#27142 [Bgs->Opn]: Inconsistent comparing

ID: 27142 User updated by: tomas dot matousek at matfyz dot cz Reported By: tomas dot matousek at matfyz dot cz -Status: Bogus +Status: Open Bug Type: Zend Engine 2 problem Operating System: WinXP PHP Version: 5.0.0b3 (beta3) New Comment: Well, I can choose another sorting type by the 2nd argument. But that doesn't solve the problem with the less-than (greater-than) operator. This operator is supposed to be transitive in common programming languages. But in PHP it is not: "101a" < "6" ... string comparison "6" < "100" ... numerical comparison "100" < "101a" ... string comparison So I get the result "101a" < "101a" which is nonsense. The non-transitivity obviously cause the problem with sorting which I've reported. Maybe it is intended behavior but there is no mention about it in the documentation. Previous Comments: ------------------------------------------------------------------------ [2004-02-04 19:29:56] sniper@php.net See http://www.php.net/asort and notice the 2nd option for this function. Then see http://www.php.net/sort what values it accepts. Then try those values. Then fix your own compare function. ------------------------------------------------------------------------ [2004-02-04 06:54:13] tomas dot matousek at matfyz dot cz Description: ------------ The way in which elements of an array are compared is inconsistent. Reproduce code: --------------- $a = $c = array("101a","100","6"); $b = $d = array("100","6","101a"); // standard comparison: $f = create_function('$a,$b','return ($a<$b) ? -1:($a>$b ? +1:0);'); asort($a); asort($b); uasort($c,$f); uasort($d,$f); print_r($a); print_r($b); print_r($c); print_r($d); Expected result: ---------------- Than I would expect all 'print_r' print arrays with the same order of values. I would expect that items implicitly converted into numbers during comparison should precede those of type string. Actual result: -------------- Array ( [2] => 6 [1] => 100 [0] => 101a ) Array ( [2] => 101a [1] => 6 [0] => 100 ) Array ( [2] => 6 [1] => 100 [0] => 101a ) Array ( [2] => 101a [1] => 6 [0] => 100 ) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=27142&edit=1