Php Development » curl http://www.maheshchari.com Just another WordPress weblog Tue, 17 Jan 2012 02:42:48 +0000 en hourly 1 http://wordpress.org/?v=3.1 simple curl function to send data remote server http://www.maheshchari.com/simple-curl-function-to-send-data-remote-server/ http://www.maheshchari.com/simple-curl-function-to-send-data-remote-server/#comments Wed, 17 Nov 2010 04:49:43 +0000 mahesh chari http://www.maheshchari.com/?p=560 simple PHP curl function

below example function is used to send the form data or post data to remote server . i have mentioned detailed explanation on comments.

Code

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function curl($url, $method = 'get', $header = null, $postdata = null, $timeout = 60)
	{
		$s = curl_init();
		// initialize curl handler 
 
		curl_setopt($s,CURLOPT_URL, $url);
		//set option  URL of the location 
		if ($header) 
			curl_setopt($s,CURLOPT_HTTPHEADER, $header);
		//set headers if presents
		curl_setopt($s,CURLOPT_TIMEOUT, $timeout);
		//time out of the curl handler  		
		curl_setopt($s,CURLOPT_CONNECTTIMEOUT, $timeout);
		//time out of the curl socket connection closing 
		curl_setopt($s,CURLOPT_MAXREDIRS, 3);
		//set maximum URL redirections to 3 
		curl_setopt($s,CURLOPT_RETURNTRANSFER, true);
		// set option curl to return as string ,don't output directly
		curl_setopt($s,CURLOPT_FOLLOWLOCATION, 1);
		curl_setopt($s,CURLOPT_COOKIEJAR, 'cookie.txt');
        curl_setopt($s,CURLOPT_COOKIEFILE, 'cookie.txt'); 
		//set a cookie text file, make sure it is writable chmod 777 permission to cookie.txt
 
		if(strtolower($method) == 'post')
		{
			curl_setopt($s,CURLOPT_POST, true);
			//set curl option to post method
			curl_setopt($s,CURLOPT_POSTFIELDS, $postdata);
			//if post data present send them.
		}
		else if(strtolower($method) == 'delete')
		{
			curl_setopt($s,CURLOPT_CUSTOMREQUEST, 'DELETE');
			//file transfer time delete
		}
		else if(strtolower($method) == 'put')
		{
			curl_setopt($s,CURLOPT_CUSTOMREQUEST, 'PUT');
			curl_setopt($s,CURLOPT_POSTFIELDS, $postdata);
			//file transfer to post ,put method and set data
		}
 
		curl_setopt($s,CURLOPT_HEADER, 0);			 
		// curl send header 
		curl_setopt($s,CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1');
		//proxy as Mozilla browser 
		curl_setopt($s, CURLOPT_SSL_VERIFYPEER, false);
		// don't need to SSL verify ,if present it need openSSL PHP extension
 
		$html = curl_exec($s);
		//run handler
 
		$status = curl_getinfo($s, CURLINFO_HTTP_CODE);
		// get the response status
 
		curl_close($s);
		//close handler
 
		return $html;
		//return output
}

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]]> http://www.maheshchari.com/simple-curl-function-to-send-data-remote-server/feed/ 1 Upload Image File To Remote Server With PHP cURL http://www.maheshchari.com/upload-image-file-to-remote-server-with-php-curl/ http://www.maheshchari.com/upload-image-file-to-remote-server-with-php-curl/#comments Fri, 26 Mar 2010 23:40:55 +0000 mahesh chari http://www.maheshchari.com/?p=538 How to upload image file to remote server with PHP cURL

In this example we learn how to upload static files to remote server using PHP cURL library.

We must know following functionality before we continue this example

Files and Folders

Download Example

For this example we use three files

  • uploader.php -that receives the files on to the remote server.
  • handler.php -is used to web based client to upload the file.
  • curl_handler.php -PHP cURL uploading client to upload file.

Since we use same host to both local and remote server ,we create separate directories

  • local_files/ - these files will be uploaded to the remote server ,means to uploaded_files directory.
  • uploaded_files/ – these files are from the uploading client from both web based and PHP cURL based.

uploader.php

 
$upload_directory=dirname(__FILE__).'/uploaded_files/';
//check if form submitted
if (isset($_POST['upload'])) {  
    if (!empty($_FILES['my_file'])) { 
			//check for image submitted
    		if ($_FILES['my_file']['error'] > 0) { 
			// check for error re file
            echo "Error: " . $_FILES["my_file"]["error"] ;
        } else {
			//move temp file to our server            
			move_uploaded_file($_FILES['my_file']['tmp_name'], 
			$upload_directory . $_FILES['my_file']['name']);	
			echo 'Uploaded File.';
        }
    } else {
	        die('File not uploaded.'); 
			// exit script
    }
}

handler.php

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>
<form action="uploader.php" method="post" enctype="multipart/form-data" name="form1" id="form1">
  <input type="file" name="my_file" id="my_file" />
  <input type="submit" name="upload" id="upload" value="Upload" />
</form>
</body>
</html>

curl_handler.php

$local_directory=dirname(__FILE__).'/local_files/';
 
