The "array_walk()" function apply a user function to every member of an array.

    array_walk(array,function,parameter...)

In the above syntax each member of the "array" is applied to the user defined "function", and also can have parameters.

    <?php
    function funct1($value,$key) 
    {
     echo "The key $key has the value $value <br/>";
    }
    $b=array("1"=>"Cherry","2"=>"Apple");
    array_walk($b,"funct1");
    ?>

    The key 1 has the value Cherry
    The key 2 has the value Apple

In the above example all the elements of the array "$b" is applied in the function "funct1" to display the result.