List of environment system variables PHP

<?php
$system_variables = array(	'PHP_SELF',
						'SCRIPT_NAME',
						'SERVER_NAME',
						'SERVER_SOFTWARE',
						'SERVER_PROTOCOL',
						'SERVER_PORT',
						'HTTP_USER_AGENT',
						'REMOTE_ADDR'
					);

foreach( $system_variables as $sv )
echo $sv . ": " . $_SERVER[$sv] . "<br />";
?>

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