array_walk ( array,funcname [, $parameter] );

<?php
   function call_back_function(value,key) {
      echo "The key key has the valuevalue \n";
   }
   input = array("a"=>"green", "b"=>"brown", "c"=>"blue", "red");

   array_walk(input,"call_back_function");
?>

The key a has the value green
The key b has the value brown
The key c has the value blue
The key 0 has the value red