Description:
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As this script shows, the array_diff function doesn't give the expected result on a php4.2.3 :



Reproduce code:
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<?
$today_list = array("pic_0710.jpg","pic_0740.jpg");
$yesterday_list = array("pic_0710.jpg","pic_0740.jpg","pic_0910.jpg");
$result = array_diff($today_list,$yesterday_list);

var_dump($result);

?>

Expected result:
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array(1) { [0]=>  string(12) "pic_0910.jpg" }

Actual result:
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array(0) { }