Php array_walk

$arr = array(1, 2, 3);
// Call function on every item.
// Sign $item as reference to work on original item.
array_walk($arr, function(&$item, $key, $myParam){
  $item *= 2;
}, 'will be in myParam');
// $arr now is [2, 4, 6]

Php array_walk

PHP function array_walk(object|array &$array, callable $callback, mixed $arg) bool
------------------------------------------------------------------------------  
Apply a user function to every member of an array.
  
Parameters:
array|object--$array--The input array.
callable--$callback--Typically, funcname takes on two parameters. The array parameter's value being the first, and the key/index second.
If funcname needs to be working with the actual values of the array, specify the first parameter of funcname as a reference. Then, any changes made to those elements will be made in the original array itself.
Users may not change the array itself from the callback function. e.g. Add/delete elements, unset elements, etc. If the array that array_walk is applied to is changed, the behavior of this function is undefined, and unpredictable.
mixed--$arg--[optional] If the optional userdata parameter is supplied, it will be passed as the third parameter to the callback funcname.

Returns: true on success or false on failure.

Source: php.net

Similar codes

0 vote159 views1 answer
How To Unset Or Delete An Element From Array By Value In PHP?
PHP
1 vote211 views1 answer
Require and require_once difference in php
PHP
1 vote185 views1 answer
Tailwind text vertical alignment doesn't work
PHP
2 votes142 views1 answer
How to get data from html form in php
PHP
14 votes161 views3 answers
Laravel setup auth
PHP
1 vote140 views5 answers
Install multiple php versions windows xampp
PHP
3 votes181 views1 answer
Phone number validation, laravel
PHP Laravel
0 vote139 views1 answer
How to get many of quensation php programming language
PHP
0 vote161 views1 answer
Php dirpath multiple file extensions
PHP
2 votes175 views1 answer
Find and replace phpstorm
PHP