php popen兑现多任务

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 

<?php sleep(2);
$fp = fopen('doit.txt','a');
fwrite($fp,$argv[1]."\n");
fclose($fp);
exit(0);
?>