PHP 中cURL详解说明

function curl_get($url=''){
	//初始化一个cURL会话
	$ch = curl_init();
	curl_setopt_array($ch, [
		//作用是让curl_exec返回字符串,而不是直接输出
		CURLOPT_RETURNTRANSFER => true,
		CURLOPT_URL => $url
	]);
	$result = curl_exec($ch);
	curl_close($ch);
	return $result;
}
echo curl_get('http://www.example.com/');

function curl_post($url,$data=[]){
	$ch = curl_init();
	curl_setopt_array($ch,[
		CURLOPT_POST => true,
		CURLOPT_RETURNTRANSFER => true,
		CURLOPT_URL => $url,
		CURLOPT_POSTFIELDS => $data
	]);
	$result = curl_exec($ch);
	curl_close($ch);
	return $result;
}

$post = curl_post('http://httpbin.org/post',['username'=>'vace','age'=>23]);

print_r($post);

function curl_auth($url,$user,$passwd){
	$ch = curl_init();
	curl_setopt_array($ch, [
		CURLOPT_USERPWD => $user.':'.$passwd,
		CURLOPT_URL     => $url,
		CURLOPT_RETURNTRANSFER => true
	]);
	$result = curl_exec($ch);
	curl_close($ch);
	return $result;
}

$authurl = 'http://httpbin.org/basic-auth/vace/passwd';

echo curl_auth($authurl,'vace','passwd');

/**
 * [curl_cookies 使用curl发送和保存cookies]
 * @param  [type] $url       [访问URL]
 * @param  [type] $save_path [cookies的保存地址]
 * @return [type]            [设置cookies后的内容]
 */
function curl_cookies($url,$save_path){
	$ch = curl_init();
	curl_setopt_array($ch, [
		CURLOPT_RETURNTRANSFER => true,
		CURLOPT_URL => $url,
		CURLOPT_COOKIEJAR => $save_path,
		CURLOPT_COOKIEFILE => $save_path
	]);
	$result = curl_exec($ch);
	curl_close($ch);

	return $result;
}
echo curl_cookies('http://httpbin.org/cookies/set?cookie1=vace','./cookies.log');

/**
 * [curl_download 下载远程文件]
 * @param  [type] $url      [远程地址]
 * @param  [type] $savename [保存本地文件名]
 * @return [type]           [description]
 */
function curl_download($url,$savename){
	$fp = fopen($savename, 'w');
	$ch = curl_init($url);
	curl_setopt_array($ch, [
		CURLOPT_FILE => $fp,
		CURLOPT_HEADER => 0
	]);
	curl_exec($ch);
	curl_close($ch);
	fclose($fp);
}

curl_download('http://httpbin.org/image/png','./down.png');

//1.构造一个简单的 get 请求,抓取 http://www.example.com/ 的页面内容
echo Curl::get('http://www.example.com/')->send();
//2.构造一个简单的 post 请求,提交username和age到指定页面
print_r( Curl::post('http://httpbin.org/post')->setData(['username'=>'vace','age'=>23])->send() );
//3.HTTP 认证连接
echo Curl::get('http://httpbin.org/basic-auth/vace/passwd')->setAuth('vace','passwd')->send();
//4.使用cURL获取cookies并保存到本地
echo Curl::get('http://httpbin.org/cookies/set?cookie1=vace')->useCookies('./cookies.log')->send();
//5.下载一张图片到本地
Curl::get('http://httpbin.org/image/png')->download('./test.png')->send();

class Curl{
	/**
	 * [__callStatic 调用方法请求数据]
	 * @param  [type] $method [allMethod key]
	 * @param  [type] $url    [请求url地址]
	 * @return [type]         [Curl对象]
	 */
	public static function __callStatic($method,$url){
		$methods = static::$allMethod;
		if(!array_key_exists($method, $methods)){
			throw new \InvalidArgumentException("Method {$method} not valid HTTP method", 1);	
		}
		return new self($method,$url[0]);
	}
	/**
	 * [$allMethod 全部访问方法]
	 * @var [array]
	 */
	public static $allMethod = [
		'get'     => false,
		'head'    => false,
		'post'    => true,
		'put'     => true,
		'patch'   => true,
		'delete'  => false,
		'options' => false
	];
	/**
	 * [$url 请求url]
	 * @var [string]
	 */
	private $url;
	/**
	 * [$method 请求方法]
	 * @var [string]
	 */
	private $method;
	/**
	 * [$headers curl header]
	 * @var [array]
	 */
	private $headers = [];
	/**
	 * [$cookies cookies信息]
	 * @var [array]
	 */
	private $cookies = [];
	/**
	 * [$data 设置数据]
	 * @var [type]
	 */
	private $data = [];

