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@ 2017-08-14T13:59:41Z

<?php

class CI_Config {}

if (!class_exists('MX_Config')) {
    class MX_Config extends CI_Config {}
}

class MY_Config extends MX_Config {}

$config = new MY_Config();

var_dump(
    $config instanceof MX_Config,
    $config instanceof CI_Config
);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
class_exists: documentation ( source)

preferences:dark modelive preview

48.32 ms | 402 KiB | 5 Q