Getting started with photoshop PHP learning notes [Predefined array super global array]

Copy code The code is as follows:

/* Predefined array:
* Automatic global variable---super global array
*
* 1. Contains data from WEB server, client, Running environment and user input data
* 2. These arrays are special
* 3. They are automatically effective globally and can be used directly
* 4. Users cannot customize these arrays, but the operation methods of these arrays are different from their own The defined arrays operate in the same way
* 5. These arrays can be used directly in the function
*
* $_GET //Variables submitted to the script via URL request
* $_POST //Variables submitted to the script via the HTTP POST method
* $_REQUEST //Variables submitted to the script via GET, POST and COOKIE mechanisms
* $_FILES //Variables submitted to the script via http post method file upload
* $_COOKIE
* $_SESSION
* $_ENV // Variables submitted to the script by the execution environment
* $_SERVER //Variables are set by the WEB server, or directly associated with the execution environment of the current script
* $GLOBALS //As long as the variables that are valid for the current script are here, the array The key name is the name of the global script
*
*
*/
//Super global array can be called directly inside the function
$arr=array(10,20);//General array
$_GET=array(50,90 );//Super global array
function demo(){
global $arr;//To call global variables, you must first include
print_r($arr);
print_r($_GET);//Directly calling super global array does not need to include
}
?>

//Use the passed value directly as a variable, useful when register_global=on in the php.ini configuration file.
echo $username."
";
echo $email."
";
echo $page."
";
//The most stable value method
echo $_GET[ "username"]."
";
echo $_GET["email"]."
";
echo $_GET["page"]."
";
?>
this is a $_GET test

username:< input type="text" name="uname" />

password:

print_r($_GET);//Cannot receive
print_r($_POST);// Only in this way can we receive
?>
//Use of $_ENV
echo'

'; <br>print_r($_ENV); <br>echo'

';
//Display The current environment
// can also be traversed individually
?>
//Use the $GLOBALS super global array to call global variables inside the function
$a=100;
$b=200;
$c=300 ;
function demo()
{
//Directly call global variables
echo $GLOBALS["a"]."
";
echo $GLOBLS["b"]."
";
echo $GLOABLS["c"]."
";
}
?>

The above introduces the introductory learning of photoshop PHP learning notes [predefined array super global array], including the content of introductory learning of photoshop. I hope it will be helpful to friends who are interested in PHP tutorials.