Save FTP files in JSON with PHP - php

Question

I'm trying to make an array of all my ftp files. I thought that would be easy. However, I want to have an array like this:
files = [
"index.html":"_content from index.html_"
"somedir/things/server.txt":"_content from server.txt_"
"process/server.php":"_content from process.php_"
]
Is there any way to do this?
After I have this, I would like to put this array in a JSON file, that doesn't seem so hard. However, then I have things like images, which can't be saved in a JSON file right? So, I want them to download to my hard drive. How do I do that?
Thanks in advance...
UPDATE 1
This is what I just found:
<?php
$ftp_server = "ftp.example.com";
$conn_id = ftp_connect ($ftp_server)
or die("Couldn't connect to $ftp_server");
$login_result = ftp_login($conn_id, "user", "pass");
if ((!$conn_id) || (!$login_result))
die("FTP Connection Failed");
ftp_sync ("."); // Use "." if you are in the current directory
ftp_close($conn_id);
// ftp_sync - Copy directory and file structure
function ftp_sync ($dir) {
global $conn_id;
if ($dir != ".") {
if (ftp_chdir($conn_id, $dir) == false) {
echo ("Change Dir Failed: $dir<BR>\r\n");
return;
}
if (!(is_dir($dir)))
mkdir($dir);
chdir ($dir);
}
$contents = ftp_nlist($conn_id, ".");
foreach ($contents as $file) {
if ($file == '.' || $file == '..')
continue;
if (#ftp_chdir($conn_id, $file)) {
ftp_chdir ($conn_id, "..");
ftp_sync ($file);
}
else
ftp_get($conn_id, $file, $file, FTP_BINARY);
}
ftp_chdir ($conn_id, "..");
chdir ("..");
}
?>
I want to do something like this, but instead of getting the whole file, I want to get the path to the file and the content and save them in an array.