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array_intersect_key()

<?php
function myfunction($a,$b)
{
if ($a===$b)
  {
  return 0;
  }
  return ($a>$b)?1:-1;
}

$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("d"=>"red","b"=>"green","e"=>"blue");

$result=array_intersect_uassoc($a1,$a2,"myfunction");
print_r($result);
?>


Output:
Array ( [b] => green )

Syntex:
array_intersect_uassoc(array1, array2, array3, ..., myfunction)

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