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Link: http://codepad.org/DFsPMcCj    [ raw code | output | fork ]

PHP, pasted on Oct 2:
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<?php

$filter1 = "red,green,blue,yellow";         
$parts1 = explode(',', $filter1);
$filter2 = "red,green,blue";        
$parts2 = explode(',', $filter2);


$result = array_diff($parts1 , $parts2 );
print_r($result);


Output:
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Array
(
    [3] => yellow
)


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