Bug #54625 [Bgs]: string is equals a 0 !?

Edit report at http://bugs.php.net/bug.php?id=54625&edit=1 ID: 54625 Updated by: rasmus@php.net Reported by: bernardo at datamex dot com dot br Summary: string is equals a 0 !? Status: Bogus Type: Bug Package: Unknown/Other Function Operating System: Windows and Freebsd PHP Version: Irrelevant Block user comment: N Private report: N New Comment: Use === to do a strict equality check. == does type juggling because the Web isn't typed. Everything you get from a Web browser is a string so PHP makes sure that 1=='1'. In your example, you are comparing variables of different types, so PHP juggles them to match: The integer value of string 'e' is zero The integer value of boolean false is zero The string value of false is '' which is not 'e' Previous Comments: ------------------------------------------------------------------------ [2011-04-28 17:39:53] johannes@php.net 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 http://php.net/manual/en/types.comparisons.php ------------------------------------------------------------------------ [2011-04-28 17:32:28] bernardo at datamex dot com dot br Description: ------------ // tested both in // in windows 7 - php 5.2.12.12 // in freebsd 7 - php 5.3.3 // because 'e' equals zero, zero is false and false is not equal to 'e' var_dump(0 == 'e'); // true var_dump(false == 0); // true var_dump(false == 'e'); // false echo '<hr>'; // this means that when we compare int to string will always be equal? var_dump(0 == "e"); // true var_dump(0 == "Bernardo"); // true what is the meaning of this? I think it should not return true. Test script: --------------- <? var_dump(0 == 'e'); // true ?> Expected result: ---------------- bool(false) Actual result: -------------- bool(true) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=54625&edit=1