RRule\RRule::humanReadable PHP Method

    public function humanReadable(array $opt = array())
    {
        if (self::$intl_loaded === null) {
            self::$intl_loaded = extension_loaded('intl');
        }
        // attempt to detect default locale
        if (self::$intl_loaded) {
            $locale = \Locale::getDefault();
        } else {
            $locale = setlocale(LC_MESSAGES, 0);
            if ($locale == 'C') {
                $locale = 'en';
            }
        }
        $default_opt = array('locale' => $locale, 'date_formatter' => null, 'fallback' => 'en');
        if (self::$intl_loaded) {
            $default_opt['date_format'] = \IntlDateFormatter::SHORT;
            if ($this->freq >= self::SECONDLY || not_empty($this->rule['BYSECOND'])) {
                $default_opt['time_format'] = \IntlDateFormatter::LONG;
            } elseif ($this->freq >= self::HOURLY || not_empty($this->rule['BYHOUR']) || not_empty($this->rule['BYMINUTE'])) {
                $default_opt['time_format'] = \IntlDateFormatter::SHORT;
            } else {
                $default_opt['time_format'] = \IntlDateFormatter::NONE;
            }
        }
        $opt = array_merge($default_opt, $opt);
        if ($opt['date_formatter'] && !is_callable($opt['date_formatter'])) {
            throw new \InvalidArgumentException('The option date_formatter must callable');
        }
        if (!$opt['date_formatter']) {
            if (self::$intl_loaded) {
                $formatter = \IntlDateFormatter::create($opt['locale'], $opt['date_format'], $opt['time_format'], $this->dtstart->getTimezone()->getName());
                $opt['date_formatter'] = function ($date) use($formatter) {
                    return $formatter->format($date);
                };
            } else {
                $opt['date_formatter'] = function ($date) {
                    return $date->format('Y-m-d H:i:s');
                };
            }
        }
        $i18n = self::i18nLoad($opt['locale'], $opt['fallback']);
        $parts = array('freq' => '', 'byweekday' => '', 'bymonth' => '', 'byweekno' => '', 'byyearday' => '', 'bymonthday' => '', 'byhour' => '', 'byminute' => '', 'bysecond' => '', 'bysetpos' => '');
        // Every (INTERVAL) FREQ...
        $freq_str = strtolower(array_search($this->freq, self::$frequencies));
        $parts['freq'] = strtr(self::i18nSelect($i18n[$freq_str], $this->interval), array('%{interval}' => $this->interval));
        // BYXXX rules
        if (not_empty($this->rule['BYMONTH'])) {
            $tmp = $this->bymonth;
            foreach ($tmp as &$value) {
                $value = $i18n['months'][$value];
            }
            $parts['bymonth'] = strtr(self::i18nSelect($i18n['bymonth'], count($tmp)), array('%{months}' => self::i18nList($tmp, $i18n['and'])));
        }
        if (not_empty($this->rule['BYWEEKNO'])) {
            // XXX negative week number are not great here
            $tmp = $this->byweekno;
            foreach ($tmp as &$value) {
                $value = strtr($i18n['nth_weekno'], array('%{n}' => $value));
            }
            $parts['byweekno'] = strtr(self::i18nSelect($i18n['byweekno'], count($this->byweekno)), array('%{weeks}' => self::i18nList($tmp, $i18n['and'])));
        }
        if (not_empty($this->rule['BYYEARDAY'])) {
            $tmp = $this->byyearday;
            foreach ($tmp as &$value) {
                $value = strtr(self::i18nSelect($i18n[$value > 0 ? 'nth_yearday' : '-nth_yearday'], $value), array('%{n}' => abs($value)));
            }
            $tmp = strtr(self::i18nSelect($i18n['byyearday'], count($tmp)), array('%{yeardays}' => self::i18nList($tmp, $i18n['and'])));
            // ... of the month
            $tmp = strtr(self::i18nSelect($i18n['x_of_the_y'], 'yearly'), array('%{x}' => $tmp));
            $parts['byyearday'] = $tmp;
        }
        if (not_empty($this->rule['BYMONTHDAY'])) {
            $parts['bymonthday'] = array();
            if ($this->bymonthday) {
                $tmp = $this->bymonthday;
                foreach ($tmp as &$value) {
                    $value = strtr(self::i18nSelect($i18n['nth_monthday'], $value), array('%{n}' => $value));
                }
                $tmp = strtr(self::i18nSelect($i18n['bymonthday'], count($tmp)), array('%{monthdays}' => self::i18nList($tmp, $i18n['and'])));
                // ... of the month
                $tmp = strtr(self::i18nSelect($i18n['x_of_the_y'], 'monthly'), array('%{x}' => $tmp));
                $parts['bymonthday'][] = $tmp;
            }
            if ($this->bymonthday_negative) {
                $tmp = $this->bymonthday_negative;
                foreach ($tmp as &$value) {
                    $value = strtr(self::i18nSelect($i18n['-nth_monthday'], $value), array('%{n}' => -$value));
                }
