Generate advanced apt mirror.txt file for sources.list, supports different mirrorlist sources (from different locations, etc.) and host/path filtering

mirrors.php

<?php
//error_reporting(E_ALL);
//ini_set('display_errors', '1');
$locations = ['mirrors', 'SE', 'FI']; //locations to download lists for, mirrors is for local mirrors.txt by GeoIP, not always fastest servers
$substrings = ["truenetwork.ru", "linux-ia64.org", "powernet.com.ru", "timeweb.ru", "yandex", "hyperdedic.ru"]; //substrings of mirror URLs to exclude
$filteredLines = ["http://mirrors.linode.com/ubuntu/".PHP_EOL,"http://mirrors.digitalocean.com/ubuntu/".PHP_EOL]; //array definition to add mirrors to output

foreach ($locations as $location){
$url = 'http://mirrors.ubuntu.com/'.$location.'.txt';
$cache_file = '/tmp/mirrors_'.$location;
if (file_exists($cache_file) && (filemtime($cache_file) > (time() - 60 * 60 * 24 ))) {
   // Cache file is less than 24 hours old. 
   // Don't bother refreshing, just use the file as-is.
   $file = file($cache_file);
} else {
   // Our cache is out-of-date, so load the data from our remote server,
   // and also save it over our cache for next time.
   $file = file($url);
   if($file){//Do not cache empty file (e.g. download error)
   file_put_contents($cache_file, $file, LOCK_EX);}
}
foreach($file as $line){
    // Check if the line contains any of the substrings
    $containsSubstring = false;
    foreach ($substrings as $substring) {
        if (strpos($line, $substring) !== false) {
            $containsSubstring = true;
            break;
        }
    }

    // If the line contains any substring, skip it
    if ($containsSubstring) {
        continue;
    }
  
  //Replace https with http for better performance or http with https for better security
  $line = str_replace('https://', 'http://', $line);
  
    // Add the line to the filtered array
    $filteredLines[] = $line;
}
}
echo implode('', $filteredLines);