php popen兌現多任務

php popen實現多任務

 /dev/null 2>&1';$t1 = microtime(1);for($i = 0 ; $i < $update_num ; $i++){        if($p_num <=0){                $fp1 = popen($line_cmd,'r');                //current shell process numbers                $line = fread($fp1,512);                pclose($fp1);                //processes can be pushed                $p_num = $limit - $line;                if($p_num <= 0 ){                        usleep(100);                }        }        $p_num = $p_num -1;        $cmd = sprintf($exec_cmd,$i);        $fp = popen($cmd,'r');        pclose($fp);}$t2 = microtime(1);echo round($t2 - $t1,2);?>

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