PHP array_walk() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP array_walk() Function.

The array_walk() function applies the user-defined callback function to each element of the array array.

array_walk is not affected by the internal array pointer of array. The array_walk() will walk through the entire array regardless of the pointer position.

Syntax

Following below is the syntax to use this function -

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

READ: PHP array_unique() Function

Parameter Details

Sr.No	Parameter & Description
1	array(Required) It specifies an array.
2	funcname(Required) The name of the user-made function.
3	parameter(Optional) It specifies a parameter to the user-made function.

Return Value

This function returns TRUE.

Example

Try out the below example -

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

Output

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 0 has the value red

READ: PHP array_values() Function

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

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