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@ 2017-07-10T11:06:23Z

<?php
$formatted = ['foo' => 'bar', 'foo10' => 'bar10'];
$formatted = array_change_key_case($formatted, CASE_UPPER);
var_dump($formatted);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

35.45 ms | 402 KiB | 5 Q