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_VERBOSE, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible;)");
    curl_setopt($ch, CURLOPT_POST, true);
	curl_setopt($ch, CURLOPT_URL, 'http://localhost/curl_image/uploader.php' );
	//most importent curl assues @filed as file field
    $post_array = array(
        "my_file"=>"@".$local_directory.'shreya.jpg',
        "upload"=>"Upload"
    );
    curl_setopt($ch, CURLOPT_POSTFIELDS, $post_array); 
    $response = curl_exec($ch);
	echo $response;

Download Example

]]> http://www.maheshchari.com/upload-image-file-to-remote-server-with-php-curl/feed/ 2 Submitting form to remote server with array of parameters http://www.maheshchari.com/submitting-form-to-remote-server-with-array-of-parameters/ http://www.maheshchari.com/submitting-form-to-remote-server-with-array-of-parameters/#comments Thu, 18 Mar 2010 01:04:34 +0000 mahesh chari http://www.maheshchari.com/?p=454 submit a form with post method to remote server using php curl

We learn how to submit the form data to remote server in my previous example with URL string.
Here we can pass data with POST multipart method,main difference is that we passs it as array.

To submit forms using cURL, we need to follow the below steps:

1. Prepare the data to be posted
2. Connect to the remote URL
3. Post (submit) the data
4. Fetch response and display it to the user or do some other stuff with it.

Below Example Has two files,one to post the data and other is to process the data.

/*
 * Data which is to submitted to the remote URL
 */
 
 
$post_array = array('fname'=>'mahesh','lname'=>'chari');
 
/*
 * Initialize cURL and connect to the remote URL
 * You will need to replace the URL with your own server's URL
 * or wherever you uploaded this script to. 
 */
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://example.com/curlpost_handler.php' );
 
/*
 * Instruct cURL to do a regular HTTP POST
 */
curl_setopt($ch, CURLOPT_POST, TRUE);
 
/*
 * Specify the data which is to be posted
 */
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_array);
 
/*
 * Tell curl_exec to return the response output as a string
 */
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
 
/**
 * Execute the cURL session
 */
$response = curl_exec($ch );
 
/**
 * Close cURL session and file
 */
curl_close($ch );
 
echo $response; // is Welcome Maheshchari.

Handling post data on curlpost_hanlder.php 

$firstname=$_POST['fname'];
$lastname=$_POST['lname'];
echo &quot;Welcome &quot;.$firstname.$lastname;
]]> http://www.maheshchari.com/submitting-form-to-remote-server-with-array-of-parameters/feed/ 0 submit a form to remote server with php curl http://www.maheshchari.com/submit-a-form-to-remote-server-with-php-curl/ http://www.maheshchari.com/submit-a-form-to-remote-server-with-php-curl/#comments Thu, 18 Mar 2010 01:00:03 +0000 mahesh chari http://www.maheshchari.com/?p=451 Submitting form to remote server.

We learned some basics in my previous article cURL basics. Here we cover a topic how to submit a form to remote server.

To submit forms using cURL, we need to follow the below steps:

1. Prepare the data to be posted
2. Connect to the remote URL
3. Post (submit) the data
4. Fetch response and display it to the user or do some other stuff with it.

Below Example Has two files,one to post the data and other is to process the data.

/*
 * Data which is to submitted to the remote URL
 */
 
 
$post_str = urlencode("fname=mahesh&lname=chari");
 
/*
 * Initialize cURL and connect to the remote URL
 * You will need to replace the URL with your own server's URL
 * or wherever you uploaded this script to. 
 */
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://example.com/curlpost_handler.php' );
 
/*
 * Instruct cURL to do a regular HTTP POST
 */
curl_setopt($ch, CURLOPT_POST, TRUE);
 
/*
 * Specify the data which is to be posted
 */
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_str);
 
/*
 * Tell curl_exec to return the response output as a string
 */
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
 
/**
 * Execute the cURL session
 */
$response = curl_exec($ch );
 
/**
 * Close cURL session and file
 */
curl_close($ch );
 
echo $response; // is Welcome Maheshchari.

