Bug #68551 [Nab]: filter_var return false for (float) $integer if strlen($integer) > ini_get('prec

Edit report at https://bugs.php.net/bug.php?id=68551&edit=1 ID: 68551 User updated by: frederic dot hardy at mageekbox dot net Reported by: frederic dot hardy at mageekbox dot net Summary: filter_var return false for (float) $integer if strlen($integer) > ini_get('prec Status: Not a bug Type: Bug Package: Filter related Operating System: Linux/OSX PHP Version: 5.6.3 Block user comment: N Private report: N New Comment: Moreover, to be clear: <?php ini_set('precision', 2); $i = 100; var_dump(filter_var((float) $i, FILTER_VALIDATE_INT)); // bool(false) var_dump((float) $i == $i); // bool(true) ?> So, how a float can be equal to an integer if it's not an integer ? Previous Comments: ------------------------------------------------------------------------ [2014-12-10 13:33:41] frederic dot hardy at mageekbox dot net Pierre just say me on IRC to add this script to illustrate the problem: <?php ini_set('precision', 2); var_dump(filter_var(1.0, FILTER_VALIDATE_INT)); // int(1) var_dump(filter_var(100.0, FILTER_VALIDATE_INT)); // bool(false) ?> So, filter_var(1.0, FILTER_VALIDATE_INT) should return false, as filter_var(100.0, FILTER_VALIDATE_INT), or filter_var(100.0, FILTER_VALIDATE_INT) should return int(100)... ------------------------------------------------------------------------ [2014-12-05 18:58:18] frederic dot hardy at mageekbox dot net So, filter_validate(1., FILTER_VALIDATE_INT) return (int) 1, but filter_validate(123456789123456., FILTER_VALIDATE_INT) return false, and it's not a bug. OK. All is right, we are in the PHP world! ------------------------------------------------------------------------ [2014-12-05 14:44:38] ajf@php.net (Though I agree it's pretty weird behaviour, FILTER_VALIDATE_INT could seriously be improved. Still, it's not actually a bug.) ------------------------------------------------------------------------ [2014-12-05 14:43:45] ajf@php.net Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php filter_var's FILTER_VALIDATE_INT always casts its argument to a string before conversion, and exponents and decimal points are never accepted, this is no exception. ------------------------------------------------------------------------ [2014-12-05 12:54:16] frederic dot hardy at mageekbox dot net Description: ------------ filter_var() with option FILTER_VALIDATE_INT return false if its argument is an integer casted to float with strlen($integer) > ini_get('precision'). Test script: --------------- <?php ini_set('precision', 14); // PHP default $i = 12345678912345; // strlen($i) == 14 var_dump(strlen($i)); var_dump(filter_var((float) $i, FILTER_VALIDATE_INT)); // $i var_dump((float) $i == $i); // true $i = 123456789123456; // strlen($i) = 15 var_dump(strlen($i)); var_dump(filter_var((float) $i, FILTER_VALIDATE_INT)); // false instead of $i var_dump((float) $i == $i); // true Expected result: ---------------- int(14) int(12345678912345) bool(true) int(15) bool(123456789123456) bool(true) Actual result: -------------- int(14) int(12345678912345) bool(true) int(15) bool(false) bool(true) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=68551&edit=1