php5.3下使用php管理crontab計劃任務

php5.3或以上版本可以使用php管理crontab計劃任務，下面我先來體驗一下，有需要學習了解的朋友可進入參考。

1.使用php-crontab-manager管理計劃任務
要求 PHP>=5.3

使用方法舉例

 代碼如下 復制代碼

use phpmanagercrontabCrontabManager;

$crontab = new CrontabManager();
$crontab->enableOrUpdate('/tmp/my/crontab.txt');
$crontab->save();

添加一個簡單的計劃任務:

 代碼如下 復制代碼

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();

類文件

 代碼如下 復制代碼

<?php

Class Ssh2_crontab_manager {

 private $connection;
 private $path;
 private $handle;
 private $cron_file;

 function __construct($host=NULL, $port=NULL, $username=NULL, $password=NULL)
 {  
  $path_length  = strrpos(__FILE__, "/");
  $this->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 ( ! $stream) throw new Exception("Unable to execute the specified commands: <br />{$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($error)
 {
  die("<pre style='color:#EE2711'>ERROR: {$error}</pre>");
 }
 
}

項目地址
https://github.com/MediovskiTechnology/php-crontab-manager

2.Ssh2_crontab_manager 關於php管理計劃任務的詳細教程

具體內容參考：
http://net.tutsplus.com/tutorials/php/managing-cron-jobs-with-php-2/

參考資料：

http://stackoverflow.com/questions/4421020/use-php-to-create-edit-and-delete-crontab-jobs