Compare the keys and values of two arrays, and return the matches (using a user-defined key comparison function):

SUBMITTED BY: henry1874w

DATE: June 23, 2017, 9:34 p.m.

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<?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);
?>