A wave of common usage code examples of cURL library in PHP, a wave of curl

PHP’s CURL is a good function, here are a few good snippets

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;
//初始化
$ch = curl_init();
//設(shè)置選項(xiàng)，包括URL
curl_setopt($ch, CURLOPT_URL, $to_url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
//執(zhí)行并獲取HTML文檔內(nèi)容
$output = curl_exec($ch);
$output=preg_replace("#href=\"#","href=\"http://in2.qq-ex.com/amazon.php?url=",$output);
// 釋放curl句柄
curl_close($ch);
echo $output;
// 指定代理地址
curl_setopt($ch, CURLOPT_PROXY, '11.11.11.11:8080');
// 如果需要的話，提供用戶名和密碼
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. 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 printing it to the browser. 
 curl_setopt($ch, CURLOPT_URL, $url); 
 
 $data = curl_exec($ch); 
 curl_close($ch); 
 
 return $data; 
} 

3. Save all pictures under a certain 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);