3v4l.org

run code in 300+ PHP versions simultaneously
<?php $_POST = [ 'wind_1' => 'hk', 'hamburger_66' => 'foo', 'wind_2' => 'pop', 'wind_25' => 'another' ]; foreach ($_POST as $k => $v) { if (strpos($k, 'wind_') === 0) { $key = $k; } } echo filter_var($key, FILTER_SANITIZE_NUMBER_INT);
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
25
preferences:
73.48 ms | 407 KiB | 5 Q