PHP array_walk_recursive() Function

PHP array_walk_recursive() Function

Hello dear readers! welcome back to another section of our tutorial on PHP. In this tutorial guide, we are going to be studying about the array_walk_recursive() Function in PHP.

The PHP array_walk_recursive() function applies the user-defined callback function to each element of the array. The array's keys and values are the parameters in the function.


Following below is the syntax to use this function -

array_walk_recursive( $array, $funcname [,$parameter])

Parameter Details

Sr.NoParameter & Description


It specifies an array.



The name of the user-made function.



It specifies a parameter to the user-made function.

Return Value

This built-in function returns TRUE on success and False on failure.


Try out the below example -

   function call_back_function($value,$key) {
      echo "The key $key has the value $value \n";
   $input1 = array("a"=>"green", "b"=>"brown", "c"=>"blue" );
   $input2 = array($input1, "d"=>"yellow", "e"=>"black");


When the above code is executed, it will produce the following result -

The key a has the value green
The key b has the value brown
The key c has the value blue
The key d has the value yellow
The key e has the value black

Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial guide, we are going to be discussing about the PHP array_arsort() Function.

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