Actually array_intersect finds the dublicate values, here is my approach which is 5 times faster than built-in function array_intersect().. Give a try..
<?php
function my_array_intersect($a,$b)
{
for($i=0;$i<sizeof($a);$i++)
{
$m[]=$a[$i];
}
for($i=0;$i<sizeof($a);$i++)
{
$m[]=$b[$i];
}
sort($m);
$get=array();
for($i=0;$i<sizeof($m);$i++)
{
if($m[$i]==$m[$i+1])
$get[]=$m[$i];
}
return $get;
}
?>
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