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<?php function validatePrintf($format, $arguments) { if (preg_match_all("~%(?:(\d+)[$])?[-+]?(?:[ 0]|['].)?(?:[-]?\d+)?(?:[.]\d+)?[%bcdeEufFgGosxX]~", $format, $expected) > 0) { return $expected; return (count((array) $arguments) >= intval(max($expected[1]))); } return false; } var_dump(validatePrintf('The %2$s contains %d monkeys', array(5, 'tree')));
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> array(2) { [0]=> string(4) "%2$s" [1]=> string(2) "%d" } [1]=> array(2) { [0]=> string(1) "2" [1]=> string(0) "" } }

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