$_SERVER['REQUEST_METHOD'].' '.$_SERVER['REQUEST_URI'].' '.$_SERVER['SERVER_PROTOCOL']."\r\n"; 

function get_all_headers() { 
$headers = array(); 

foreach($_SERVER as $key => $value) { 
if(substr($key, 0, 5) === 'HTTP_') { 
$key = substr($key, 5); 
$key = strtolower($key); 
$key = str_replace('_', ' ', $key); 
$key = ucwords($key); 
$key = str_replace(' ', '-', $key); 

$headers[$key] = $value; 
} 
} 

return $headers; 
} 

file_get_contents('php://input') 

/** 
* 获取HTTP请求原文 
* @return string 
*/ 
function get_http_raw() { 
$raw = ''; 

// (1) 请求行 
$raw .= $_SERVER['REQUEST_METHOD'].' '.$_SERVER['REQUEST_URI'].' '.$_SERVER['SERVER_PROTOCOL']."\r\n"; 

// (2) 请求Headers 
foreach($_SERVER as $key => $value) { 
if(substr($key, 0, 5) === 'HTTP_') { 
$key = substr($key, 5); 
$key = str_replace('_', '-', $key); 

$raw .= $key.': '.$value."\r\n"; 
} 
} 

// (3) 空行 
$raw .= "\r\n"; 

// (4) 请求Body 
$raw .= file_get_contents('php://input'); 

return $raw; 
}