File_get_contents ("php: // input") usage

File_get_contents (php: input) usage $ data = file_get_contents ("php: // input ");

Php: // input is a read-only stream that can access the requested raw data.
In the case of POST requests, it is best to use php: // input instead of $ HTTP_RAW_POST_DATA, because it does not rely on specific php. ini commands.
In this case, $ HTTP_RAW_POST_DATA is not filled by default, which requires less memory than activating always_populate_raw_post_data.
When enctype = "multipart/form-data", php: // input is invalid.


1. php: // input can read the value of the specified Length in the http entity body, which is determined by Content-Length, whether it is data submitted by POST or GET methods. However, when the GET method submits data, the http request entity body is empty.
2. php: // input and $ HTTP_RAW_POST_DATA read the same data and only read data whose Content-Type is not multipart/form-data.

Study Notes
1. Coentent-Type can only be set to application/x-www-data-urlencoded or multipart/form-data, PHP will fill in the corresponding data in the http request packet with the global variable $ _ POST
2. when PHP cannot recognize the Content-Type, it will fill in the corresponding data in the http request package with the variable $ HTTP_RAW_POST_DATA
3. when the Coentent-Type is multipart/form-data, PHP will not fill in the corresponding data in the http request packet in php: // input; otherwise, it will be used in other cases. Length specified by Coentent-Length.
4. php: // input data is consistent with $ _ POST data only when the Content-Type is application/x-www-data-urlencoded.
5. php: // the input data is always the same as $ HTTP_RAW_POST_DATA, but php: // the input data is more efficient than $ HTTP_RAW_POST_DATA, and php. ini does not require special settings.
6. PHP will fill in the query_path section of the PATH field with the global variable $ _ GET. Normally, the http request submitted by the GET method has no body.

Example
1. php uses file_get_contents ("php: // input") or $ HTTP_RAW_POST_DATA to receive xml data.
For example:
GetXML. php; // receives the XML address

$ Xmldata = file_get_contents ("php: // input ");
$ Data = (array) simplexml_load_string ($ xmldata );
?>

$ Data here is an array containing xml data. the detailed method for php to parse xml data updates
SendXML. php

$ Xml =' Xmldata '; // The xml to be sent
$ Url = 'http: // localhost/test/getXML. php'; // receives the XML address

$ Header = 'content-type: text/XML'; // Define Content-type as xml
$ Ch = curl_init (); // initialize curl
Curl_setopt ($ ch, CURLOPT_URL, $ url); // Set the link
Curl_setopt ($ ch, CURLOPT_RETURNTRANSFER, 1); // Sets whether to return information.
Curl_setopt ($ ch, CURLOPT_HTTPHEADER, $ header); // sets the HTTP header
Curl_setopt ($ ch, CURLOPT_POST, 1); // Set it to POST
Curl_setopt ($ ch, CURLOPT_POSTFIELDS, $ xml); // POST data
$ Response = curl_exec ($ ch); // receives the returned information
If (curl_errno ($ ch) {// error message displayed
Print curl_error ($ ch );
}
Curl_close ($ ch); // Close the curl link
Echo $ response; // display the returned information
?>

2. a cell phone uploads images to the server.
Upload files

// @ File phpinput_post.php
Using 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 = '1970. 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 ");
Fputs ($ fp, $ http_entity_body. "\ r \ n ");

While (! Feof ($ fp )){
$ D. = fgets ($ fp, 4096 );
}
Fclose ($ fp );
Echo $ d;
}
?>

Receive files

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

Function get_contents (){
$ Xmlstr = file_get_contents ("php: // input ");
Using filename1_time().'.png ';
If (file_put_contents ($ filename, $ xmlstr )){
Echo 'success ';
} Else {
Echo 'failed ';
}
}
Get_contents ();
?>
3. get the original HTTP request

/**
* Get the original HTTP request
* @ Return string
*/
Function get_http_raw (){
$ Raw = '';

// (1) request line
$ Raw. = $ _ SERVER ['request _ method']. ''. $ _ SERVER ['request _ URI ']. ''. $ _ SERVER ['server _ protocol']. "\ r \ n ";

// (2) request 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) empty rows
$ Raw. = "\ r \ n ";

// (4) request Body
$ Raw. = file_get_contents ('php: // input ');

Return $ raw;
}