#18199 [Com]: is_array check fails???

ID: 18199 Comment by: yzhu@ou.edu Reported By: webmaster@aglaea.net Status: Feedback Bug Type: Arrays related Operating System: Linux PHP Version: 4.1.2 New Comment: I just upgraded to php-4.1.2 on RHL 7.2. Before this I was using a php-4.0.6-15, and experienced the same problem as webmaster@aglaea.net did (I assume). One thing should be clear about this issue is is_array fails under a particular circumtance. I encountered this problem when I have a mixed associative array like the following (actually its member's nature most likely automatically generated from some procedures, is not known before you test):(I assume the bug reporter did too) $as_ar = array( array("32"=>5, "you" =>6, "him"=>3, "her"=>2, 8, 3.4), "lone"=>19; array("red"=>"3", "yellow"=>4, "green"=>5), 28 array("east"=>2, "west"=13, "south"=>4, "north"=>5) ); Now, Try this: $keys = array_keys ($as_ar); if (is_array($as_ar[$keys[1]])){ echo "The second element is an array<br>"; } This will print the message on PHP-4.0.6-15. But on the same RHL 7.2, PHP-4.1.2 seems to be able to catch this, and the test return false. I did not test this code on any other versions However, if you believe this test result you will get into trouble. To get around this, I test the value instead the element (or keys). E.g. for this particular array I do: $theKeys = array_keys ($as_ar); $theValue = $as_ar[$theKeys[1]]; if ( is_array($theValue)){ echo "The second element is an array<br>"; } This will actually evaluate the nature of the element, not wether the element is more complex than a simple (indexed) one. I reported this finding on the PHP manual is_array page. And the editor removed it after some days. But this is a real issue, and can be confusing, frustrating too. I hope manual editors put something there to advise people how to cope with the problem. Well... Previous Comments: ------------------------------------------------------------------------ [2002-07-06 08:02:28] sander@php.net Can you provide a simple selfcontained sample script that reproduces your problem? ------------------------------------------------------------------------ [2002-07-06 07:52:28] webmaster@aglaea.net Unless I'm dementing fast, this bit of code: $teams = $league->getTeams(); if (is_array($teams)) { array_walk($teams, 'InDiv'); } should not do the array_walk when $teams is either 'null' or '0', but in my page, it keeps on trying to do the array_walk, which obviously goes wrong. I've also tried: if ($teams) { and if ($teams != null) you can see the precise details of my PHP-version and system at www.korfballworld.com/test/info.php ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=18199&edit=1