Download Image with Extension from URL using cURL php - php

Question

I am trying to download GooglePlay app's icons from links provided.
eg. https://lh5.ggpht.com/j0y0xf18PF8iZ_qyKekah11Gg7fteqhqm_VC0SQg7oMsIyMPato7Z_zBsGmOtTf2Fw=w300
now when i am downloading the image, using cURL, using the following code
function scaleImageAndSaveIt($appName,$imageURL){
$format="_%d_%m_%Y_%H_%M_%S";
$strf=strftime($format);
$imageLocnName = $appName . $strf ;
$ch = curl_init($imageURL);
$fp = fopen($imageLocnName, 'wb');
curl_setopt($ch, CURLOPT_FILE, $fp);
curl_setopt($ch, CURLOPT_HEADER, true);
$resp = curl_exec($ch);
echo $resp;
curl_close($ch);
fclose($fp);
return $imageLocnName; }
Now when i am try to save image, i do not have any file extension. (.png, or .jpg or anything else). Though, when i manually save the image, i get the image extension as PNG.
How do i either download the image with default image name and extension or how can I find the extension. Any of the solution would be helpful for me.

Answer 1

try something like this, and based on the return value decide which extension to use:
function GetMimeType($path)
{
//$type = mime_content_type($file); //deprecated
/* //file info -> normal method, but returns wrong values for ics files..
$finfo = finfo_open(FILEINFO_MIME_TYPE); // return mime type ala mimetype extension
$type = $filename.":".finfo_file($finfo, $filename);
finfo_close($finfo);
*/
$forbiddenChars = array('?', '*', ':', '|', ';', '<', '>');
if(strlen(str_replace($forbiddenChars, '', $path)) < strlen($path))
throw new \Exception("Forbidden characters!");
$path = escapeshellarg($path);
ob_start();
$type = system("file --mime-type -b ".$path);
ob_clean();
return $type;
}
function GuessExtension($path)
{
$type = GetMimType($path);
$extension = "";
switch($type)
{
case "image/png":
$extension = ".png";
break;
case "image/jpeg":
default:
$extension = ".jpg";
break;
}
}
//use it like this:
var_dump(GuessExtension("/path/to/your/saved/file"));