Use php to manage crontab scheduled tasks under php5.3

Use php to manage crontab scheduled tasks under php5.3_PHP tutorial

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Release： 2016-07-13 10:47:19

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php version 5.3 or above can use php to manage crontab scheduled tasks. Let me try it out first. Friends who need to learn more can enter it for reference.

1. Use php-crontab-manager to manage scheduled tasks
Requires PHP>=5.3

Examples of usage

The code is as follows

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代码如下

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use phpmanagercrontabCrontabManager;

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

use phpmanagercrontabCrontabManager;

$crontab = new CrontabManager();

代码如下

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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();

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

Add a simple scheduled task:

The code is as follows	Copy code
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

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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);
}