3v4l.org

run code in 300+ PHP versions simultaneously
<?php $_POST=['submit'=>'','firstname'=>'legit','lastname'=>'n0tl3g!t']; $errors=[]; foreach($_POST as $key=>$value){ if(in_array($key,['firstname','lastname']) && !ctype_alpha($value)){ $errors[]="$key field contains invalid value: $value"; } } var_export($errors);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array ( 0 => 'lastname field contains invalid value: n0tl3g!t', )
preferences:
106.05 ms | 1994 KiB | 4 Q