	/**
	 * [$option curl opt 参数]
	 * @var array
	 */
	private $option = [];

	/**
	 * [$auth 认证信息]
	 * @var array
	 */
	private $auth = false;
	/**
	 * [$ch curl_init 句柄]
	 * @var [type]
	 */
	private $ch;
	private function __construct($method,$url){
		$this->url = $url;
		$this->method = $method;
	}

	public function getUrl(){
		return $this->url;
	}

	public function getMethod(){
		return $this->method;
	}

	/**
	 * [setHeader 设置header,(key,value),('key:value')]
	 * @param [type] $key   [header 名称]
	 * @param [type] $value [值]
	 */
	public function setHeader($key,$value=null){
		if(null === $value){
			list($key,$value) = explode(':', $key);
		}
		$this->headers[ strtolower($key) ] = $value;
		return $this;
	}

	/**
	 * [setHeaders 批量设置header]
	 * @param array $headersArr [description]
	 */
	public function setHeaders(array $headersArr = []){
		foreach ($headersArr as $key => $value) {
			$this->setHeader($key,$value);
		}
		return $this;
	}

	/**
	 * [setCookie 设置cookies]
	 * @param [type] $key   [key=value,(key,value)]
	 * @param [type] $value [description]
	 */
	public function setCookie($key,$value=null){
		if(null === $value){
			list($key,$value) = explode('=', $key);
		}
		$this->cookies[ strtolower($key) ] = $value;
		return $this;
	}

	/**
	 * [setCookies 批量设置cookies]
	 * @param array $headersArr [description]
	 */
	public function setCookies(array $headersArr = []){
		foreach ($headersArr as $key => $value) {
			$this->setCookie($key,$value);
		}
		return $this;
	}

	public function setData($data){
		$this->data = array_merge($this->data,$data);
		return $this;
	}

	public function setOption($key,$value){
		$this->option[$key] = $value;
		return $this;
	}

	public function setOptions(array $data = []){
		$this->option = array_merge($this->option,$data);
		return $this;
	}

	public function setAuth($user,$passwd=null){
		if(null === $user){
			list($user,$passwd) = explode(':', $user);
		}
		$this->auth = $user . ':' . $passwd;
		return $this;

	}

	private $cookies_path=false;
	public function useCookies($cookiesPath=''){
		$this->cookies_path = $cookiesPath;
		return $this;
	}

	private $download_file = false;
	public function download($filename){
		$this->download_file = $filename;
		return $this;
	}
	private $json = false;
	public function json(boolean $bool){
		$this->json = $bool;
		return $this;
	}

	public function send(){
		$this->ch = curl_init();

		$strings = [];
		foreach ($this->cookies as $key => $value) {
			$strings[] = "{$key}={$value}";
		}
		if(!empty($strings)) $this->setHeader('cookie',implode(';', $strings));


		$option = [
			CURLOPT_RETURNTRANSFER => true,
			CURLOPT_HEADER => false,
			CURLOPT_URL => $this->url,
			CURLOPT_HTTPHEADER => $this->headers
		];

		$method = $this->method;

		if ($method === 'post') {
			$option[CURLOPT_POST] = true;
		} elseif ($method !== 'get') {
			$option[CURLOPT_CUSTOMREQUEST] = $method;
		}


		//auth
		if(false !== $this->auth){
			$option[CURLOPT_USERPWD] = $this->auth;
		}

		//postdata
		if (static::$allMethod[$method] === true) {
			$option[CURLOPT_POSTFIELDS] = $this->data;
		}

		//cookies
		if(false !== $this->cookies_path){
			$option[CURLOPT_COOKIEJAR] = $option[CURLOPT_COOKIEFILE] = $this->cookies_path;
		}
		//download
		$filename = $this->download_file;
		if($filename){
			if(!$filename) throw new \Exception("use ->download(filename)", 1);
			$fp = fopen($filename, 'w');
			$option[ CURLOPT_FILE ] = $fp;
		}

		//合并配置
		$option = $option + $this->option;
		curl_setopt_array($this->ch,$option);

		$result = curl_exec($this->ch);

		curl_close($this->ch);
		if($filename){
			fclose($fp);
		}
		return $result;
	}
}