For the introduction to php://input, the official PHP 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 can 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 applies when the value is application/x-www-data-urlencoded and multipart/form-data In this case, PHP will fill in the corresponding data in the http request packet into the global variable $_POST

2). When the Content-Type type is not recognized by PHP, it will fill in the corresponding data in the http request packet into 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 into php://input, otherwise the length will be filled in in other cases. Specified by Coentent-Length.

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

5), php://. The 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 settings for php.ini

6). PHP will fill 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 the APP or some interfaces using $_POST, try using php://input. Try

1. Accept xml data

//發(fā)送xml數(shù)據(jù)
$xml = &#39;<xml>xmldata</xml>&#39;;//要發(fā)送的xml 
$url = &#39;http://localhost/test/getXML.php&#39;;//接收XML地址 
$header = &#39;Content-type: text/xml&#39;;//定義content-type為xml 
$ch = curl_init(); //初始化curl 
curl_setopt($ch, CURLOPT_URL, $url);//設(shè)置鏈接 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);//設(shè)置是否返回信息 
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);//設(shè)置HTTP頭 
curl_setopt($ch, CURLOPT_POST, 1);//設(shè)置為POST方式 
curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);//POST數(shù)據(jù) 
$response = curl_exec($ch);//接收返回信息 
if(curl_errno($ch)){//出錯(cuò)則顯示錯(cuò)誤信息 
print curl_error($ch); 
} 
curl_close($ch); //關(guān)閉curl鏈接 
echo $response;//顯示返回信息 
 
 
// php用file_get_contents("php://input")或者$HTTP_RAW_POST_DATA可以接收xml數(shù)據(jù)
$xmldata = file_get_contents("php://input"); 
$data = (array)simplexml_load_string($xmldata);

2. Mini program for uploading pictures to the server via 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: Get the original text of the HTTP request

/**
 * 獲取HTTP請(qǐng)求原文
 * @return string
 */
function get_http_raw(){
 $raw = '';
 // (1) 請(qǐng)求行 
 $raw .= $_SERVER['REQUEST_METHOD'] . ' ' . $_SERVER['REQUEST_URI'] . ' ' . $_SERVER['SERVER_PROTOCOL'] . "\r\n";
 // (2) 請(qǐng)求Headers 
 foreach ($_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) 請(qǐng)求Body 
 $raw .= file_get_contents('php://input');
 return $raw;
}

The above are three small programs for PHP input flow Chestnut, the purpose is to help everyone understand the PHP input stream more accurately. I hope you will gain something.

For more relevant articles on the PHP input stream php://input, please pay attention to the PHP Chinese website!