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@ 2023-03-17T23:31:04Z

<?php

$post = array(
    'username' => 'Jane',
);

$action = empty($post['action']) ? 'default' : $post['action'];

var_dump($action);

Output
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var_dump: documentation ( source)

preferences:dark modelive preview

83.9 ms | 404 KiB | 5 Q