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PHP : array_walk_recursive() function

PHP: Apply a user function recursively to every member of an array

The array_walk_recursive() function apply a user defined function to every element of an array recursively. The user-defined function takes array's values and keys as parameters.

Version:

(PHP 5 and above)

Syntax:

array_walk_recursive(input_array, user_function, user_data)

Parameters:

Name Description Required /
Optional		 Type
input_array The input array. Required Array
user_function The name of the user-defined function. Required
user_data Additional parameter. If it is supplied, it will be passed as the third parameter to the user_function. Optional Mixed*

Return value:

TRUE on success or FALSE on failure.

Value Type: Boolean

Example:

<?php
function w3rfunction($value,$key)
{
echo "The key $key has the value $value<br />";
}
$tutorial1=array("x"=>"india","y"=>"Pakistan");
$tutorial2=array($tutorial1,"1"=>"China","2"=>"Japan");
array_walk_recursive($tutorial2,"w3rfunction");
?>

Output:

The key x has the value india
The key y has the value Pakistan
The   key 1 has the value China
The key 2 has the value Japan

Pictorial Presentation:

php function reference: array_walk_recursive() function

View the example in the browser

Practice here online :

See also

PHP Function Reference

Previous: array_values
Next: array_walk



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PHP: Tips of the Day

Filters the collection using the given callback

Example:

<?php
function tips_reject($items, $func)
{
  return array_values(array_diff($items, array_filter($items, $func)));
}

print_r(tips_reject(['Apple', 'Pear', 'Kiwi', 'Banana'], function ($item) {
  return strlen($item) > 4;
}));
?>

Output:

Array
(
    [0] => Pear
    [1] => Kiwi
)