Another method of using file_get_contents ()

: This article mainly introduces another method of using file_get_contents (). If you are interested in the PHP Tutorial, refer to it. $ 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 note 1, Coentent-Type only when the value is application/x-www-data-urlencoded and 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, the corresponding data in the http request packet will be filled in the variable $ HTTP_RAW_POST_DATA 3. PHP will not fill in the corresponding data in the http request packet when the Coentent-Type is multipart/form-data: // 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 no special php settings are required. ini 6, PHP will fill in the query_path part 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; // to receive XML addresses.
 $ Data here is an array containing xml data. for details about how php parses xml data update, sendXML. php
 Xmldata'; // The xml $ url to be sent = 'http: // localhost/test/getXML. php '; // receive 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); // Set whether to return information curl_setopt ($ ch, CURLOPT_HTTPHEADER, $ header); // Set the HTTP header curl_setopt ($ ch, CURLOPT_POST, 1); // Set it to the POST method curl_setopt ($ ch, CURLOPT_POSTFIELDS, $ xml ); // POST data $ Response = curl_exec ($ ch); // receives the returned information if (curl_errno ($ ch) {// print curl_error ($ ch) when an error occurs );} curl_close ($ ch); // Close the curl link echo $ response; // display the returned information?> 2. upload images to the server using a cell phone.
 Receive files
 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 row $ raw. = "\ r \ n"; // (4) request Body $ raw. = file_get_contents ('php: // input'); return $ raw ;}

The above introduces another method of using file_get_contents (), including some content, and hopes to help friends who are interested in PHP tutorials.