$a=array(1,2,3,4,5,6,7,8,9,0);
$b=array(1,3,5,7,9);
$out1 = array_diff($a, $b);
$out2 = array_diff($b, $a);
$out3 = array_merge($out1, $out2);
foreach($out3 as $rs3){
echo $rs3.' '; //2 4 6 8 0
} <div class="clear"></div>
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