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@ 2017-10-12T09:08:25Z

<?php

        $config = [
            'sitepoint.com/author' => SPAuthorTotalPageFetcher::class,
            'sitepoint.com/hor' => SPAuthorTotalPageFetcr::class
        ];
        
var_dump(key($config['0']));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
key: documentation ( source)

preferences:dark modelive preview

54.73 ms | 402 KiB | 5 Q