ProxyChecker

<?php
$all = file('all.txt');
/*
foreach ($all as $a) {
    $a = explode(' - ', $a)[1];
    if (trim($a)) echo $a;
}
die();

*/
$now = json_decode(file_get_contents('now.txt'));
$used = [];
$i = 0;
foreach ($all as $a) {
    $used[$i] = ['proxy' => $a];
    foreach ($now as $index=>$pack) {
        foreach (explode("\n",$pack) as $item) {
            if (strripos($item, trim($a)) !== false) {
                $used[$i]['used'][] = $index;
            }
        }
    }
    $i++;
}
foreach ($used as $us) {
    if ($us['used']) echo 'Прокси '.trim($us['proxy']).', пачки: '.json_encode($us['used'])."\n";
}