php模拟post请求发送文件

php模拟post请求发送文件

由于项目需要，需要本地服务器接收数据后，再将数据转发到另外一台服务器上，故要用到模拟post请求发送数据，当然数据中也包含文件流。

curl是php比较常用的方式之一，一般代码如下：

$params1 = test;
$params2 = @.$absolute_path;//如果是文件 则参数为@+绝对路径
$post_data = array(  
	'params1' => $params1,  
	'params2' => $params2,
);
function postData($url, $data){      
	$ch = curl_init();      
	$timeout = 300;       
	curl_setopt($ch, CURLOPT_URL, $url);   //请求地址
	//curl_setopt($ch, CURLOPT_REFERER, $ip);//构造来路    
	curl_setopt($ch, CURLOPT_POST, true);  //post请求
	curl_setopt($ch, CURLOPT_BINARYTRANSFER,true);//二进制流    
	curl_setopt($ch, CURLOPT_POSTFIELDS, $data);      //数据
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);  //当CURLOPT_RETURNTRANSFER设置为1时 $head 有请求的返回值    
	curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);    //设置请求超时时间  
	$handles = curl_exec($ch);      
	curl_close($ch);		
	return $handles;
}

$header = array(
	'Content-Type: multipart/form-data',
);
curl_setopt( $ch, CURLOPT_HTTPHEADER, $header);

后来在技术总监的帮助下，看了PHP官方网站上的一个链接http://php.net/manual/en/class.curlfile.php，参照官网做法在win wamp和centos nginx下post请求都成功了。仔细阅读了代码，发现做法竟是完整的书写了http请求的body部分，而不用curl自己生成的部分，不得不佩服。下面放出代码：

function postData($url, $data = array(), $data1 = array()){      
	$header = array(
		'Content-Type: multipart/form-data',
	);
	$ch = curl_init(); 
	curl_setopt ($ch, CURLOPT_URL, $url);
	curl_setopt( $ch, CURLOPT_HTTPHEADER, $header);
	curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1); 
	curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT,10);
	curl_setopt ($ch, CURLOPT_BINARYTRANSFER,true); 
	//curl_setopt ($ch, CURLOPT_POSTFIELDS, $data);
	curl_custom_postfields($ch, $data, $data1);
	$dxycontent = curl_exec($ch);
	curl_close($ch);
	return $dxycontent;
}

/**
* For safe multipart POST request for PHP5.3 ~ PHP 5.4.
* 
* @param resource $ch cURL resource
* @param array $assoc name => value
* @param array $files name => path
* @return bool
*/
function curl_custom_postfields($ch, array $assoc = array(), array $files = array()) {	
	// invalid characters for name and filename
	static $disallow = array(, , 
, 
);
	
	// build normal parameters
	foreach ($assoc as $k => $v) {
		$k = str_replace($disallow, _, $k);
		$body[] = implode(
, array(
			Content-Disposition: form-data; name={$k},
			,
			filter_var($v), 
		));
	}
	
	// build file parameters
	foreach ($files as $k => $v) {
		switch (true) {
			case false === $v = realpath(filter_var($v)):
			case !is_file($v):
			case !is_readable($v):
				continue; // or return false, throw new InvalidArgumentException
		}
		$data = file_get_contents($v);
		$v = call_user_func(end, explode(DIRECTORY_SEPARATOR, $v));
		$k = str_replace($disallow, _, $k);
		$v = str_replace($disallow, _, $v);
		$body[] = implode(
, array(
			Content-Disposition: form-data; name={$k}; filename={$v},
			Content-Type: application/octet-stream,
			,
			$data, 
		));
	}
	
	// generate safe boundary 
	do {
		$boundary = --------------------- . md5(mt_rand() . microtime());
	} while (preg_grep(/{$boundary}/, $body));
	
	// add boundary for each parameters
	array_walk($body, function (&$part) use ($boundary) {
		$part = --{$boundary}
{$part};
	});
	
	// add final boundary
	$body[] = --{$boundary}--;
	$body[] = ;
	
	// set options
	return @curl_setopt_array($ch, array(
		CURLOPT_POST       => true,
		CURLOPT_POSTFIELDS => implode(
, $body),
		CURLOPT_HTTPHEADER => array(
			Expect: 100-continue,
			Content-Type: multipart/form-data; boundary={$boundary}, // change Content-Type
		),
	));
}