Edit report at https://bugs.php.net/bug.php?id=62115&edit=1
ID: 62115 Updated by: maar...@php.net Reported by: patttern at gmail dot com Summary: Issue with method array_diff_assoc -Status: Open +Status: Not a bug Type: Bug Package: Arrays related Operating System: All PHP Version: 5.4.3 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 See the answer by arjen at react dot com. The array_diff* methods aren't recursive. So you probably won't want to use them for multidimensional arrays, and thus it's an improvement that >= 5.4.0 warns you. Previous Comments: ------------------------------------------------------------------------ [2012-05-23 13:38:56] arjen at react dot com http://nl3.php.net/array_diff_assoc "Two values from key => value pairs are considered equal only if (string) $elem1 === (string) $elem2 . In other words a strict check takes place so the string representations must be the same." and "Note: This function only checks one dimension of a n-dimensional array. Of course you can check deeper dimensions by using, for example, array_diff_assoc($array1[0], $array2[0]);." So values are casted to string for comparision. The array-elements are casted to string, which results in "array". The following example returns no difference between the two arrays, while this is clearly not the case: http://3v4l.org/1LX4W#v540 Without notices, both arrays would look the same. Notices are generated since 5.4.0, which is a good solution IMO. ------------------------------------------------------------------------ [2012-05-23 05:29:56] patttern at gmail dot com Description: ------------ While executing method array_diff_assoc error appears "Notice: Array to string conversion". The output of script: array(2) { ["one"]=> array(2) { ["param1"]=> string(23) "First Parameter for One" ["param2"]=> string(24) "Second Parameter for One" } ["two"]=> array(2) { ["param1"]=> string(23) "First Parameter for Two" ["param2"]=> string(24) "Second Parameter for Two" } } string(3) "two" array(2) { ["param1"]=> string(23) "First Parameter for Two" ["param2"]=> string(24) "Second Parameter for Two" } array(1) { ["two"]=> array(2) { ["param1"]=> string(23) "First Parameter for Two" ["param2"]=> string(24) "Second Parameter for Two" } } Notice: Array to string conversion in /usr/web/data/test_array_diff.php on line 14 Notice: Array to string conversion in /usr/web/data/test_array_diff.php on line 14 array(1) { ["one"]=> array(2) { ["param1"]=> string(23) "First Parameter for One" ["param2"]=> string(24) "Second Parameter for One" } } What is wrong? Test script: --------------- <?php $source_packages = array( 'one' => array ('param1' => 'First Parameter for One', 'param2' => 'Second Parameter for One'), 'two' => array ('param1' => 'First Parameter for Two', 'param2' => 'Second Parameter for Two') ); $packages_from = $source_packages; var_dump($packages_from); echo "<br />\n"; $package_key = 'two'; var_dump($package_key); echo "<br />\n"; $package_value = $source_packages[$package_key]; var_dump($package_value); echo "<br />\n"; $packages_to = array($package_key => $package_value); var_dump($packages_to); echo "<br />\n"; $result_packages = array_diff_assoc($packages_from, $packages_to); var_dump($result_packages); echo "<br />\n"; ?> ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=62115&edit=1
