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<?php function validatePrintf($format, $arguments) { if (preg_match_all("~%(?:(\d+)[$])?[-+]?(?:[ 0]|['].)?(?:[-]?\d+)?(?:[.]\d+)?[%bcdeEufFgGosxX]~", $format, $expected) > 0) { return (count((array) $arguments) >= intval(max($expected[1]))); } return false; } var_dump(validatePrintf('The %2$s contains %1$d monkeys', array(5, 'tree')));
Output for 4.3.0 - 7.1.0
bool(true)