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as

Type:
    Mot-clé à l'intérieur de l'instruction foreach

Exemple:
    foreach ([1,2,3] as $v) {
        echo $v;
    }
    foreach ([1,2,3] as $key => $v) {
        echo $v;
    }
    foreach ([1,2,3] as &v) {
        echo $v;
    }

Liens:
    php.net/manual/en/control-structures.foreach.php