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@ 2013-10-07T12:44:36Z

<?php

$i = 1;
$i = $i++ + ++$i;
var_dump($i);

$i = 1;
$i = ++$i + $i++;
var_dump($i);

$i = 1;
$i = ++$i + ++$i;
var_dump($i);

$i = 1;
$i = $i++ + $i++;
var_dump($i);

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive preview

36.78 ms | 402 KiB | 5 Q