<?php
/
 * @component to write sample script which will pass to backend jobs
 *
 */

App::uses('Component', 'Controller');
class BackgroundScriptComponent extends Component {

    public function crawllUrls($crawling) {   // Passing 200 urls to crawl

        for ($i = 0; $i < $Counter; $i++) {

			/*
				Internal code which is running perfect using browser hit
			*/

        }
    }
}

/* @component to write sample script which will pass to backend jobs */

Controller:

class ScriptController extends AppController {

	public $components = array('BackgroundScript');

	public function CreateBackendProcess() {
		$this->layout = false;
		$this->autoRender = false;

		$arrOfUrls = array('500 url there in this array');

		//echo $this->BackgroundScript->crawllUrls($crawling);  // This line having Component method call. I do not want to call this as same as.. It should call from CLI

		$cmd = "";    //what should come in this $cmd to calls BackgroundScript's crawllUrls() method component which will pass to exec()

		exec($cmd, $pid);

		echo "<br />Script Running with process id " . json_encode($pid); //I will save this PS ID to database
		exit;
	}
}