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blainelang/array_walk + anonymous function

Last active February 14, 2021 18:40
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Using an anonymous function with array_walk and passing in a variable so that it's in scope for the function to use.
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array_walk + anonymous function
/* Objective: Loop over an array of Drupal user objects and build a string of email addresses for the $to variable.
* At first there was an issue because the variable $to_email_array was not being accessible to the anonymous function
* and then I saw answer2 to a similar question:
* > http://stackoverflow.com/questions/11420520/php-variables-in-anonymous-functions
*/
$to_email_array = array();
array_walk($users_group, function(&$user, &$uid) use (&$to_email_array) {
$to_email_array[] = $user->mail;
});
$to = implode(',', $to_email_array);
@zahra-ove
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Thank you. Is it possible to define $to_email_array as a multidimensional array and use it in the array_walk function?

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