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@ 2017-07-03T12:33:12Z

<?php
$a = "10 kB";
$b = "5 kB";
$c = $a-$b;
echo $c;
var_dump($_REQUEST);
?>

Output
Performance
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var_dump: documentation ( source)

preferences:dark modelive preview

42.64 ms | 402 KiB | 5 Q