Bug #81452 [NEW]: if comparison with '==' operator between integer and a string

From: remy dot dernat at umontpellier dot fr Operating system: linux kernel 5.13.14-100.fc33 PHP version: 7.4.23 Package: Unknown/Other Function Bug Type: Bug Bug description:if comparison with '==' operator between integer and a string Description: ------------ I have a generic function which is comparing two string. The success string in my code is "1" (an integer actually). Sometimes, the comparing string is something like a date DD/MM/YY or MM/DD/YY. If the first two characters are 1 or 01 it will result in a succeeded condition. I do not want to test if the compared string is a date or not, because, as I previously said, I may have many values, and I still want a Ok result if I compare int "1" to "01" or "1" string (so, I do not want to use "==="). Is there something special with "/" character, which creates such an issue ? Indeed, if I try to do a cast from this special string to a float it results in the "1" value anyway. Test script: --------------- $str1 = "01/2/21"; //$str1 = "01"; $str2 = 1; if($str1 == $str2) { echo "Ok !!!\n"; } else { echo "Not equal\n"; } //echo var_dump($str1); //echo "\n"; //echo var_dump($str2); //echo "\n"; Expected result: ---------------- Not equal Actual result: -------------- Ok !!! -- Edit bug report at https://bugs.php.net/bug.php?id=81452&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=81452&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=81452&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=81452&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=81452&r=needscript Try newer version: https://bugs.php.net/fix.php?id=81452&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=81452&r=support Expected behavior: https://bugs.php.net/fix.php?id=81452&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=81452&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=81452&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=81452&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=81452&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=81452&r=dst IIS Stability: https://bugs.php.net/fix.php?id=81452&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=81452&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=81452&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=81452&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=81452&r=mysqlcfg