Foxy79

<?php

function cidr2mask($mask){
    return long2ip(pow(2,32) - pow(2, (32-$mask)));
}

function mask2cidr($mask){
    $a=strpos(decbin(ip2long($mask)),"0");
    if (!$a){$a=32;}
    return $a;

Foxy79

<?php

function num2chars($n) {	
	$cs = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
	$s = strlen($cs);
	$str = "";
	while($n) {
		$str = $cs{$n%$s}.$str;
		$n = floor($n/$s);
	}

Foxy79

<?php

function hoursDotMinutes($seconds) {
	$h = floor($seconds/3600);
	$seconds -= $h*3600;
	$m =  floor($seconds/60);
	return sprintf("%02d:%02d",$h,$m);
}

Foxy79

<?php

/*
-(bool) luhnValidate ("number");
*/

function luhnValidate($string) {
	$string = preg_replace("![^0-9]!","",$string);
	$result = "";
	foreach (str_split(strrev((string) $string)) as $i => $d) { $result .= $i %2 !== 0 ? $d * 2 : $d; }

Foxy79

<?php

function TimeRangeRusString($time1,$time2) {
	$diff = $time2-$time1;
	if ($diff==0) return "0 секунд";
	$str = array();
	if ($diff>=2592000) { $h = floor($diff/2592000); $str[] = omNumber($h, array('месяц','месяца','месяцев')); $diff-=$h*2592000; }
	if ($diff>=604800 && count($str)<1) { $h = floor($diff/604800); $str[] = omNumber($h, array('неделю','недели','недель')); $diff-=$h*604800; }
	if ($diff>=86400 && count($str)<1) { $h = floor($diff/86400); $str[] = omNumber($h, array('день','дня','дней')); $diff-=$h*86400; }
	if ($diff>=3600 && count($str)<1) { $h = floor($diff/3600); $str[] = omNumber($h, array('час','часа','часов')); $diff-=$h*3600; }