一波PHP中cURL库的常见用法代码示例，一波curl

一波PHP中cURL库的常见用法代码示例，一波curl

php 的CURL是不错的功能,下面收藏几段不错的片段

0、基本例子
一般流程:

$to_url=$_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
$ch = curl_init();
//设置选项，包括URL
curl_setopt($ch, CURLOPT_URL, $to_url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
//执行并获取HTML文档内容
$output = curl_exec($ch);
$output=preg_replace("#href=\"#","href=\"http://in2.qq-ex.com/amazon.php?url=",$output);
// 释放curl句柄
curl_close($ch);
echo $output;
// 指定代理地址
curl_setopt($ch, CURLOPT_PROXY, '11.11.11.11:8080');
// 如果需要的话，提供用户名和密码
curl_setopt($ch, CURLOPT_PROXYUSERPWD,'user:pass');

1、测试网站是否运行正常

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、可以代替file_gecontents的操作

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、保存某个网站下的所有图片

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应用

// 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、使用curl发送JSON数据

$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);