- var_dump: documentation ( source)
- preg_match: documentation ( source)
<?php
echo "\n** warning about bad pattern AND bad parameter: **\n";
var_dump(preg_match('bad pattern', null));
echo "\n** warning about bad pattern only: **\n";
var_dump(preg_match('bad pattern', ''));
echo "\n** suppressed warnings: **\n";
var_dump(@preg_match('bad pattern', ''));