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YouTube Video Downloader Source Code in PHP

Posted: September 5th, 2009 | Author: admin | Filed under: Php, Web Secrets | 2 Comments »
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Source code for YouTube Video Downloader script has been released. You can use it in your own applications and website without any restriction. The script uses CURL to fetch data from the YouTube server and then display the link to download the video. Furthermore, it uses AJAX so the page will not refresh.

If you find it useful, please do not remove the backlink to this blog, www.web-tricks.info

You can view online demo of the working script:

YouTube Video Downloader Demo

You can also download the script Free from:

Download YouTube Video Downloader

The source code for front-end HTML design is:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  <html xmlns="http://www.w3.org/1999/xhtml">
  <head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>YouTube Easy Video Downloader</title>
  <script type="text/javascript" language="javascript" src="js/ajax.lib.js"></script>
  <script type="text/javascript" language="javascript" src="js/youtube.download.js"></script>
  <style type="text/css">
  <!--
  #yTubeLinkDiv {
  display: none;
  color: #00F;
  }
  #yTubeLinkDiv a{
  font-size: 18px;
  color: #00C;
  text-decoration: underline;
  }
  #yTubeLinkDiv a:hover{
  color: #F00;
  }
  -->
  </style>
  </head>

<body>
  <p>YouTube Video URL:</p>
  <p>
  <input name="url" type="text" id="url" size="55" maxlength="1000" />
  </p>
  <p>
  <input name="downloadBtn" type="button" id="downloadBtn" value="Get Download Link" onclick="getLink();" />
  </p>
  <div id="yTubeLinkDiv"></div>
  <p>Powered by <a href="http://www.web-tricks.info" title="Powered by www.Web-Tricks.info">www.Web-Tricks.info</a>
  <br />
  Please give me credit by placing a backlink to my website, if you find this tool useful</p>
  </body>
  </html>


There are two javascript files,ajax.lib.js and youtube.download.js. The source code for ajax.lib.js file is: 

/*
YouTube Easy Video Downloader Script version 1.0
Created by: Waseem Khan
Dated: September 05, 2009
WebSite: www.Web-Tricks.info
*/

function Ajax(url, method, parameters, responseFunction, returnType)
{
	this.url = url;
	this.parameters = parameters;
	this.method = method.toLowerCase();
	this.returnType = returnType.toLowerCase()

	this.getXMLHTTPObject = function()
	{
	  if (window.XMLHttpRequest)
	  {
		  // check for Safari, Mozilla, Opera...
		  XMLHttpRequestObject = new XMLHttpRequest();
	  }
	  else if (window.ActiveXObject)
	  {
		  // check for Internet Explorer
		  XMLHttpRequestObject = new ActiveXObject("Microsoft.XMLHTTP");
	  }
	  if (!XMLHttpRequestObject)
	  {
		  alert("Your browser does not support Ajax.");
		  // return false in case of failure
		  return false;
	  }
	  // return the object in case of success
	  return XMLHttpRequestObject;
	};

	    // initially set the object to false
	var ajaxObject = this.getXMLHTTPObject();

	this.sendRequest = function()
	{
	   if(ajaxObject)
	   {
		  // continue if the object is idle
		  if ((ajaxObject).readyState == 4 || (ajaxObject).readyState == 0)
		  {
			 // open connection and send request to server
			 if (this.method == "get")
			 {
			    (ajaxObject).open("GET", this.url + "?" + this.parameters, true);
			 }
			 else
			 {
				 (ajaxObject).open("POST", this.url, true);
			 }
			 // send the appropriate headers
			 (ajaxObject).setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
			 // set the function to be called on a change in ajaxObj state
			 (ajaxObject).onreadystatechange = function()
			 {
			    if ((ajaxObject).readyState == 4)
		        {
		           // continue if the response is healthy
		           if ((ajaxObject).status == 200)
		           {
				      if (this.returnType == "xml")
					  {
					     responseFunction(ajaxObject.responseXML);
					  }
					  else
					  {
						  responseFunction(ajaxObject.responseText);
					  }
				   }
				}
			 };
			 // set additional parameters (to be sent to server) to null
			 if (this.method == "get")
			 {
			    (ajaxObject).send(null);
			 }
			 else
			 {
				 (ajaxObject).send(this.parameters);
			 }
		  }
	   }
	};
	this.sendRequest();
}


The code for youtube.download.js is: 

