#50738 [Csd]: Unclear documentation in numerical string comparison

ID: 50738 User updated by: I dot F dot A dot C dot Fokkema at LUMC dot nl Reported By: I dot F dot A dot C dot Fokkema at LUMC dot nl Status: Closed Bug Type: Documentation problem Operating System: All PHP Version: Irrelevant New Comment: Almost... :) Now it doesn't include anymore that if one is a normal string and the other is a number (int/float) that the string will be converted. Because ('a' == 0 && 'a' == 0.0) ! Keeping the first sentence (although changing int=>number) and add it to your new text should suffice, don't you think? So how about: "If you compare a number with a string, the string is converted to a number. If a comparison involves numerical strings, then each string in the comparison is converted to a number and then the comparison is performed numerically. The type conversion does not take place when the comparison is === or !== as these involve comparing the type as well as the value. These rules also apply to the switch statement." Previous Comments: ------------------------------------------------------------------------ [2010-01-13 14:49:03] rquadling@php.net Also, 2 strings are NOT compared as "integers" ... php -r "var_dump('123.4'=='1.234e2');" outputs bool(true) So ... "If a comparison involves numerical strings, then each string in the comparison is converted to a number and then the comparison is performed numerically. The type conversion does not take place when the comparison is === or !== as these involve comparing the type as well as the value. These rules also apply to the switch statement." I think covers it all and the correction with the word "integers". ------------------------------------------------------------------------ [2010-01-13 13:53:42] I dot F dot A dot C dot Fokkema at LUMC dot nl I hope I'm not bothering you too much now, but do you think people will understand the conversion also doesn't take place when comparing two numerical strings? Now it seems to me it's affecting only the integer-to-string comparison... By the way, !=== needs to be !== :) ------------------------------------------------------------------------ [2010-01-13 13:31:48] rquadling@php.net This bug has been fixed in the documentation's XML sources. Since the online and downloadable versions of the documentation need some time to get updated, we would like to ask you to be a bit patient. Thank you for the report, and for helping us make our documentation better. ------------------------------------------------------------------------ [2010-01-13 13:25:31] svn@php.net Automatic comment from SVN on behalf of rquadling Revision: http://svn.php.net/viewvc/?view=revision&revision=293501 Log: Fix#50738 - Type juggling is excluded from identical and not identical comparisons. "If you compare an integer with a string, excluding the identical (===) and not identical (!===) operators, the string is ..." ------------------------------------------------------------------------ [2010-01-13 11:14:50] rquadling@php.net How about ... "If you compare an integer value with a string value (as opposed to comparisons including type; === and !===), ..." ------------------------------------------------------------------------ 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/50738 -- Edit this bug report at http://bugs.php.net/?id=50738&edit=1