The "array_map()" function sends each value of an array to a function, then returns an array with new value that are modified inside the function.

    array_map(function,array1,array2,array3)

In the above syntax the "array1" is an mandatory field, "array2", "array3" are optional, "function" is also a mandatory field, to which all the values of "array1" is send to.

   <?php
   function funct1($d) 
    {
      if ($d==="Cherry")
	 {
	  return "Red";
	 }
      return $d;
     }    
   $a=array("Guava","Cherry","Orange");
   print_r(array_map("funct1",$a));
   ?>

    Array ( [0] => Guava [1] => Red [2] => Orange )

In the above example each value of the array "$a" is send to the function "funct1", where the value "Cherry" is checked for,if true, then returns the value "Red".