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<?php $newarray = array('489289', '536516', '332833', '536516'); $rockin = array( '489289' => array('536516','value1'), '332833' => array('536516'), ); foreach ($rockin as $array) { foreach ($array as $value) { if (in_array($value, $newarray)) { $key = array_search($value, $array); var_dump($key); $newarray = array_diff($newarray, array($key)); break; } } } var_dump($newarray);

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