php popen实现多任务
<?php$update_num = 1000;$limit = 100;$p_num = 0;$line_cmd = 'ps -ef | grep doit.php | grep -v grep | wc -l';$exec_cmd = '/usr/local/php/bin/php doit.php %s & > /dev/null 2>&1';$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 - $t1,2);?><?phpsleep(2);$fp = fopen('doit.txt','a');fwrite($fp,$argv."\n");fclose($fp);exit(0);?>
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