.example.com\r\n");
fwrite($sock, "Content-type: application/x-www-form-urlencoded\r\n");
fwrite($sock, "Content-length: " . strlen($data) . "\r\n");
fwrite($sock, "Accept: */*\r\n");
fwrite($sock, "\r\n");
fwrite($sock, $data);
$headers = "";
while ($str = trim(fgets($sock, 4096)))
$headers .= "$str\n";
echo "\n";
$body = "";
while (!feof($sock))
$body .= fgets($sock, 4096);
fclose($sock);
?>
]]>
</programlisting>
</example>
</para>
<para>
<example>
<title>将数据写入压缩文件</title>
<programlisting role="php">
<![CDATA[
<?php
/* 创建一个包含任意字符串的压缩文件
* 文件可以使用 compress.zlib 流读取,
* 也可以使用 “gzip -d foo-bar.txt.gz” 从命令行解压缩文件
*/
$fp = fopen("compress.zlib://foo-bar.txt.gz", "wb");
if (!$fp) die("Unable to create file.");
fwrite($fp, "This is a test.\n");
fclose($fp);
?>
]]>
</programlisting>
</example>
</para>
<section xml:id="stream.streamwrapper.example-1">
<title>示例类注册为流封装器</title>
<para>
下面的示例实现了一个 var:// 协议处理程序,允许使用诸如 <function>fread</function>
之类的标准文件系统流函数对有名称的全局变量进行读写访问。下面实现的 var://
协议,指定的 URL “var://foo” 将从 $GLOBALS["foo"] 读写数据。
</para>
<para>
<example>
<title>用于读写全局变量的流</title>
<programlisting role="php">
<![CDATA[
<?php
class VariableStream {
var $position;
var $varname;
function stream_open($path, $mode, $options, &$opened_path)
{
$url = parse_url($path);
$this->varname = $url["host"];
$this->position = 0;
return true;
}
function stream_read($count)
{
$ret = substr($GLOBALS[$this->varname], $this->position, $count);
$this->position += strlen($ret);
return $ret;
}
function stream_write($data)
{
$left = substr($GLOBALS[$this->varname], 0, $this->position);
$right = substr($GLOBALS[$this->varname], $this->position + strlen($data));
$GLOBALS[$this->varname] = $left . $data . $right;
$this->position += strlen($data);
return strlen($data);
}
function stream_tell()
{
return $this->position;
}
function stream_eof()
{
return $this->position >= strlen($GLOBALS[$this->varname]);
}
function stream_seek($offset, $whence)
{
switch ($whence) {
case SEEK_SET:
if ($offset < strlen($GLOBALS[$this->varname]) && $offset >= 0) {
$this->position = $offset;
return true;
} else {
return false;
}
break;
case SEEK_CUR:
if ($offset >= 0) {
$this->position += $offset;
return true;
} else {
return false;
}
break;
case SEEK_END:
if (strlen($GLOBALS[$this->varname]) + $offset >= 0) {
$this->position = strlen($GLOBALS[$this->varname]) + $offset;
return true;
} else {
return false;
}
break;
default:
return false;
}
}
function stream_metadata($path, $option, $var)
{
if($option == STREAM_META_TOUCH) {
$url = parse_url($path);
$varname = $url["host"];
if(!isset($GLOBALS[$varname])) {
$GLOBALS[$varname] = '';
}
return true;
}
return false;
}
}
stream_wrapper_register("var", "VariableStream")
or die("Failed to register protocol");
$myvar = "";
$fp = fopen("var://myvar", "r+");
fwrite($fp, "line1\n");
fwrite($fp, "line2\n");
fwrite($fp, "line3\n");
rewind($fp);
while (!feof($fp)) {
echo fgets($fp);
}
fclose($fp);
var_dump($myvar);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
line1
line2
line3
string(18) "line1
line2
line3
"
]]>
</screen>
</example>
</para>
</section>
</chapter>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->