How do I compare two array's values?

I have 2 arrays one retrieved from a database (saved results) and the other from an xml (new results)

$fromDB = array('123','124','524','15','616');
$开发者_Go百科fromXML = array('123','124','524','15','818');

I want to compare those two and see which values are old (fromDB) and which are new (fromXML) so to insert the old value in a different table.

How can i achieve this?

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The array_diff function is what you're looking for.

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Take a look at the array_diff() function