php5.3下使用php管理crontab计划任务

作者：袖梨 2022-06-24

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

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 ( ! $stream) throw new Exception("Unable to execute the specified commands:
{$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);
}