array_walk() function in php

PHP array_walk() function is used to walks through the entire PHP array. It is an inbuilt function of PHP. This function also contains a user-defined function in which conditions to be applied to every element of an array.

Syntax:

here,

• $array is a PHP array on which this function to be applied. It is mandatory
• user_function is a user-defined block of code that applied to every element of $array. It is also mandatory.
• $param represents one or more parameters for user-defined function. It is optional.

Example:

<?php
function user_function($val,$key)
{
echo "The key $key has the value $val. <br>";
}
$arr=array("fruit1"=>"apple","fruit2"=>"orange","fruit3"=>"fig","fruit4"=>"banana","fruit5"=>"guava");
array_walk($arr,"user_function");
?>

Output: