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PHP help
PHP: Hypertext Preprocessor.
version - PHP 5.6.16
PHP is a server side scripting language that is embedded in HTML. It is used to manage dynamic content, databases, session tracking, even build entire e-commerce sites.
- hello world
<html>
<head>
<title>Hello World</title>
</head>
<body>
<?php echo "Hello, World!";?>
</body>
</html>- PHP Markup tags
<?php PHP code goes here?>
<? php code goes here ?>
<script language="php"> PHP code goes here</script>The PHP configuration file, php.ini, is the final and most immediate way to affect PHP's functionality. The php.ini file is read each time PHP is initialized.
- Canonical PHP tags
<?php...?>- Short-open tags
<?...?>Note - this tag we need to enable from php.ini file.
- Comment
<?
# This is a comment, and
# This is the second line of the comment
// This is a comment too. Each style comments only
print "An example with single line comments";
?>
- Variable
$msg = "john";
print "Welcome $msg";
- Integer
$int_var = 12345;
- Double
$many = 2.2888800;
-
Boolean TRUE or FALSE
-
NULL
$var = NULL;
- String
<?php
define("MINSIZE", 50);
echo MINSIZE;
echo constant("MINSIZE"); // same thing as the previous line
?><?php
/* First method to create array. */
$numbers = array( 1, 2, 3, 4, 5);
foreach( $numbers as $value )
{
echo "Value is $value <br />";
}
/* Second method to create array. */
$numbers[0] = "one";
$numbers[1] = "two";
$numbers[2] = "three";
$numbers[3] = "four";
$numbers[4] = "five";
foreach( $numbers as $value )
{
echo "Value is $value <br />";
}
?><?php
/* First method to associate create array. */
$salaries = array("mohammad" => 2000, "qadir" => 1000, "zara" => 500);
$salaries['mohammad'] = "high";
?> # Get - http://www.test.com/index.htm?name1=value1&name2=value2
# Get value
$name = $_GET["name"];
# Get post value
$name = $_POST["name"]$_REQUEST variable contains the contents of both $_GET, $_POST, and $_COOKIE.
<?php
if( $_REQUEST["name"] || $_REQUEST["age"] )
{
echo "Welcome ". $_REQUEST['name']. "<br />";
echo "You are ". $_REQUEST['age']. " years old.";
exit();
}
?>
The include() function takes all the text in a specified file and copies it into the file that uses the include function.
<?php
<?php include("menu.php"); ?>
?>So there is no difference in require() and include() except require() function generates a fatal error and halt the execution of the script if there is any problem.
<?php
/* Defining a PHP Function */
function writeMessage($num1)
{
echo "You are really a nice person, Have a nice time!";
}
/* Calling a PHP Function */
writeMessage(123);
#passing argument by reference
function test(&$num)
{
$num += 5
}
$n =5;
test($n);
# setting default value to function
function test2( $num = NULL)
{
}
# Dynamic function call
$fun_holder = "test2";
$fun_holder();
?>
A session creates a file in a temporary directory on the server where registered session variables and their values are stored. The location of the temporary file is determined by a setting in the php.ini file called session.save_path.
<?php
session_start();
$_SESSSION['counter'] = "some value";
?>