Question

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What does $k => $v in foreach($ex as $k=>$v) mean?

I am trying to understand what this means:

foreach($this->domains as $domain=>$users) {  

// some code...

}

I understand $this->domains is an array that foreach will index over. But what does as $domain=>$users mean? I have only seen the => operator used in an array to set (key, value) pairs. The class has a member called $domain, but I assume that would be accessed as $this->domain.

Answer 1

The => operator specifies an association. So assuming $this->domains is an array, $domain will be the key, and $users will be the value.

<?php
$domains['example.com'] = 'user1';
$domains['fred.com'] = 'user2';

foreach ($domains as $domain => $user) {
    echo '$domain, $user\n';
}

Outputs:

example.com, user1
fred.com, user2

(In your example, $users is probably an array of users);