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

1 vote297 views1 answer
Blade template vs php core
PHP
0 vote332 views1 answer
Php if post exists
PHP
0 vote354 views1 answer
Provide filter condition in autocomplet field in drupal form using property
PHP
0 vote296 views1 answer
Laravel schedule run
PHP Laravel
0 vote360 views1 answer
Spatie/laravel-activitylog display only changed data
PHP Laravel
11 votes357 views5 answers
Laravel check auth
PHP Laravel
1 vote304 views1 answer
Change minutes in to hours carbon
PHP
6 votes314 views6 answers
Array to String Conversion in PHP
PHP
0 vote328 views1 answer
Php filter_var name
PHP
0 vote308 views1 answer
Fetch email from url contact form 7
PHP