Collecting file with PHP CURL after validating request downloads an empty file - php

Question

I am doing a system where one of my sites goes to the other to get documents.
On the first site I am using Curl to make a request to get the file wanted:
I am using the solution from Download file from URL using CURL :
function collect_file($url){
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_AUTOREFERER, false);
curl_setopt($ch, CURLOPT_REFERER, "http://example.com");
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_HEADER, 0);
$result = curl_exec($ch);
curl_close($ch);
echo $result;
return($result);
}
function write_to_file($text,$new_filename){
$fp = fopen($new_filename, 'w');
fwrite($fp, $text);
fclose($fp);
}
$curlUrl = 'http://site2.com/file-depository/14R4NP8JkoIHwIyjnexSUmyJibdpHs5ZpFs3NLFCxcs54kNhHj';
$new_file_name = "testfile-new.png";
$temp_file_contents = collect_file($curlUrl);
write_to_file($temp_file_contents,$new_file_name);
I am testing downloading an image. If i use a direct URL into $curlUrl , for instance http://site2.com/file-depository/image.png it works perfect.
What I am doing is that the URL http://site2.com/file-depository/14R4NP8JkoIHwIyjnexSUmyJibdpHs5ZpFs3NLFCxcs54kNhHj is then parsed and checked against a database to match the document requested, once there is a document matched I need to provide this document to the Curl response.
I have tried many ways to read the file but everytime i am getting a file on the other end but it is only 1kb in size (45 expected) and when trying to open it i get an error unkown file type etc.
On the second site, once the URL is validated here is what I have:
$file = readfile('some-image.png');
echo $file;
I am guessing there is part of the information which belongs to the file missing but can't figure it out, any pointers appreciated!

Answer 1

I have replaced
function write_to_file($text,$new_filename){
$fp = fopen($new_filename, 'w');
fwrite($fp, $text);
fclose($fp);
}
by file_put_contents($new_file_name,trim($temp_file_contents));
Please note the trim(), the issue was that I was apparently collecting some empty space in front of the file content.