CRON JOB in PHP dynamically

Prerequisites: Little knowledge of MVC framework and obviously PHP. Also safe mode should be off on server and PHP function shell_exec should be enabled.

I will describe how to create CRON job through PHP code within the MVC framework as simple as possible so that beginners and most programmers can easily understand. I want to describe in easy and short words as most programmers don’t feel very easy when they see a big length of an article and difficult technical wordings.
I would like to name mine
controller as cronController.php ,
model as cronModel.php and
view as cronView.php

Flow of creating cron job will go like this
cronController.php=>cronView.php=>cronController.php=>cronModel.php
Parameters from cronView.php will go to cronController.php and from cronController.php parameters will go to cronModel.php to make database operations. Here one thing should be noticed that its not necessary that you have to make model, but yes if you want to make database operations it will be good to use model. Here I will write (creating cron job script) in model because I need database insertion operation. You can also skip model if you want and write cron job script in controller.
cronView.php

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<form action=" cronController/cron_job_save" method="post" name="adminForm" id="adminForm" onsubmit="return check(this)">  <table border="0" class="tablehead" width="100%">  <tr>  <th width="25%" align="left">Set Timings</th>  <th width="75%" align="left"></th>  </tr>  <tr>  <td align="left">Min</td>  <td align="left"><input class="text_area" type="text" name="min" id="min" />  </td>  </tr>  <tr>  <td align="left">Hours</td>  <td align="left"><input class="text_area" type="text" name="hour" id="hour" />  (0-23)</td>  </tr>  <tr>  <td align="left">Day of Month</td>  <td align="left"><input type="text" name="day_of_month" id="day_of_month" />  (1-31)</td>  </tr>  <tr>  <td align="left">Month</td>  <td align="left"><input type="text" name="month" id="month" />  (1-12)</td>  </tr>  <tr>  <td align="left">Day of Week</td>  <td align="left"><input type="text" name="day_of_week" id="day_of_week" />  (0-6)</td>  </tr>  <tr>  <td align="left"></td>  <td align="left"><input name="Save" type="submit" class="button" id="Save" value="Create" /></td>  </tr>  </table> </form>

In the action of above form we wrote controllerName/ControllerFunction so it will go in cronController.php and will call cron_job_save function of cronController class and there do its action.
cronController.php

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Class cronController{       function index()     {     displayView("cronView.php");//displayView is function which will show view cronView.php     }       public function cron_job_save()     {         $objCron=new cronModel ();//cron is model name         $objCron->create_cron_job($_POST);       } }

In above controller main function is cron_job_save which will be called after we submit form. All the values will be posted through $_POST to the model. Its optional to use model we can do our work in our controller also without going to model but I used model because I needed some database operations.
cronModel.php

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class cronModel {       function create_cron_job($args)     {         //Do database operation if you need to do //         //Else write following code directly in controller         $min            =$args["min"];         $hour           =$args["hour"];         $day_of_month   =$args["day_of_month"];         $month          =$args["month"];         $day_of_week    =$args["day_of_week"];   $filePath= /usr/bin/php /var/www/vhosts/mydomain.com/httpdocs/filename.php;         shell_exec("(crontab -l ; echo "".$min." ".$hour." ".$day_of_month." ".$month." ".$day_of_week." ".$filePath." ") | crontab -");     } }

In above model we are performing necessary database operations and then after that calling shell_exec function which is taking day of month, month ,day of week and hour and minute at which they are supposed to execute and that’s it our cron job is set and filename.php will be executed at selected day, month, hour and minute.

http://www.codenterprise.com/how-to-create-cron-job-in-php-dynamically/