Examples

Using PHP's cURL module to fetch the example.com homepage

Using PHP's cURL module to fetch the example.com homepage

Predefined Constants

Last updated: Fri, 03 Jul 2009

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Examples

ac at zwerg dot at
26-Jun-2009 11:46


If you want to write a sort of php wrapper to include the results of another http(s) request maybe pointing to a totally different site or just different code (mod_perl with HTML::Mason, in my case) into a php based layout, and just pass-thru all GET and POST variables to the sub-request, the following snippet can be used. Note there is no error handling, so this is subject to the underlying application.



<?php

$ch = curl_init($sub_req_url);

$encoded = '';

// include GET as well as POST variables; your needs may vary.

foreach($_GET as $name => $value) {

  $encoded .= urlencode($name).'='.urlencode($value).'&';

}

foreach($_POST as $name => $value) {

  $encoded .= urlencode($name).'='.urlencode($value).'&';

}

// chop off last ampersand

$encoded = substr($encoded, 0, strlen($encoded)-1);

curl_setopt($ch, CURLOPT_POSTFIELDS,  $encoded);

curl_setopt($ch, CURLOPT_HEADER, 0);

curl_setopt($ch, CURLOPT_POST, 1);

curl_exec($ch);

curl_close($ch);

?>

randearievilo at gmail dot com
16-Jun-2008 05:39


This simple code work fine using libcurl versions before 7.18.x.



<?php

        $ch = curl_init("www.example.com/curl.php?option=test");

        curl_setopt($ch, CURLOPT_HEADER, 0);

        curl_setopt($ch, CURLOPT_POST, 1);

        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

        $output = curl_exec($ch);       

        curl_close($ch);

        echo $output;

?>



If you have some trouble (Ex.: Failed to open/read local data from file/application) using a similar code with libcurl 7.18.x, try to add the option curl_setopt($ch, CURLOPT_POSTFIELDS, "").



I think there was a change in the option CURLOPT_POST. Now, to use this option, it seems to be necessary to set the option CURLOPT_POSTFIELDS.

jlee8df at gmail dot com
31-May-2008 03:21


Update to my previous code:



For every return statement, call "curl_close($ch);" or "fclose($fp);"

or both to pair up "curl_init()" and/or "fopen()".



For example:

<?php

  // ...



  // this statement:

  // if( !curl_setopt($ch, CURLOPT_URL, $url) ) return "FAIL: curl_setopt(CURLOPT_URL)";



  // should be:

  if( !curl_setopt($ch, CURLOPT_URL, $url) )

  {

    fclose($fp); // to match fopen()

    curl_close($ch); // to match curl_init()

    return "FAIL: curl_setopt(CURLOPT_URL)";

  }



  // ...

?>



- JLèé

jlee8df at gmail dot com
30-May-2008 08:47


Basic cURL file or page download with basic error trapping.



<?php



function cURLcheckBasicFunctions()

{

  if( !function_exists("curl_init") &&

      !function_exists("curl_setopt") &&

      !function_exists("curl_exec") &&

      !function_exists("curl_close") ) return false;

  else return true;

}



/*

 * Returns string status information.

 * Can be changed to int or bool return types.

 */

function cURLdownload($url, $file)

{

  if( !cURLcheckBasicFunctions() ) return "UNAVAILABLE: cURL Basic Functions";

  $ch = curl_init();

  if($ch)

  {

    $fp = fopen($file, "w");

    if($fp)

    {

      if( !curl_setopt($ch, CURLOPT_URL, $url) ) return "FAIL: curl_setopt(CURLOPT_URL)";

      if( !curl_setopt($ch, CURLOPT_FILE, $fp) ) return "FAIL: curl_setopt(CURLOPT_FILE)";

      if( !curl_setopt($ch, CURLOPT_HEADER, 0) ) return "FAIL: curl_setopt(CURLOPT_HEADER)";

      if( !curl_exec($ch) ) return "FAIL: curl_exec()";

      curl_close($ch);

      fclose($fp);

      return "SUCCESS: $file [$url]";

    }

    else return "FAIL: fopen()";

  }

  else return "FAIL: curl_init()";

}



// Download from 'example.com' to 'example.txt'

echo cURLdownload("http://www.example.com", "example.txt");



?>



- JLèé

jamespic at gmail
15-May-2008 09:24


It only needs to be writable by the web server.

promotions at jdnash dot org
08-May-2008 03:17


If executed via a web browser, the directory in which this code is located must be world writable for the file to be created.

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Using PHP's cURL module to fetch the example.com homepage

Predefined Constants

Last updated: Fri, 03 Jul 2009

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