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PHP array_walk() Function

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.


Following below is the syntax to use this function -

array_walk ( $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 function returns TRUE.


Try out the below example -

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


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

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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