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POBug in array_uintersect?
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  1. POBug in array_uintersect?
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    copied!<pre><code>&lt;? function filterIdenticalEntriesCallback($a, $b) { echo "&lt;tr&gt;&lt;td&gt;{$a['file']}&lt;/td&gt;&lt;td&gt;{$b['file']}&lt;/td&gt;&lt;td&gt;{$a['md5']}&lt;/td&gt;&lt;td&gt;{$b['md5']}&lt;/td&gt;&lt;/tr&gt;"; if ( (strcmp($a['file'], $b['file']) == 0 ) &amp;&amp; ( strcmp($a['md5'],$b['md5']) == 0)){ return 0; } return 1; } $vieja = array( array('file' =&gt; 'a', 'md5' =&gt; '1'), //cambia array('file' =&gt; 'b', 'md5' =&gt; '2'), //igual array('file' =&gt; 'c', 'md5' =&gt; '3'), //igual array('file' =&gt; 'd', 'md5' =&gt; '4'), //igual ); $nueva = array( array('file' =&gt; 'a', 'md5' =&gt; '2'), //cambia array('file' =&gt; 'b', 'md5' =&gt; '2'), //igual array('file' =&gt; 'c', 'md5' =&gt; '3'), //igual array('file' =&gt; 'd', 'md5' =&gt; '4'), //igual ); echo "&lt;table&gt;"; $ignorar = array_uintersect($nueva, $vieja, 'filterIdenticalEntriesCallback'); echo "&lt;/table&gt;"; echo "&lt;pre&gt;"; print_r($ignorar); echo "&lt;/pre&gt;"; ?&gt; </code></pre> <p>OUTPUT</p> <pre><code>b a 2 2 b c 2 3 d b 4 2 a c 2 3 b a 2 1 b c 2 3 d b 4 2 a c 1 3 c c 3 3 c a 3 2 a a 2 1 a b 2 2 a d 2 4 Array ( [2] =&gt; Array ( [file] =&gt; c [md5] =&gt; 3 ) ) </code></pre> <p>I cant understand why this code doesn't produce the correct output which should be an array with "B", "C" and "D" elements, because only "A" element is different from $vieja to $nueva...</p> <p>if I make both "A" elements equals the output is ok....</p> <p><em>EDIT:</em></p> <pre><code>function filterIdenticalEntriesCallback($a, $b) { echo "&lt;tr&gt;&lt;td&gt;{$a['file']}&lt;/td&gt;&lt;td&gt;{$b['file']}&lt;/td&gt;&lt;td&gt;{$a['md5']}&lt;/td&gt;&lt;td&gt;{$b['md5']}&lt;/td&gt;&lt;/tr&gt;"; if (strcmp($a['file'], $b['file']) == 0 ){ if ( strcmp($a['md5'],$b['md5']) == 0) return 0; else return 1; } else return -1; </code></pre> <p>}</p> <p>Using this callback is working ok, but I still dont understand why... what -1 and 1 callback results means to the function? I mean, I need only equal values... wich are when callback return 0... I don't need other cases...</p>
 

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