I'd like to ask, little brother. How to get a picture from a URL, popular point is to get a picture through get

I'd like to ask. How to get a picture through a URL, popular point is how to get the image by get?
The company's iOS says he can only encapsulate the picture as a stream of data, then pass it through the parameters, and then the parameters are too long for the problem to pass.
I would like to ask, this is my technical problem, very much hurt Ah, I am a fresh graduate.
In the school four years have not heard can use Gey way to preach pictures, is I see too short?

I said I was powerless, everyone thought I was to spray iOS, then spray me, by the way to get a solution to the way, kneeling thanks.
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Did not hear, wait for the bull, get maximum only 1024 bytes, and so the cattle people to solve
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No iOS, but I'm guessing it's not through get.

Reference Manual for: php://input
------Solution--------------------
Post is OK?
A lot of ready-made code online

 Class Image {
Const ROOT_PATH = './';
Const FAIL_WRITE_DATA = ' FAIL to WRITE DATA ';
No Data flow
Const NO_STREAM_DATA = ' The post DATA is empty ';
The picture type is not correct
Const NOT_CORRECT_TYPE = ' Not a CORRECT image TYPE ';
Cannot create file
Const Can_not_create_file = ' CAN not ' CREATE FILE ';
Upload image Name
Public $image _name;
Picture Save name
Public $save _name;
Picture Save Path
Public $save _dir;
Catalog + Picture Full path
Public $save _fullpath;
      
/**
* Constructor function
* @param String $save _name Save picture name
* @param String $save _dir Save path name
*/
Public function __construct ($save _name, $save _dir) {
Set_error_handler ($this->error_handler ());
          
Set Save picture name, if not set, randomly generate a unique file name
$this->save_name = $save _name? $save _name:md5 (Mt_rand (), uniqid ());
Set save picture Path, if not set, use year/month/day format for directory storage
$this->save_dir = $save _dir? Self::root_path. $save _dir:self::root_path. Date (' y/m/d ');
           
Create a folder
@ $this->create_dir ($this->save_dir);
Set directory + picture full path
$this->save_fullpath = $this->save_dir. '/' . $this->save_name;
}
Compatible with PHP4
Public function image ($save _name) {
$this->__construct ($save _name);
}
      
Public Function Stream2image ($data) {
Binary Data Flow
$data = file_get_contents (' Php://input ')? file_get_contents (' Php://input '): gzuncompress ($GLOBALS [' http_raw_post_data ']);
The data stream is not empty, then the save operation
if (! empty ($data)) {
Create and write a data stream, and then save the file
if (@ $fp = fopen ($this->save_fullpath, ' w+ ')) {
Fwrite ($fp, $data);
Fclose ($FP);
$baseurl = "http://". $_server ["SERVER_NAME"]. ":" . $_server ["Server_port"]. DirName ($_server ["Script_name"]). '/' . $this->save_name;
if ($this->getimageinfo ($baseurl)) {
Echo $baseurl;
} else {
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