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@ 2013-08-13T12:12:58Z

<?php

$foo = 11;
$bar = 12;
//optimal: memory used once
$foo = $foo ^ $bar;
$bar = $foo ^ $bar;
$foo = $foo ^ $bar;
var_dump($foo, $bar);
echo memory_get_peak_usage();

$foo = 11;
$bar = 12;
//readable:
$baz = $foo;
$foo = $bar;
$bar = $baz;
//
var_dump($foo, $bar);
echo memory_get_peak_usage();

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
memory_get_peak_usage: documentation ( source)

preferences:dark modelive preview

56.72 ms | 402 KiB | 5 Q