                $tmp = strtr(self::i18nSelect($i18n['bymonthday'], count($tmp)), array('%{monthdays}' => self::i18nList($tmp, $i18n['and'])));
                // ... of the month
                $tmp = strtr(self::i18nSelect($i18n['x_of_the_y'], 'monthly'), array('%{x}' => $tmp));
                $parts['bymonthday'][] = $tmp;
            }
            $parts['bymonthday'] = implode(' ' . $i18n['and'], $parts['bymonthday']);
        }
        if (not_empty($this->rule['BYDAY'])) {
            $parts['byweekday'] = array();
            if ($this->byweekday) {
                $tmp = $this->byweekday;
                foreach ($tmp as &$value) {
                    $value = $i18n['weekdays'][$value];
                }
                $parts['byweekday'][] = strtr(self::i18nSelect($i18n['byweekday'], count($tmp)), array('%{weekdays}' => self::i18nList($tmp, $i18n['and'])));
            }
            if ($this->byweekday_nth) {
                $tmp = $this->byweekday_nth;
                foreach ($tmp as &$value) {
                    list($day, $n) = $value;
                    $value = strtr(self::i18nSelect($i18n[$n > 0 ? 'nth_weekday' : '-nth_weekday'], $n), array('%{weekday}' => $i18n['weekdays'][$day], '%{n}' => abs($n)));
                }
                $tmp = strtr(self::i18nSelect($i18n['byweekday'], count($tmp)), array('%{weekdays}' => self::i18nList($tmp, $i18n['and'])));
                // ... of the year|month
                $tmp = strtr(self::i18nSelect($i18n['x_of_the_y'], $freq_str), array('%{x}' => $tmp));
                $parts['byweekday'][] = $tmp;
            }
            $parts['byweekday'] = implode(' ' . $i18n['and'], $parts['byweekday']);
        }
        if (not_empty($this->rule['BYHOUR'])) {
            $tmp = $this->byhour;
            foreach ($tmp as &$value) {
                $value = strtr($i18n['nth_hour'], array('%{n}' => $value));
            }
            $parts['byhour'] = strtr(self::i18nSelect($i18n['byhour'], count($tmp)), array('%{hours}' => self::i18nList($tmp, $i18n['and'])));
        }
        if (not_empty($this->rule['BYMINUTE'])) {
            $tmp = $this->byminute;
            foreach ($tmp as &$value) {
                $value = strtr($i18n['nth_minute'], array('%{n}' => $value));
            }
            $parts['byminute'] = strtr(self::i18nSelect($i18n['byminute'], count($tmp)), array('%{minutes}' => self::i18nList($tmp, $i18n['and'])));
        }
        if (not_empty($this->rule['BYSECOND'])) {
            $tmp = $this->bysecond;
            foreach ($tmp as &$value) {
                $value = strtr($i18n['nth_second'], array('%{n}' => $value));
            }
            $parts['bysecond'] = strtr(self::i18nSelect($i18n['bysecond'], count($tmp)), array('%{seconds}' => self::i18nList($tmp, $i18n['and'])));
        }
        if ($this->bysetpos) {
            $tmp = $this->bysetpos;
            foreach ($tmp as &$value) {
                $value = strtr(self::i18nSelect($i18n[$value > 0 ? 'nth_setpos' : '-nth_setpos'], $value), array('%{n}' => abs($value)));
            }
            $tmp = strtr(self::i18nSelect($i18n['bysetpos'], count($tmp)), array('%{setpos}' => self::i18nList($tmp, $i18n['and'])));
            $parts['bysetpos'] = $tmp;
        }
        // from X
        $parts['start'] = strtr($i18n['dtstart'], array('%{date}' => $opt['date_formatter']($this->dtstart)));
        // to X, or N times, or indefinitely
        if (!$this->until && !$this->count) {
            $parts['end'] = $i18n['infinite'];
        } elseif ($this->until) {
            $parts['end'] = strtr($i18n['until'], array('%{date}' => $opt['date_formatter']($this->until)));
        } elseif ($this->count) {
            $parts['end'] = strtr(self::i18nSelect($i18n['count'], $this->count), array('%{count}' => $this->count));
        }
        // $str = strtr('%{frequency}%{byday}%{start}%{end}', array(
        // 	'%{frequency}' => $parts['frequency'],
        // 	'%{start}' => $parts['start'],
        // 	'%{end}' => $parts['end'],
        // 	'%{byday}' => $parts['byday'],
        // ));
        $parts = array_filter($parts);
        $str = implode('', $parts);
        return $str;
    }

 public static function getHumanReadableFromPattern($start, $pattern)
 {
     $untilpos = strpos($pattern, 'UNTIL');
     $startDateTime = new \DateTime($start);
     if ($untilpos !== false) {
         $time = $startDateTime->format('\\This\\Z');
         $newpattern = substr_replace($pattern, $time, $untilpos + 6 + 8, 0);
         $rule = 'DTSTART;TZID=Etc/GMT:' . $startDateTime->format('Ymd\\THis') . '
              RRULE:' . $newpattern;
     } else {
         $rule = 'DTSTART;TZID=Etc/GMT:' . $startDateTime->format('Ymd\\THis') . '
             RRULE:' . $pattern;
     }
     $rrule = new RRule($rule);
     return $rrule->humanReadable(array('locale' => 'fr'));
 }