<?php $foo = 'foo'; var_dump($a = memory_get_usage()); foreach (range(1,100) as $i) { $$i = $foo; } var_dump($b = memory_get_usage()); foreach (range(1,100) as $y) { $$y &= $foo; } var_dump($c = memory_get_usage()); echo "Copy: " . ($b - $a) . "\n"; echo "Ref : " . ($c - $b) . "\n";
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