Common usage code example of cURL library in a wave of PHP _ php instance

This article mainly introduces common code examples of cURL library usage in PHP. cURL in the Unix-like world is built in PHP, which makes Linux and MacOS users very friendly, if you need a friend, you can refer to the php CURL which is a good function. Below are some of the best clips to add to your favorites.

0. Basic example
General process:

$ To_url = $ _ GET ['url']; print_r ($ _ GET); if (substr ($ to_url, 0, 1) = '/') {$ to_url = "http://www.amazon.com ". $ to_url;} echo $ to_url; // initialize $ ch = curl_init (); // set options, including URLcurl_setopt ($ ch, CURLOPT_URL, $ to_url); curl_setopt ($ ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt ($ ch, CURLOPT_HEADER, 0); // execute and obtain the HTML document content $ output = curl_exec ($ ch ); $ output = preg_replace ("# href = \" # "," href = \ "http://in2.qq-ex.com/amazon.php? Url = ", $ output); // release curl handle curl_close ($ ch); echo $ output; // specify the proxy address curl_setopt ($ ch, CURLOPT_PROXY, '11. 11.11.11: 8080 '); // if necessary, provide the user name and password curl_setopt ($ ch, CURLOPT_PROXYUSERPWD, 'user: pass ');

1. test whether the website is running normally.

 if (isDomainAvailible('http://gz.itownet.cn'))   {     echo "Up and running!";   }   else   {     echo "Woops, nothing found there.";   }    //returns true, if domain is availible, false if not   function isDomainAvailible($domain)   {     //check, if a valid url is provided     if(!filter_var($domain, FILTER_VALIDATE_URL))     {       return false;     }      //initialize curl     $curlInit = curl_init($domain);     curl_setopt($curlInit,CURLOPT_CONNECTTIMEOUT,10);     curl_setopt($curlInit,CURLOPT_HEADER,true);     curl_setopt($curlInit,CURLOPT_NOBODY,true);     curl_setopt($curlInit,CURLOPT_RETURNTRANSFER,true);      //get answer     $response = curl_exec($curlInit);      curl_close($curlInit);      if ($response) return true;      return false;   } 

2. file_gecontents operations can be replaced.

function file_get_contents_curl($url) {  $ch = curl_init();   curl_setopt($ch, CURLOPT_HEADER, 0);  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); //Set curl to return the data instead of printing it to the browser.  curl_setopt($ch, CURLOPT_URL, $url);   $data = curl_exec($ch);  curl_close($ch);   return $data; } 

3. Save all images of a website

 function getImages($html) {  $matches = array();  $regex = '~http://somedomain.com/images/(.*?)\.jpg~i';  preg_match_all($regex, $html, $matches);  foreach ($matches[1] as $img) {   saveImg($img);  } }  function saveImg($name) {  $url = 'http://somedomain.com/images/'.$name.'.jpg';  $data = get_data($url);  file_put_contents('photos/'.$name.'.jpg', $data); }  $i = 1; $l = 101;  while ($i < $l) {  $html = get_data('http://somedomain.com/id/'.$i.'/');  getImages($html);  $i += 1; } 

4. FTP application

// open a file pointer $file = fopen("/path/to/file", "r");  // the url contains most of the info needed $url = "ftp://username:password@mydomain.com:21/path/to/new/file";  $ch = curl_init();  curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);  // upload related options curl_setopt($ch, CURLOPT_UPLOAD, 1); curl_setopt($ch, CURLOPT_INFILE, $fp); curl_setopt($ch, CURLOPT_INFILESIZE, filesize("/path/to/file"));  // set for ASCII mode (e.g. text files) curl_setopt($ch, CURLOPT_FTPASCII, 1);  $output = curl_exec($ch); curl_close($ch); 

5. Use curl to send JSON data

$data = array("name" => "Hagrid", "age" => "36");                                   $data_string = json_encode($data);                                             $ch = curl_init('http://api.local/rest/users');                                    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");                                    curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);                                  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);                                    curl_setopt($ch, CURLOPT_HTTPHEADER, array(                                        'Content-Type: application/json',                                           'Content-Length: ' . strlen($data_string))                                     );                                                             $result = curl_exec($ch);