Edit report at http://bugs.php.net/bug.php?id=53724&edit=1
ID: 53724 Comment by: tbrasta at gmail dot com Reported by: lukas dot starecek at centrum dot cz Summary: array_diff like methods compares false as identity and true as equal Status: Open Type: Bug Package: Arrays related Operating System: Irrelevant PHP Version: 5.3.5 Block user comment: N Private report: N New Comment: This is not a bug. The function is operating exactly as stated in the documentation, i.e. casted to string values are compared. Since (string) 0 = "0", (string) false = "" and (string) "0" = "0" but "0" !== "", you get the result as it should be. Previous Comments: ------------------------------------------------------------------------ [2011-01-12 14:27:34] lukas dot starecek at centrum dot cz A little mistake, '' behaves as same with false, so problem is only in comparing 0 and '0' (and maybee some other variables I did not used). ------------------------------------------------------------------------ [2011-01-12 14:16:39] lukas dot starecek at centrum dot cz Description: ------------ array_diff functions compares boolean false as identity (operator "===") and boolean true as equal (operator "==") so behaves inconsistently. It should compare all values in same way and in my opinion it should compare as equals ("==") or have argument (or another mechanism) how to set whether compare by equal or identity. As example I use array_diff_assoc but I think it will probably behave simmilary with another array realted functions (array_diff%, array_intersect%). In expected result I suppose comparing as equal (operator '=='). In example you can see, that array_diff_assoc behaves in such way that 0 or '0' or '' is not same as false, but 1 or '1' is same as true. So false is compared like '===' and true is compared like '=='. Because 0 is same as '0' and 1 is same as '1' I suppose, that this problem is only for boolean false value. Test script: --------------- $arr1 = array('a' => 0, 'b' => 1, 'c' => '0', 'd' => '1', 'e' => '', 'f' => false, 'g' => true, 'h' => 0, 'i' => 1); $arr2 = array('a' => false, 'b' => true, 'c' => false, 'd' => true, 'e' => false, 'f' => false, 'g' => true, 'h' => '0', 'i' => '1'); var_dump(array_diff_assoc($arr1, $arr2)); Expected result: ---------------- array(0) { } Actual result: -------------- array(2) { ["a"]=> int(0) ["c"]=> string(1) "0" } ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=53724&edit=1