Bug #10678 Updated: distinction between false and "0" (string)

ID: 10678 Updated by: torben Reported By: ms@marcant.net Old-Status: Open Status: Bogus Bug Type: *General Issues PHP Version: 4.0.4pl1 Assigned To: Comments: This has been discussed several times on the mailing lists; check the archives at http://marc.theaimsgroup.com. The answer is in the manual: http://www.php.net/manual/en/language.operators.comparison.php Basically, 0 is a false value but is of type int. You want to test for a return value of false (type boolean), so you need the 'identical' comparison operator: '==='. $haystack = '1230'; if (strstr($haystack, '0') === false) { echo "oh no\n"; } Previous Comments: --------------------------------------------------------------------------- [2001-05-04 19:21:26] ms@marcant.net There is a subtle problem with functions returning 'false' as an return status indication. Take for example strstr(haystack, needle). The function returns 'false' to indicate that <needle> could not be found in <haystack> or returns the substring of haystack starting with <needle> With certain strings the above assertion is not true with php: $haystack='1230'; if (strstr($haystack,"0")==false) { echo ' oh no.. '; } --------------------------------------------------------------------------- ATTENTION! Do NOT reply to this email! To reply, use the web interface found at http://bugs.php.net/?id=10678&edit=2