How to determine if an ip within specific range or not by using php?

$lower = "0.0.0.0.0";
$upper = "255.255.255.255";
$ip = "0.0.0.10";
$lower_dec = (float)sprintf("%u",ip2long($lower));
$upper_dec = (float)sprintf("%u",ip2long($upper));
$ip_dec = (float)sprintf("%u",ip2long($ip));
if( ($ip_dec>=$lower_dec) && ($ip_dec<=$upper_dec) ){
echo "True";
}else{
echo "False";
}

How to list files in Main directory & its Sub directory in dynamically in php?

$directory = substr(DIR_BASE,0,-1);
$it = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($directory));
$i=1;
while($it->valid()) {
 if (!$it->isDot()) {
    echo "$i\n";
    echo 'SubPathName: ' . $it->getSubPathName() . "\n";
    echo 'SubPath:     ' . $it->getSubPath() . "\n";
    echo 'Key:         ' . $it->key() . "\n\n";
    $i++;
 }
 $it->next();
}

How to create Zip file using php?

$zip = new ZipArchive();
$zip_name = time().".zip"; // Zip name
$zip->open($zip_name, ZipArchive::CREATE);
$zip->addFile('test.php');
$zip->close();
header('Content-type: application/zip');
header('Content-Disposition: attachment; filename="'.$zip_name.'"');
readfile($zip_name);
unlink($zip_name);