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@ 2017-07-07T14:30:27Z

<?php

$dis = [45 => 422.555, 67=> 596.555, 72 => 322.55];
asort($dis);
$keys = array_key($dis);
print_r($keys);

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
asort: documentation ( source)

preferences:dark modelive preview

82.01 ms | 402 KiB | 5 Q