note 106319 added to function.in-array

Loose checking returns some crazy, counter-intuitive results when used with certain arrays. It is completely correct behaviour, due to PHP's leniency on variable types, but in "real-life" is almost useless. The solution is to use the strict checking option. <?php // Example array $array = array( 'egg' => true, 'cheese' => false, 'hair' => 765, 'goblins' => null, 'ogres' => 'no ogres allowed in this array' ); // Loose checking -- return values are in comments // First three make sense, last four do not in_array(null, $array); // true in_array(false, $array); // true in_array(765, $array); // true in_array(763, $array); // true in_array('egg', $array); // true in_array('hhh', $array); // true in_array(array(), $array); // true // Strict checking in_array(null, $array, true); // true in_array(false, $array, true); // true in_array(765, $array, true); // true in_array(763, $array, true); // false in_array('egg', $array, true); // false in_array('hhh', $array, true); // false in_array(array(), $array, true); // false ?> ---- Server IP: 87.124.126.135 Probable Submitter: 88.96.237.202 (proxied: 88.96.237.202) ---- Manual Page -- http://www.php.net/manual/en/function.in-array.php Edit -- https://master.php.net/note/edit/106319 Del: integrated -- https://master.php.net/note/delete/106319/integrated Del: useless -- https://master.php.net/note/delete/106319/useless Del: bad code -- https://master.php.net/note/delete/106319/bad+code Del: spam -- https://master.php.net/note/delete/106319/spam Del: non-english -- https://master.php.net/note/delete/106319/non-english Del: in docs -- https://master.php.net/note/delete/106319/in+docs Del: other reasons-- https://master.php.net/note/delete/106319 Reject -- https://master.php.net/note/reject/106319 Search -- https://master.php.net/manage/user-notes.php