How to get the image extention from function file_get_content() - php

Question

I have a url something like this
$url ="www.domain.com/image.php?id=123&idlocation=987&number=01";
Previously i was getting the extension using following code
$img_details= pathinfo($url);
But this won't work any more since the url has other variables also . So in this case how to get the Image name and extension .
I know i should first download the file using
$contenido = file_get_contents($url);
But don't know how to get the files name/extention from this
Thanks in advance

Answer 1

$ch = curl_init();
$url = 'http://www.domain.com/image.php?id=123&idlocation=987&number=01';
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_NOBODY, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$results = split("\n", trim(curl_exec($ch)));
foreach($results as $line) {
if (strtok($line, ':') == 'Content-Type') {
$parts = explode(":", $line);
echo trim($parts[1]);
}
}
Return: image/png
Already answered in: Get mime type of external file using cURL and php

Answer 2

The above answers focus both on the mime-type and they will work in most cases they both need additional resource usage - either a second network call to get the mime type or more disk reads/writes to save the file to disk and use the exif-imagetype function. And both will not return the file name which was a part of the question. Here is a download function using curl that will return a downloaded file as an array with name,mime type and content. Additionally it will try to get the name from the URL if possible.
Sample usage
$file=downloadfile($url);
echo "Name: ".$file["name"]."<br>";
echo "Type: ".$file["mimetype"]."<br>";
Code
function downloadfile($url){
global $headers;
$headers=array();
$file=array("content"=>"","mimetype"=>"","name"=>"");
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_HEADERFUNCTION, 'readHeaders');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$file["content"]=curl_exec($ch);
if(sizeof($headers)){
foreach($headers as $header){
if(!strncasecmp($header,'content-type:',13)){
$file["mimetype"]=trim(substr($header,13));
}
elseif(!strncasecmp($header,'content-disposition:',20)){
$file["name"]=trim(substr(strstr($header,'filename='),9));
}
}
}
if(!$file["name"]){
$query=strpos("?",$url);
$file["name"]=basename(substr($url,0,($query?$query:strlen($url))));
}
unset($headers);
return $file;
}
function readHeaders($ch, $header) {
global $headers;
array_push($headers, $header);
return strlen($header);
}