Opérateur Ternaire
<?php
// Example usage for: Ternary Operator
$action = (empty($_POST['action'])) ? 'default' : $_POST['action'];
// The above is identical to this if/else statement
if (empty($_POST['action'])) {
$action = 'default';
} else {
$action = $_POST['action'];
}?>
Pour mettre avec isset :
<?php
$datas = (isset ($_POST["source"])) ? $_POST["source"] : "";
Issu de http://fr2.php.net/manual/en/language.operators.comparison.php
