Saturday, 2 March 2019

PHP cURL for Downloading File From Url



This is one more post on Download Remote Files from URL, but in this blog we will use PHP cURL library for download file from URL. By using cURL library we will make simple feature like Save file from URL to server by using PHP script. In one of our previous post, in which we have discuss PHP Download file from URL using file_get_contents() method. But in this post we have use cURL for PHP Download file from URL. Because this method is still available in PHP 7 also.

Here we will make simple form for dynamically download file from entered URL using PHP and cURL. First we will write validation code for check enter string is valid url or not. If it is valid then it will proceed for downloading process using PHP cURL Library.

There are following cURL Library and function we will use for Download image from Url in PHP.

curl_init() - This method will initialize a cURL session.

curl_setopt() - This method will set option for transer cURL data. In this method we have use three option. First CURLOPT_URL option for fetch data from URL. Second is CURLOPT_RETURNTRANSFER option, it will return true on send data from URL in string format and third is CURLOPT_SSLVERSION.

curl_exec() - This method will execute cURL session.

curl_close() - This method will close cURL session.

There are some other function we has use with this cURL library, which you can find under source code. Below you can find complete source code of this post.







Source Code



<?php

//index.php

$image = '';
$error = '';

if(isset($_POST["download"]))
{
 if(empty($_POST["url"]))
 {
  $error = '<p class="text-danger"><b>Enter URL</b></p>';
 }
 else if(!filter_var($_POST["url"], FILTER_VALIDATE_URL))
 { 
  $error = '<p class="text-danger"><b>Invalid URL</b></p>';
 }
 else
 {
  $url = $_POST["url"];
  $start = curl_init();
  curl_setopt($start, CURLOPT_URL, $url);
  curl_setopt($start, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($start, CURLOPT_SSLVERSION, 3);
  $file_data = curl_exec($start);
  curl_close($start);
  $file_path = 'download/' . uniqid() . '.jpg';
  $file = fopen($file_path, 'w+');
  fputs($file, $file_data);
  fclose($file);
  $image = '<img src="'.$file_path.'" class="img-thumbnail" width="250" />';
 }
}

?>
<html>
 <head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>Download File from URL using PHP CURL</title>
  <meta content='width=device-width, initial-scale=1, maximum-scale=1' name='viewport'/>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />
  <style>
  .box
  {
   width:100%;
   max-width:720px;
   margin:0 auto;
  }
  </style>
 </head>
 <body>
  <div class="container">
   <br />
   <h2 align="center">Download File from URL using PHP CURL</h2><br />
   <div class="row">
    <div class="col-md-3">
     
    </div>
    <div class="col-md-9">
     <form method="post">
      <div class="form-group">
       <label>Enter URL</label>
       <input type="text" name="url" class="form-control input-lg" autocomplete="off" />
       <?php echo $error; ?>
      </div>
      <br />
      <br />
      <input type="submit" name="download" value="Download" class="btn btn-info btn-lg" />
      <br />
      <br />
      <?php echo $image; ?>
     </form>
     <br />
     
    </div>
   </div>
  </div>
  <div style="clear:both"></div>
  <br />
  
  <br />
  <br />
  <br />
 </body>
</html>







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