PHP array_walk() function

The array_walk( ) function is an inbuilt function of PHP. It is used to apply a user supplied function to every element of an array. This function was introduced in 4.0.

Syntax

bool array_walk ( array &$array , callable $callback [, mixed $userdata = NULL ] );

Parameters

Parameter	Description	Is compulsory
array	The input array.	compulsory
User function	The name of the userdefined function.	compulsory
User data	If it is supplied, it will be passed as the third parameter to the user function	Optional

Return Values

The array_walk( ) function returns true on success or false on failure.

Example 1

<?php
function userfunction($value, $key)
{
		echo "The key $key has the value $value \n";
}
$tech = array("a"=>"youtube", "b"=>"google", "c"=>"whatsapp");
array_walk($tech, "userfunction");
?>

Output:

The key a has the value youtube
The key b has the value google
The key c has the value whatsapp

Example 2

<?php
function  myfunction($value,$key)
{
echo "Javatpoint $key has $value \n";
}
$tutorials=array("tutorial1"=>"php","tutorial2"=>"java","tutorial3"=>"python");
array_walk($tutorials,"myfunction");
?>

Output:

Javatpoint tutorial1 has php
Javatpoint tutorial2 has java 
Javatpoint tutorial3 has python

Example 3

<?php
function  pairs($value, $key) 
{
		echo "$key and $value have been paired together.\n";
}
$game = array('cricket' => 'sachin', 'hockey' => 'sandeep');
array_walk($game, 'pairs');
?>

Output:

cricket and sachin have been paired together.
hockey and sandeep have been paired together.

Example 4

<?php
	function callfunction($value,$key)
	{
		echo "The key $key has the value $value.\n";
	 }
$news=array("a"=>"aajtak","b"=>"zee news","c"=>"ndtv");
		array_walk($news,"callfunction");
?>

Output:

The key a has the value aajtak.
The key b has the value zee news.
The key c has the value ndtv.

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