Helper.php

<?php

namespace CleantalkSP\Common\Helpers;

class Helper
{
    /**
     * Resolve DNS to a single IP-address
     *
     * @param string $host
     * @param bool $out
     *
     * @return bool
     */
    public static function resolveDNS($host, $out = false)
    {
        // Get DNS records about URL
        if (function_exists('dns_get_record')) {
            $records = @dns_get_record($host, DNS_A);
            if ($records !== false) {
                $out = $records[0]['ip'];
            }
        }

        // Another try if first failed
        if ( ! $out && function_exists('gethostbynamel')) {
            $records = gethostbynamel($host);
            if ($records !== false) {
                $out = $records[0];
            }
        }

        return $out;
    }

    /**
     * Return the start of the given time interval in seconds
     *
     * @param int $interval Duration of the interval
     *
     * @return int
     */
    public static function getTimeIntervalStart($interval = 300)
    {
        return time() - ((time() - strtotime(date('d F Y'))) % $interval);
    }

    /**
     * Validate date format Y-m-d
     *
     * @return boolean
     */
    public static function dateValidate($date)
    {
        $date_arr = explode('-', $date);

        if (count($date_arr) === 3) {
            if (checkdate((int) $date_arr[1], (int) $date_arr[2], (int) $date_arr[0])) {
                return true;
            }
        }

        return false;
    }

    /**
     * Returns true if $signature is regexp, else return false. Supports modifications set [imSsxADUuXJ].
     *
     * @param string $signature - signature expression from DB
     * @param string $delimiters - delimiters for regexp. Default set is '#/'. Do not use @ symbol as delimiter.
     *
     * @return bool
     */
    public static function isRegexp($signature, $delimiters = '#/')
    {
        $pattern_modifiers = '[imSsxADUuXJ]{0,11}';
        $limit             = strlen($delimiters) - 1;
        for ( $i = 0; $i <= $limit; $i++ ) {
            $pattern = '@^' . $delimiters[$i] . '.*' . $delimiters[$i] . $pattern_modifiers . '$@';
            if ( preg_match($pattern, $signature) ) {
                return true;
            }
        }

        return false;
    }

    /**
     * Returns number of string with a given char position
     *
     * @param string $file_path String to search in
     * @param string $signature_body Character position
     * @param bool $is_regexp Flag. Is signature is regular expression?
     *
     * @return array Array of lines number with needle
     */
    public static function getNeedleStringsNumberFromFile($file_path, $signature_body, $is_regexp = false)
    {
        $file = file($file_path);
        $out_line_numbers = array();

        foreach ( $file as $number => $line ) {
            if (
                ($is_regexp && preg_match($signature_body, $line)) ||
                ( ! $is_regexp && strripos($line, stripslashes($signature_body)) !== false)
            ) {
                $out = $number + 1;
                $out_line_numbers[] = $out;
            }
        }

        return $out_line_numbers;
    }
}