/*
YouTube Easy Video Downloader Script version 1.0
Created by: Waseem Khan
Dated: September 05, 2009
WebSite: www.Web-Tricks.info
*/

function trim(s)
{
  return s.replace(/(^\s+)|(\s+$)/g, "");
}

function getLink()
{
   var yURL = document.getElementById('url').value;
   if (trim(yURL) == "")
   {
	  alert("You must provide a valid YouTube Video URL");
	  return;
   }
   var url = "youtube.download.php";
   var params = "url=" + encodeURIComponent(yURL);

   var ajax = new Ajax(url, "POST", params, yResponse, "Text");

   var yUrlDiv = document.getElementById('yTubeLinkDiv');
   yUrlDiv.style.display = "block";
   yUrlDiv.innerHTML = "Fetching download link..."
}

function yResponse(res)
{
   var yUrlDiv = document.getElementById('yTubeLinkDiv');
   if (trim(res) == "")
   {
	  yUrlDiv.style.display = "none";
	  alert("The YouTube Video URL you provided is invalid or the video has been removed.");
   }
   else
   {
      var url = 'Download Video in FLV format';
	  yUrlDiv.style.display = "block";
      yUrlDiv.innerHTML = url;
   }
}


The file which is called by the AJAX is youtube.download.php, source code is below: 

<?php

/*
YouTube Easy Video Downloader Script version 1.0
Created by: Waseem Khan
Dated: September 05, 2009
WebSite: www.Web-Tricks.info
*/

if(!isset($_POST['url']) || trim($_POST['url']) == "")
{
   echo "<h1>Invalid YouTube URL</h1>"; exit;
}

$target = strip_tags($_POST['url']);

define("WEBBOT_NAME", "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.9) Gecko/2009040821 Firefox/3.0.9");
define("CURL_TIMEOUT", 25);
define("COOKIE_FILE", "cookie.txt");

function openYoutubeLink($target, $ref)
{
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_HEADER, EXCL_HEAD);
	curl_setopt($ch, CURLOPT_NOBODY, FALSE);
	curl_setopt ($ch, CURLOPT_HTTPGET, TRUE);
	curl_setopt ($ch, CURLOPT_POST, FALSE); 

	curl_setopt($ch, CURLOPT_COOKIEJAR, COOKIE_FILE);
	curl_setopt($ch, CURLOPT_COOKIEFILE, COOKIE_FILE);
	curl_setopt($ch, CURLOPT_TIMEOUT, CURL_TIMEOUT);
	curl_setopt($ch, CURLOPT_USERAGENT, WEBBOT_NAME);
	curl_setopt($ch, CURLOPT_URL, $target);
	curl_setopt($ch, CURLOPT_REFERER, $ref);
	curl_setopt($ch, CURLOPT_VERBOSE, FALSE);
	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
	curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
	curl_setopt($ch, CURLOPT_MAXREDIRS, 4);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);     

	$res  = curl_exec($ch);
	curl_close($ch);
	return $res;
}

function splitString($string, $delineator, $desired, $type)
    {
$lc_str = strtolower($string);
$marker = strtolower($delineator);

  if($desired == BEFORE)
  {
	if($type == EXCL)
		$split_here = strpos($lc_str, $marker);
	else
		$split_here = strpos($lc_str, $marker)+strlen($marker);

	$parsed_string = substr($string, 0, $split_here);
  }

else
	{
	  if($type==EXCL)
		  $split_here = strpos($lc_str, $marker) + strlen($marker);
	  else
		  $split_here = strpos($lc_str, $marker) ;

	  $parsed_string =  substr($string, $split_here, strlen($string));
	}
return $parsed_string;
}

function returnBetween($string, $start, $stop, $type)
{
   $temp = splitString($string, $start, AFTER, $type);
   return splitString($temp, $stop, BEFORE, $type);
}

$ref = "http://www.youtube.com/";

$res = openYoutubeLink($target, $ref);

$start = 'var swfArgs = {"';
$stop = '};';

$res = returnBetween($res, $start, $stop, EXCL);

$res = urldecode($res);

$res = returnBetween($res, '5|http://', '",', EXCL);

echo trim($res);

?>
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How to save data as a CSV file using PHP

Posted: September 5th, 2009 | Author: admin | Filed under: Php | No Comments »
Tags: , ,
Save to:

There are multiple instances when you need to store the data as a file instead of outputting it in the browser. One common example is to store the data in a CSV (Comma Separated Values) file. You can output a file saving dialogue sending appropriate headers to the browser. Below is the example written in PHP. The code is commented so I hope there will be no difficulty in understanding.

<?php

// save the CSV data in a variable
$csvData = "name,email\n";
$csvData.= "waseem,waseem@waseem.com\n";
$csvData.= "ikram,ikram@ikram.com";

// filename to save data
$filename = "sample.csv";

// open file in write mode
$fh = fopen($filename, "w");

// write data to the file
fwrite($fh, $csvData);

// close the file
fclose($fh);

// send headers to output the CSV data as a file
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Content-Length: " . strlen($csvData));
header("Content-type: text/x-csv");
header("Content-Disposition: attachment; filename=$filename");
echo $csvData;

?>
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