Edit report at http://bugs.php.net/bug.php?id=52867&edit=1
ID: 52867 Updated by: il...@php.net Reported by: jason at linuxbox dot com Summary: array_intersect_ukey does not check all keys -Status: Open +Status: Bogus Type: Bug Package: Arrays related Operating System: Linux PHP Version: 5.3.3 Block user comment: N Private report: N New Comment: 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 Previous Comments: ------------------------------------------------------------------------ [2010-10-13 04:17:05] uramihsayibok at gmail dot com Not a bug. The manual page for array_intersect_ukey says >It must return an integer less than, equal to, or greater than zero if the >first key is considered to be respectively less than, equal to, or greater than >the second. Your callback does not do that and by violating the postcondition you get undefined behavior. function func($key1, $key2) { // equivalent to 'return strcmp($key1, $key2);' if ($key1 == $key2) { return 0; } else if ($key1 < $key2) { return -1; } else /* if ($key1 > $key2) */ { return 1; } } ------------------------------------------------------------------------ [2010-09-17 04:18:19] jason at linuxbox dot com Description: ------------ The array_intersect_ukey() function appears to have an invalid algorithm for iterating over array keys to be passed to the user function. A simple test case that implements the same behavior as array_intersect_key() illustrates the bug. Test script: --------------- <?php function func($key1, $key2) { if ($key1 == $key2) { return 0; } return 1; } $all = array('cat' => 'brown', 'dog' => 'yellow', 'mouse' => 'grey', 'horse' => 'white' ); $keep = array('dog' => 1, 'horse' => 1); // Output of the following should be identical print_r(array_intersect_key($all, $keep)); print_r(array_intersect_ukey($all, $keep, 'func')); ?> Expected result: ---------------- Array ( [dog] => yellow [horse] => white ) Array ( [dog] => yellow [horse] => white ) Actual result: -------------- Array ( [dog] => yellow [horse] => white ) Array ( ) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=52867&edit=1
