Fonction de récupuration d'ip

Cette fonction de récupération d'ip est plus efficace que bien des fonctions que l'on peut trouver. Elle est tirée du fameux script PhpMyAdmin...

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R@f

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Enregistré le 08 Sept 2007

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<?php
/******************************************************************************/
/*                                                                            */
/*                       __        ____                                       */
/*                 ___  / /  ___  / __/__  __ _____________ ___               */
/*                / _ \/ _ \/ _ \_\ \/ _ \/ // / __/ __/ -_|_-<               */
/*               / .__/_//_/ .__/___/\___/\_,_/_/  \__/\__/___/               */
/*              /_/       /_/                                                 */
/*                                                                            */
/*                                                                            */
/******************************************************************************/
/*                                                                            */
/* Titre          : Fonction de récupuration d'ip                             */
/*                                                                            */
/* URL            : http://www.phpsources.org/scripts301-PHP.htm              */
/* Auteur         : R@f                                                       */
/* Date édition   : 08 Sept 2007                                              */
/*                                                                            */
/******************************************************************************/

function PMA_getIp(  )
{
    global $REMOTE_ADDR;
    global $HTTP_X_FORWARDED_FOR, $HTTP_X_FORWARDED, $HTTP_FORWARDED_FOR, 
$HTTP_FORWARDED;
    global $HTTP_VIA, $HTTP_X_COMING_FROM, $HTTP_COMING_FROM;
    
    // Get some server/environment variables values
    if( empty( $REMOTE_ADDR ) && PMA_getenv( 'REMOTE_ADDR' ) )
        $REMOTE_ADDR = PMA_getenv(  'REMOTE_ADDR'  );
    if ( empty( $HTTP_X_FORWARDED_FOR ) && PMA_getenv( 'HTTP_X_FORWARDED_FOR' ) 
)
        $HTTP_X_FORWARDED_FOR = PMA_getenv( 'HTTP_X_FORWARDED_FOR' );
    if( empty( $HTTP_X_FORWARDED ) && PMA_getenv( 'HTTP_X_FORWARDED' ) )
        $HTTP_X_FORWARDED = PMA_getenv( 'HTTP_X_FORWARDED' );
    if ( empty( $HTTP_FORWARDED_FOR ) && PMA_getenv( 'HTTP_FORWARDED_FOR' ) )
        $HTTP_FORWARDED_FOR = PMA_getenv( 'HTTP_FORWARDED_FOR' );
    if ( empty( $HTTP_FORWARDED ) && PMA_getenv( 'HTTP_FORWARDED' ) )
        $HTTP_FORWARDED = PMA_getenv( 'HTTP_FORWARDED' );
    if ( empty( $HTTP_VIA ) && PMA_getenv( 'HTTP_VIA' ) )
        $HTTP_VIA = PMA_getenv( 'HTTP_VIA' );
    if ( empty( $HTTP_X_COMING_FROM ) && PMA_getenv( 'HTTP_X_COMING_FROM' ) )
        $HTTP_X_COMING_FROM = PMA_getenv( 'HTTP_X_COMING_FROM' );
    if ( empty( $HTTP_COMING_FROM ) && PMA_getenv( 'HTTP_COMING_FROM' ) )
        $HTTP_COMING_FROM = PMA_getenv( 'HTTP_COMING_FROM' );

    // Gets the default ip sent by the user
    if ( !empty( $REMOTE_ADDR ) )
        $direct_ip = $REMOTE_ADDR;
        
    // Gets the proxy ip sent by the user
    $proxy_ip = '';
    if ( !empty( $HTTP_X_FORWARDED_FOR ) )
        $proxy_ip = $HTTP_X_FORWARDED_FOR;
    elseif ( !empty( $HTTP_X_FORWARDED ) )
        $proxy_ip = $HTTP_X_FORWARDED;
    elseif ( !empty( $HTTP_FORWARDED_FOR ) )
        $proxy_ip = $HTTP_FORWARDED_FOR;
    elseif ( !empty( $HTTP_FORWARDED ) )
        $proxy_ip = $HTTP_FORWARDED;
    elseif ( !empty( $HTTP_VIA ) )
        $proxy_ip = $HTTP_VIA;
    elseif ( !empty( $HTTP_X_COMING_FROM ) )
        $proxy_ip = $HTTP_X_COMING_FROM;
    elseif ( !empty( $HTTP_COMING_FROM ) )
        $proxy_ip = $HTTP_COMING_FROM;
    // end if... elseif...

    // Returns the true IP if it has been found, else FALSE
    if ( empty( $proxy_ip ) )
        return $direct_ip; // True IP without proxy
    else
    {
        $is_ip = preg_match( '|^( [0-9]{1,3}\. ){3,3}[0-9]{1,3}|', $proxy_ip, 
$regs );
        if ( $is_ip && ( count( $regs ) >  ) )
            return $regs[]; // True IP behind a proxy
        else
        {
            // Can't define IP: there is a proxy but we don't have
            // information about the true IP
            return FALSE;
        }
    } // end if... else...
} // end of the 'PMA_getIp(  )' function

/**
* trys to find the value for the given environment vriable name
*
* searchs in $_SERVER, $_ENV than trys getenv(  ) and apache_getenv(  )
* in this order
*
* @param string $var_name variable name
* @return string value of $var or empty string
*/
function PMA_getenv( $var_name ) 
{
    if ( isset( $_SERVER[$var_name] ) )
        return $_SERVER[$var_name];
    elseif ( isset( $_ENV[$var_name] ) )
        return $_ENV[$var_name];
    elseif ( getenv( $var_name ) )
        return getenv( $var_name );
    elseif ( function_exists( 'apache_getenv' ) && apache_getenv( $var_name, 
true ) )
        return apache_getenv( $var_name, true );
    
    return '';
}
?>