A common usage code example for a wave of curl libraries in PHP _php instance

PHP Curl is a good feature, the following collection of a few pieces of good clips

0. Basic examples
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
$ch = Curl_init ();
Set options, including URL
curl_setopt ($ch, Curlopt_url, $to _url);
curl_setopt ($ch, Curlopt_returntransfer, 1);
curl_setopt ($ch, Curlopt_header, 0);
Executes and obtains HTML document content
$output = curl_exec ($ch);
$output =preg_replace ("#href =\", "http://in2.qq-ex.com/amazon.php?url=", "href=\", $output);
Release Curl handle
curl_close ($ch);
echo $output;
Specify proxy address
curl_setopt ($ch, Curlopt_proxy, ' 11.11.11.11:8080 ');
If necessary, provide username 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 ($domain) 
  { 
    //check, if a Val ID URL is provided 
    if (!filter_var ($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, can replace the operation of File_gecontents

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 the printing it to the browser. 
 curl_setopt ($ch, Curlopt_url, $url); 
 
 $data = curl_exec ($ch); 
 Curl_close ($ch); 
 
 return $data; 
} 

3, save all the pictures under a website

 function GetImages ($html) { 
 $matches = array (); 
 $regex = ' ~yun_qi_img/(. &~i '; 
 Preg_match_all ($regex, $html, $matches); 
 foreach ($matches [1] as $img) { 
  saveimg ($img); 
 } 
} 
 
function Saveimg ($name) { 
 $url = ' yun_qi_img/'. $name. ' JPG '; 
 $data = Get_data ($url); 
 File_put_contents (' photos/'. $name. JPG ', $data); 
} 
 
$i = 1; 
$l =; 
 
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. Send JSON data using curl

$data = Array ("name" => "Hagrid", "Age" => ")";                                   
$data _string = Json_encode ($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)))                                     
;