How to use php://input in PHP

php://input can read unprocessed POST data. Its usage method is such as "$xmldata = file_get_contents("php://input");", which is used to receive xml data.

The operating environment of this article: Windows 7 system, PHP version 7.1, Dell G3 computer.

How to use php://input in PHP?

As for the introduction to php://input, the PHP official manual document has a paragraph that clearly outlines it.
“php://input allows you to read raw POST data. It is a less memory intensive alternative to$HTTP_RAW_POST_DATA and does not need any special php.ini directives. php://input is not available with enctype="multipart/form-data".

Translated, it is like this:
"php://input is OK Read unprocessed POST data. Compared with $HTTP_RAW_POST_DATA, it puts less pressure on memory and does not require special php.ini settings. php://input cannot be used for enctype=multipart/form-data”
The summary is as follows:

1), Coentent-Type only takes the value application/x-www-data- In the two cases of urlencoded and multipart/form-data, PHP will fill in the corresponding data in the http request packet into the global variable $_POST

2), and when the Content-Type type is not recognized by PHP, The corresponding data in the http request packet will be filled in the variable $HTTP_RAW_POST_DATA

3). Only when the Coentent-Type is multipart/form-data, PHP will not fill in the corresponding data in the http request packet. php://input, otherwise everything else will happen. The length of the input is specified by Coentent-Length.

4), only when Content-Type is application/x-www-data-urlencoded, php:/ /input data is consistent with $_POST data.

5), php://input data is always the same as $HTTP_RAW_POST_DATA, but php://input is more efficient than $HTTP_RAW_POST_DATA and does not require special Set php.ini

6), PHP will fill in the query_path part of the PATH field into the global variable $_GET. Normally, the body of the http request submitted by the GET method is empty.

To sum up, when you cannot get the callback data from APP or some interfaces using $_POST, try using php://input

1. Accept xml data

//发送xml数据
$xml = 'xmldata';//要发送的xml 
$url = 'http://localhost/test/getXML.php';//接收XML地址 
$header = 'Content-type: text/xml';//定义content-type为xml 
$ch = curl_init(); //初始化curl 
curl_setopt($ch, CURLOPT_URL, $url);//设置链接 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);//设置是否返回信息 
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);//设置HTTP头 
curl_setopt($ch, CURLOPT_POST, 1);//设置为POST方式 
curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);//POST数据 
$response = curl_exec($ch);//接收返回信息 
if(curl_errno($ch)){//出错则显示错误信息 
print curl_error($ch); 
} 
curl_close($ch); //关闭curl链接 
echo $response;//显示返回信息 


// php用file_get_contents("php://input")或者$HTTP_RAW_POST_DATA可以接收xml数据
$xmldata = file_get_contents("php://input"); 
$data = (array)simplexml_load_string($xmldata);

2. A small program for uploading pictures to the server from your mobile phone
Send

//@file phpinput_post.php 
$data=file_get_contents('btn.png'); 
$http_entity_body = $data; 
$http_entity_type = 'application/x-www-form-urlencoded'; 
$http_entity_length = strlen($http_entity_body); 
$host = '127.0.0.1'; 
$port = 80; 
$path = '/image.php'; 
$fp = fsockopen($host, $port, $error_no, $error_desc, 30); 
if ($fp){ 
fputs($fp, "POST {$path} HTTP/1.1\r\n"); 
fputs($fp, "Host: {$host}\r\n"); 
fputs($fp, "Content-Type: {$http_entity_type}\r\n"); 
fputs($fp, "Content-Length: {$http_entity_length}\r\n"); 
fputs($fp, "Connection: close\r\n\r\n"); 
fputs($fp, $http_entity_body . "\r\n\r\n"); 

while (!feof($fp)) { 
 $d .= fgets($fp, 4096); 
} 
fclose($fp); 
echo $d; 
}

Receive

/**
 *Recieve image data
 **/
error_reporting(E_ALL);

function get_contents() {
 $xmlstr= file_get_contents("php://input");
 $filename=file_put_contentsxmltime().'.png';
 if(($filename,$str)){
 echo 'success';
 }else{
 echo 'failed';
 } 
  }
get_contents();

3: Obtain the original text of the HTTP request

/**
 * 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;
}

The above are three small chestnuts for PHP input flow, the purpose is to help everyone more I hope you can gain an accurate understanding of the PHP input stream.

Recommended study: "PHP Video Tutorial"

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