#Superglobal
$_SERVER Superglobal
Superglobals were introduced in PHP 4.1.0, and are built-in variables
that are always available in all scopes. Basically system variables.
https://www.w3schools.com/php/php_superglobals.asp
Note: $_SERVER Superglobal -- tells a little about the server and
the client
==============
#Example index.php
<?php include 'server-info.php';?>
<!DOCTYPE html>
<html>
<head>
<title>System Info</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
</head>
<body>
<div class ="container">
<h1>Server & File Info</h1>
<?php if($server): ?>
<ul class="list-group">
<?php foreach($server as $key => $value): ?>
<li class="list-group-item">
<strong><?php echo $key; ?>: </strong>
<?php echo $value; ?>
</li>
<?php endforeach; ?>
</ul>
<?php endif; ?>
<h1>Client Info</h1>
<?php if($client): ?>
<ul class="list-group">
<?php foreach($client as $key1 => $value1): ?>
<li class="list-group-item">
<strong><?php echo $key1; ?>: </strong>
<?php echo $value1; ?>
</li>
<?php endforeach; ?>
</ul>
<?php endif; ?>
</body>
</html>
==================
#Example server-info.php
<?php
# $_SERVER SUPERGLOBAL
//Create Server Array
$server =[
'Host Server Name' => $_SERVER['SERVER_NAME'],
'Http Host' => $_SERVER['HTTP_HOST'],
'Server Software' => $_SERVER['SERVER_SOFTWARE'],
'Document Root' => $_SERVER['DOCUMENT_ROOT'],
'Current Page' => $_SERVER['PHP_SELF'],
'Script Name' => $_SERVER['SCRIPT_NAME'],
'Absloute Path' => $_SERVER['SCRIPT_FILENAME']
];
echo $server['Host Server Name'];
echo $server['Http Host'];
echo $server['Server Software'];
echo $server['Document Root'];
echo $server['Current Page'];
echo $server['Script Name'];
echo '<br>';
//also can show it all
print_r($server);
//Creat Client Array
$client = [
'Client System Info' => $_SERVER['HTTP_USER_AGENT'],
'Client IP' => $_SERVER['REMOTE_ADDR'],
'Remote Port' => $_SERVER['REMOTE_PORT']
];
echo '<br>';
echo '<br>';
print_r($client);
?><?php
$x = 75;
$y = 25;
function addition() {
$GLOBALS['z'] = $GLOBALS['x'] + $GLOBALS['y'];
}
addition();
echo $z;
?>