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@ 2017-07-08T14:59:50Z

<?php

$test = array(
    0 => 2,
    '_multiwidget' => 1
);

$keys = array_keys($test);
print_r($keys);

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
array_keys: documentation ( source)

preferences:dark modelive preview

43.35 ms | 402 KiB | 5 Q