[PHP] Strip Personal Information preg_replace

$string = '111-11-1111 111111111 1111-1111-1111-1111 1111111111111111';
$patterns = array();
$patterns[0] = '#\b[0-9]{4}-[0-9]{4}-[0-9]{4}-[0-9]{4}\b#';
$patterns[1] = '#\b[0-9]{16}\b#';
$patterns[2] = '#\b[0-9]{3}-[0-9]{2}-[0-9]{4}\b#';
$patterns[3] = '#\b[0-9]{9}\b#';
$replacements = array();
$replacements[0] = 'redacted:creditcard';
$replacements[1] = 'redacted:creditcard';
$replacements[2] = 'redacted:socialsecuritynumber';
$replacements[3] = 'redacted:socialsecuritynumber';
echo preg_replace($patterns, $replacements, $string);