php5.3或以上版本可以使用php管理crontab计划任务，下面我先来体验一下，有需要学习了解的朋友可进入参考。
1.使用php-crontab-manager管理计划任务
要求 php>=5.3
使用方法举例
 代码如下 复制代码
use phpmanagercrontabcrontabmanager;
$crontab = new crontabmanager();
$crontab->enableorupdate('/tmp/my/crontab.txt');
$crontab->save();
添加一个简单的计划任务:
 代码如下 复制代码
use phpmanagercrontabcrontabmanager;
$crontab = new ssh2_crontab_manager();
$job = $crontab->newjob();
$job->on('* * * * *');
$job->onminute('20-30')->dojob(echo foo);
$crontab->add($job);
$job->onminute('35-40')->dojob(echo bar);
$crontab->add($job);
$crontab->save();
类文件
 代码如下 复制代码
path   = substr(__file__, 0, $path_length) . '/';  
  $this->handle  = 'crontab.txt';
  $this->cron_file = {$this->path}{$this->handle};
try
  {
   if (is_null($host) || is_null($port) || is_null($username) || is_null($password)) throw new exception(the host, port, username and password arguments must be specified!);
$this->connection = @ssh2_connect($host, $port);   
   if ( ! $this->connection) throw new exception(the ssh2 connection could not be established.);
   $authentication = @ssh2_auth_password($this->connection, $username, $password);
   if ( ! $authentication) throw new exception(could not authenticate '{$username}' using pasword: '{$password}'.);
  }
  catch (exception $e)
  {
   $this->error_message($e->getmessage());
  }
 }
 public function exec()
 {
  $argument_count = func_num_args();
  try
  {
   if ( ! $argument_count) throw new exception(there is nothing to exececute, no arguments specified.);
   $arguments = func_get_args();
$command_string = ($argument_count > 1) ? implode( && , $arguments) : $arguments[0];
$stream = @ssh2_exec($this->connection, $command_string);
   if ( ! $stream) throw new exception(unable to execute the specified commands:
{$command_string});
  }
  catch (exception $e)
  {
   $this->error_message($e->getmessage());
  }
  return $this;
 }
 public function write_to_file($path=null, $handle=null)
 {
  if ( ! $this->crontab_file_exists())
  {  
   $this->handle = (is_null($handle)) ? $this->handle : $handle;
   $this->path   = (is_null($path))   ? $this->path   : $path;   
   $this->cron_file = {$this->path}{$this->handle};
$init_cron = crontab -l > {$this->cron_file} && [ -f {$this->cron_file} ] || > {$this->cron_file};
$this->exec($init_cron);  
  }
return $this; 
 }
public function remove_file()
 {  
  if ($this->crontab_file_exists()) $this->exec(rm {$this->cron_file});  
  return $this;
 }
public function append_cronjob($cron_jobs=null)
 {
  if (is_null($cron_jobs)) $this->error_message(nothing to append!  please specify a cron job or an array of cron jobs.);
$append_cronfile = echo ';
$append_cronfile .= (is_array($cron_jobs)) ? implode(n, $cron_jobs) : $cron_jobs;
$append_cronfile .= '  >> {$this->cron_file};
$install_cron = crontab {$this->cron_file};
  $this->write_to_file()->exec($append_cronfile, $install_cron)->remove_file();
return $this;  
 }
public function remove_cronjob($cron_jobs=null)
 { 
  if (is_null($cron_jobs)) $this->error_message(nothing to remove!  please specify a cron job or an array of cron jobs.);
$this->write_to_file();
$cron_array = file($this->cron_file, file_ignore_new_lines);
if (empty($cron_array))
  {
   $this->remove_file()->error_message(nothing to remove!  the crontab is already empty.);   
  }
$original_count = count($cron_array);
if (is_array($cron_jobs))
  {
   foreach ($cron_jobs as $cron_regex) $cron_array = preg_grep($cron_regex, $cron_array, preg_grep_invert);
  }
  else
  {
   $cron_array = preg_grep($cron_jobs, $cron_array, preg_grep_invert);
  }
return ($original_count === count($cron_array)) ? $this->remove_file() : $this->remove_crontab()->append_cronjob($cron_array);
 }
 public function remove_crontab()
 {
  $this->remove_file()->exec(crontab -r);  
  return $this;
 }
 private function crontab_file_exists()
 {
  return file_exists($this->cron_file);
 }
private function error_message($error)
 {
  die(
error: {$error}
);
 }
}
项目地址
https://github.com/mediovskitechnology/php-crontab-manager
2.ssh2_crontab_manager 关于php管理计划任务的详细教程
具体内容参考：
http://net.tutsplus.com/tutorials/php/managing-cron-jobs-with-php-2/
参考资料：
http://stackoverflow.com/questions/4421020/use-php-to-create-edit-and-delete-crontab-jobs
http://www.bkjia.com/phpjc/632893.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/632893.htmltecharticlephp5.3或以上版本可以使用php管理crontab计划任务，下面我先来体验一下，有需要学习了解的朋友可进入参考。 1.使用php-crontab-manager管理计划任...