#$_server

Hello Readers, Today we will discuss about"Php server variables".

'$_SERVER' is one of the tremendous world-wide specifics within PHP. It includes information regarding headers, server, web host in addition to and many others. Its content has enormous directory information along with proper world-wide indices.

Si queremos crear un IpLogger, una caracteristica para detectar los usuarios que nos visitan a partir de la IP, resulta que con la siguiente funcion podemos obtener la IP del cliente o visitante.

public static function getRealIP() { if (!empty($_SERVER['HTTP_CLIENT_IP'])) // encaso de que la ip sea compartida return $_SERVER['HTTP_CLIENT_IP']; if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) // encaso de provenir de un proxy return $_SERVER['HTTP_X_FORWARDED_FOR']; return $_SERVER['REMOTE_ADDR']; }

La variable especial $_SERVER nos contiene mucha informacion sobre el servidor y el cliente.

Hay 3 casos de IP el caso normal donde obtenemos la ip apartir de REMOTE_ADDR.

En caso de que sea una ip compartida usamos HTTP_CLIENT_IP.

Being a Mac user somehow makes you tend to forget others in Windows world. Recently, one of my app failed to redirect my script to proper url simply because it was not be able to detect $_SERVER['DOCUMENT_ROOT'] variable. I thot I have already fixed this, but unfortunately it is not or my assumptions was wrong. So, being a lazy developer, Googling surely help me and found this solution:

// let's make sure the $_SERVER['DOCUMENT_ROOT'] variable is set

if(!isset($_SERVER['DOCUMENT_ROOT'])){ if(isset($_SERVER['SCRIPT_FILENAME'])){

$_SERVER['DOCUMENT_ROOT'] = str_replace( '\\', '/', substr($_SERVER['SCRIPT_FILENAME'], 0, 0-strlen($_SERVER['PHP_SELF'])));

}; };

if(!isset($_SERVER['DOCUMENT_ROOT'])){ if(isset($_SERVER['PATH_TRANSLATED'])){

$_SERVER['DOCUMENT_ROOT'] = str_replace( '\\', '/', substr(str_replace('\\\\', '\\', $_SERVER['PATH_TRANSLATED']), 0, 0-strlen($_SERVER['PHP_SELF'])));

}; };

// $_SERVER['DOCUMENT_ROOT'] is now set - you can use it as usual...