PHP获得内存使用状态memory_get_usage()函数_PHP教程

function convert($size){
$unit=array('b','kb','mb','gb','tb','pb');
return @round($size/pow(1024,($i=floor(log($size,1024)))),2).' '.$unit[$i];
}
echo convert(memory_get_usage(true));
?>

if (!function_exists('memory_get_usage')) 

 {
     function memory_get_usage() 

     {

        $pid = getmypid();

       if (IS_WIN) 

       {

            exec('tasklist /FI "PID eq ' . $pid . '" /FO LIST', $output);

             return preg_replace('/[^0-9]/', '', $output[5]) * 1024;

         } 

         else

        {

           exec("ps -eo%mem,rss,pid | grep $pid", $output);

           $output = explode(" ", $output[0]);

           return $output[1] * 1024;

         }

    }

}