Handling post data on curlpost_hanlder.php 

$firstname=$_POST['fname'];
$lastname=$_POST['lname'];
echo "Welcome ".$firstname.$lastname;
]]> http://www.maheshchari.com/submit-a-form-to-remote-server-with-php-curl/feed/ 2 php curl basic reference http://www.maheshchari.com/php-curl-basic-reference/ http://www.maheshchari.com/php-curl-basic-reference/#comments Thu, 18 Mar 2010 00:54:50 +0000 mahesh chari http://www.maheshchari.com/?p=448 cURL basics and functions over view

cURL is a PHP library which allows you to connect and communicate to many different types of servers with many different types of protocols.Main difference is it has session capability unlik fopen. We can make small scale robot script with cURL functions in PHP.

With cURL we can:

  • Implement payment gateways’ payment notification scripts.
  • Download and upload files from remote servers.
  • Login to other websites and access members only sections.
  • Cross site communication with PHP backend and Ajax.

PHP cURL library is definitely the odd man out. Unlike other PHP libraries where a whole plethora of functions is made available, PHP cURL wraps up a major parts of its functionality with following functions.

Curl functions are:

  1. curl_close — Close a cURL session
  2. curl_copy_handle — Copy a cURL handle along with all of its preferences
  3. curl_errno — Return the last error number
  4. curl_error — Return a string containing the last error for the current session
  5. curl_exec — Perform a cURL session
  6. curl_getinfo — Get information regarding a specific transfer
  7. curl_init — Initialize a cURL session
  8. curl_multi_add_handle — Add a normal cURL handle to a cURL multi handle
  9. curl_multi_close — Close a set of cURL handles
  10. curl_multi_exec — Run the sub-connections of the current cURL handle
  11. curl_multi_getcontent — Return the content of a cURL handle if CURLOPT_RETURNTRANSFER is set
  12. curl_multi_info_read — Get information about the current transfers
  13. curl_multi_init — Returns a new cURL multi handle
  14. curl_multi_remove_handle — Remove a multi handle from a set of cURL handles
  15. curl_multi_select — Wait for activity on any curl_multi connection
  16. curl_setopt_array — Set multiple options for a cURL transfer
  17. curl_setopt — Set an option for a cURL transfer
  18. curl_version — Gets cURL version information

curl_setopt is the pivot around which the main cURL functionality revolves. cURL functioning is controlled by way of passing predefined options and values to this function.

A simple example to handle google rss feed

 
/*
*
* Initialize the cURL session
*/
$curl_handler = curl_init();
/*
*
* Set the URL of the page or file to download.
*/
curl_setopt($curl_handler, CURLOPT_URL,
'http://news.google.com/news?hl=en&topic=t&output=rss');
/*
*
* Ask cURL to return the contents in a variable
* instead of simply echoing them to the browser.
*/
curl_setopt($curl_handler, CURLOPT_RETURNTRANSFER, 1);
/*
*
* Execute the cURL session,do some stuff with content
*/
$contents = curl_exec ($curl_handler);
/*
*
* Close cURL session,
*be sure to close the handler as curl stores cookies ,other file data stores on server.
*/
curl_close ($curl_handler);

In the above example we used CURLOPT_URL,CURLOPT_RETURNTRANSFER options.

]]> http://www.maheshchari.com/php-curl-basic-reference/feed/ 2 php cron job http://www.maheshchari.com/php-cron-job/ http://www.maheshchari.com/php-cron-job/#comments Thu, 04 Feb 2010 17:01:40 +0000 mahesh chari http://www.maheshchari.com/?p=407 Setup Cron Job with PHP without crontab that runs every minute.

Cron job is scheduling some tasks with in regular interval on server.To setup cron job we must know about the cron tab commonds and shell access to remote server. generelly every hosting providers provide some programs like cPanel. Here we run a cron job that runs every mintues automatically without cron tab unix / linux demon or without any externel progams.

Generelly Cron job will run atleast four hours gap on cPanel or Plesk ,so it is not possible to setup cron job every minute unless you have crontab demon on server , SSH account on server. Here we write a simple php script that calls itself at every minute.

Remmber this cron job runs with curl php extension.

 

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//This function runs with curl extension that calls or open remote file.
function call_remote_file($url){
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);   
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_exec($ch);
curl_close($ch);
}
 
function do_somework(){
//This function to run every minutes
@mail('mahesh@gmail.com','cron job','cron runned');
}
set_time_limit(0); 
// some web hosts will have only 30 sec max execution time so we keep it unlimited time
// this function only runs if safe mode is off
$url="http://www.maheshchari.com/cronjob.php"; //it is the script that runs exactly every minutes
call_remote_file($url);
do_somework();//in mean time run some work
sleep(60); // wait the script for 60 seconds or every minute
call_remote_file($url); // call this script itself after a minute
// This process continues every minute

To stop this cron job simple remove the file from server.

With this script we don’t need

  • SSH /SFTP account
  • No need of learning cron tab commonds.
  • No script php exec permissions.
  • No need to turn off php safe mode.

Download Demo

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