php手动释放内存

<?php $s = str_repeat('1',1024); $b = &$s; $m=memory_get_usage(); //获取当前占用内存 echo $m."\n"; //unset($s); //$s = null; $mm = memory_get_usage(); //unset()后再查看当前占用内存 echo $mm . "\n"; echo $m -$mm ;

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