#26821 [Bgs]: if("NANC" < 0) - always evaluates TRUE

ID: 26821 User updated by: ivo at benetech dot org Reported By: ivo at benetech dot org Status: Bogus Bug Type: Documentation problem Operating System: Linux / RH 7.3 PHP Version: 4.3.4 New Comment: > If someone asks you if A+B > 4 is, you wouldn't know what to calculate... I sincerely hope this would hold: http://www.php.net/manual/en/language.operators.php#language.operators.precedence ....otherwise theres bigger problems. If a statement such as "some arbitrary string" < 0 is not to be trusted then the documentation should be updated to reflect this. Currently it explains strong comparisons with '===', weak with '==' but it does not mention < or >, ony obliquely and it obviously does not. (http://www.php.net/manual/en/types.comparisons.php) p.s. I am working with a site that manipulates strings everywhere. most functions return < 0 on error or the processed string if all goes well. just finished updting it to return ints always & use references for strings. still think it's an outright bug or at least a documentation problem due to all the 'weak' type comparison references & examples everywhere. Previous Comments: ------------------------------------------------------------------------ [2004-01-09 11:04:29] sp@php.net Who wants to evaluate "NANC" < 0??? It _absolutely_ makes no sense. If someone asks you if A+B > 4 is, you wouldn't know what to calculate... FYI I've tried ivo's script. Under PHP 4.3.3 it produces "should happen...but doesnt" and under 4.3.0 it's "should not happen...but does". ------------------------------------------------------------------------ [2004-01-08 22:35:09] skissane at ics dot mq dot edu dot au Vrana: your comment makes no sense. If "NANC" is converted to 0, then 0 < 0 would be FALSE, not true. Compare these expressions: "NANC" < 0 result TRUE "NANC" < "0" result FALSE 0 < 0 result FALSE So it seems it is neither converting "NANC" to an integer 0, nor 0 to a string "0". What actually is going on? The documentation should clarify this. ------------------------------------------------------------------------ [2004-01-07 13:20:58] ivo at benetech dot org It also print 0 as expected. if( (int) "NANC" < 0) also evaluates as expected. ------------------------------------------------------------------------ [2004-01-07 05:53:18] vrana@php.net "NANC" is converted to 0 for comparison. It works for me as expected. What is printed by the code <?php echo intval("NANC"); ?> on your system? ------------------------------------------------------------------------ [2004-01-06 18:08:12] ivo at benetech dot org Documentation needs to be more explicit about php being strongly typed. http://www.php.net/manual/en/language.types.type-juggling.php or http://www.php.net/manual/en/language.types.string.php#language.types.string.conversion ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/26821 -- Edit this bug report at http://bugs.php.net/?id=26821&edit=1