How to Use thinkphp in the app to upload images

In the last appIOS real-name authentication using the thinkphp write interface, you must upload a picture of yourself. How can I use thinkphp to write the upload image? Is there any source code? Please note every step. Thank you !! You must upload an image of your own for real-name authentication using the thinkphp write interface of the latest IOS app.
Thank you very much for every step of writing source code to upload images using thinkphp !!

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You must upload an image of your own for real-name authentication using the thinkphp write interface of the latest IOS app.
Thank you very much for every step of writing source code to upload images using thinkphp !!

// The upload image method can be placed in the parent class for future inheritance and direct calling
// Two upload Methods: file and base64

Public function picupload () {if (! IS_POST) {die ('');} // base64 upload mode (mainly for processing input file not supported) $ smeta =$ _ POST ['smeta ']; if (preg_match ('/^ (data: \ s * image \/(\ w +); base64,)/', $ smeta, $ result )) {// base64 upload $ data = base64_decode (str_replace ($ result [1], '', $ smeta); $ dataname = '. /Uploads /'. uniqid (). '. '. $ result [2]; if (file_put_contents ($ dataname, $ data) {$ this-> ajaxoutput ($ dataname ); // The returned data structure is self-encapsulated} else {$ this-> ajaxerror ('upload error ');} // Process file Upload. Here we call thinkphp to encapsulate \ Think \ Upload. You can learn how to write the thinkphp official class. $ config = array ('rootpath' => '. /Uploads/', 'savepath' => '', 'maxsize' => 11048576, 'savename' => array ('uniqid ',''), 'exts' => array ('jpg ', 'gif', 'png', 'jpeg '), 'autosub' => false ,); $ upload = new \ Think \ Upload ($ config); // $ info = $ upload-> upload (); // start to upload if ($ info) {// uploaded successfully $ first = array_shift ($ info); if (! Empty ($ first ['url']) {$ url = $ first ['url'];} else {$ url = C ("tmpl_parse_string.w.upload __"). $ first ['savename'];} $ this-> ajaxoutput ($ url);} else {// Upload Failed, returned error $ this-> ajaxerror ($ upload-> getError ());}}

App post
And then $ _ FILES in php receive, there is no special