(PHP 5, PHP 7)
array_walk_recursive — Apply a user function recursively to every member of an array
array_walk_recursive ( array|object &$array , callable $callback [, mixed $userdata = null ] ) : bool
Applies the user-defined callback function to each element of the array. This function will recurse into deeper arrays.
array
The input array.
callback
Typically, callback takes on two parameters. The array parameter's value being the first, and the key/index second.
Note:
If
callbackneeds to be working with the actual values of the array, specify the first parameter ofcallbackas a reference. Then, any changes made to those elements will be made in the original array itself.
userdata
If the optional userdata parameter is supplied, it will be passed as the third parameter to the callback.
Returns true on success or false on failure.
Example #1 array_walk_recursive() example
<?php
$sweet = array('a' => 'apple', 'b' => 'banana');
$fruits = array('sweet' => $sweet, 'sour' => 'lemon');
function test_print($item, $key)
{
echo "$key holds $item\n";
}
array_walk_recursive($fruits, 'test_print');
?> The above example will output:
a holds apple b holds banana sour holds lemon
You may notice that the key 'sweet' is never displayed. Any key that holds an array will not be passed to the function.
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https://www.php.net/manual/en/function.array-walk-recursive.php