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<?php $existing = array(1,2,3,4); $onForm = array(3,4,5,6); $removed = array_diff($existing,$onForm); $new = array_diff($onForm,$existing); $unchanged = array_intersect($existing,$onForm); echo 'existing'; print_r($existing); echo 'form'; print_r($onForm); echo 'removed'; print_r($removed); echo 'new'; print_r($new); echo 'unchanged'; print_r($unchanged);
Output for git.master, git.master_jit, rfc.property-hooks
existingArray ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 ) formArray ( [0] => 3 [1] => 4 [2] => 5 [3] => 6 ) removedArray ( [0] => 1 [1] => 2 ) newArray ( [2] => 5 [3] => 6 ) unchangedArray ( [2] => 3 [3] => 4 )

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