如何从我的第一个数组中获取随机用户名但检查第二个数组

Question

How can I get a random username from my first array, but the username selected shouldn't be in the "denied usernames Array" in PHP

Array of usernames
Array ( 
  [0] => stdClass Object ( [user_login] => emma88 ) 
  [1] => stdClass Object ( [user_login] => milli ) 
  [2] => stdClass Object ( [user_login] => publishers@a.com ) 
  [3] => stdClass Object ( [user_login] => shawn ) 
  [4] => stdClass Object ( [user_login] => shawnfao2 ) 
) 
2021-03-23
2021-03-23

denied usernames Array: 
Array ( 
   [0] => Array ( [username] => emma88 ) 
   [1] => Array ( [username] => milli ) 
   [2] => Array ( [username] => publishers@a.com ) 
)

Answer 1

Have a look at array_filter :

Filters elements of an array using a callback function

Using an appropriate callback, you can create a list of users which are not in the denied list, eg

$filteredUsers = array_filter($users, function($item) use ($denyList) {
    return ! in_array($item->user_login, $denyList);
}

You can use array_column to simplify the deny list array first.

You can then use array_rand or shuffle to pick one at random.

Answer 2

1. For both $valid and $invalid users;

   • Use array_column to get an array of all the user_login

2. Use array_diff to get all the users that are in $validusers , but not in $invalidusers

3. Use array_rand to get a single index of the newly array

<?php

    $valid = [ (Object) ['user_login' => 'emma88'], (Object) ['user_login' => 'milli'], (Object) ['user_login' => 'shawn'] ]; 
    $invalid = [ (Object) ['user_login' => 'emma88'] ]; 

    $validusers = array_column($valid, 'user_login');
    $invalidusers = array_column($invalid, 'user_login');

    $onlyvalidusers = array_diff($validusers, $invalidusers);

    $randIndex = array_rand($onlyvalidusers, 1);
    var_dump($onlyvalidusers[$randIndex]);

Try it online!