Doc #53908 [Opn->Csd]: String comparison by == and ===

Edit report at http://bugs.php.net/bug.php?id=53908&edit=1 ID: 53908 Updated by: vrana@php.net Reported by: aaz at althenia dot net Summary: String comparison by == and === -Status: Open +Status: Closed Type: Documentation Problem Package: Documentation problem PHP Version: 5.3.5 -Assigned To: +Assigned To: vrana Block user comment: N Private report: N New Comment: 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. Changed to "$a is equal to $b after type juggling". There has already been this statement right behind the table: "If ... the comparison involves numerical strings, then each string is converted to a number". And there's also the table Comparison with Various Types. Previous Comments: ------------------------------------------------------------------------ [2011-02-10 12:44:46] vrana@php.net Automatic comment from SVN on behalf of vrana Revision: http://svn.php.net/viewvc/?view=revision&revision=308181 Log: Equals after type juggling (doc bug #53908) ------------------------------------------------------------------------ [2011-02-02 13:51:25] aaz at althenia dot net Description: ------------ Currently http://www.php.net/manual/en/language.operators.comparison.php says in the table: $a == $b Equal TRUE if $a is equal to $b. $a === $b Identical TRUE if $a is equal to $b, and they are of the same type. (introduced in PHP 4) This is confusing because "1.2" == "1.20" (so "$a is equal to $b"), and they are of the same type, but "1.2" !== "1.20". In other words, the type comparison is not the only difference between == and ===, as implied by this table. I suggest rewording this to something like: $a === $b Identical TRUE if $a is identical in type and value to $b. Below it also says The type conversion does not take place when the comparison is === or !== as this involves comparing the type as well as the value. The was added due to bug 50738. However, the "as this involves" part is not important here, but again implies that the type comparison is the only difference, so I suggest removing it. A section dealing specifically with the smart string comparison would be very helpful, especially since it is different from normal string-to-number conversion ("5z" == 5 while "5z" != "5"). This could even be a separate page (like http://www.php.net/manual/en/language.oop5.object-comparison.php for objects, which is linked from the second table). Examples can come from past bugs: bug 1974, bug 23110, bug 25763, bug 25943, bug 39084, bug 43304. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=53908&edit=1