getupdates function - js and html files

getupdates.php

// Changes to javascript functions are contained in .js files in the "$sync_path" folder
$updjs = []; // each element contains a set of synctactically correct javascript statements
$maxtime = $lastupd;  // save the most recent update sent

// List all .js files updated later than $lastupd");
foreach (scandir($sync_path) as $file) {
    if (is_dir($file) || pathinfo($file,PATHINFO_EXTENSION)!='js') continue;
    $filetime = date('Y-m-d H:i:s',filemtime("$sync_path/$file"));
    if ($filetime>$lastupd) {
        $updjs[] = file_get_contents("$sync_path/$file");
        if ($maxtime<$filetime) $maxTime = $filetime;
    }
}
   
// Changes to an HTML template are made by placing an equally-named file in the "$sync_path" folder
$updhtml = []; // each item  will contain a file name and content 
foreach (scandir($sync_path) as $file) {
    if (is_dir($file) || pathinfo($file,PATHINFO_EXTENSION)!='html') continue;
    $filetime = date('Y-m-d H:i:s',filemtime("$sync_path/$file"));
    if ($filetime>$lastupd) {
        $updhtml[] = ["name"    => $file,
                      "content" => file_get_contents("$sync_path/$file")
                     ];
        if ($maxtime <$filetime) $maxtime = $filetime;
    }
}
// Now $updjs, $updhtml and $maxtime are ready to be returned to caller