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@ 2017-09-16T17:57:44Z

<?php

$headers = array(
    'User-Agent' => 'Mozilla',
);
$headers = array_change_key_case($headers); // Convert all keys to lower
$keyExists = array_key_exists('user-agent', $headers);
var_dump($keyExists);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_change_key_case: documentation ( source)

preferences:dark modelive preview

24.42 ms | 405 KiB | 5 Q