IsValidDateStampString example

$parsedFrame['encoding']   = $this->TextEncodingNameLookup($frame_textencoding);

            $frame_terminatorpos = strpos($parsedFrame['data'], "\x00", $frame_offset);
            $frame_pricepaid = substr($parsedFrame['data'], $frame_offset, $frame_terminatorpos - $frame_offset);
            $frame_offset = $frame_terminatorpos + strlen("\x00");

            $parsedFrame['pricepaid']['currencyid'] = substr($frame_pricepaid, 0, 3);
            $parsedFrame['pricepaid']['currency']   = $this->LookupCurrencyUnits($parsedFrame['pricepaid']['currencyid']);
            $parsedFrame['pricepaid']['value']      = substr($frame_pricepaid, 3);

            $parsedFrame['purchasedate'] = substr($parsedFrame['data'], $frame_offset, 8);
            if ($this->IsValidDateStampString($parsedFrame['purchasedate'])) {
                $parsedFrame['purchasedateunix'] = mktime (0, 0, 0, substr($parsedFrame['purchasedate'], 4, 2), substr($parsedFrame['purchasedate'], 6, 2), substr($parsedFrame['purchasedate'], 0, 4));
            }
            $frame_offset += 8;

            $parsedFrame['seller'] = (string) substr($parsedFrame['data'], $frame_offset);
            $parsedFrame['seller'] = $this->RemoveStringTerminator($parsedFrame['seller'], $this->TextEncodingTerminatorLookup($frame_textencoding));
            unset($parsedFrame['data']);


        } elseif (($id3v2_majorversion >= 3) && ($parsedFrame['frame_name'] == 'COMR')) { // 4.24 COMR Commercial frame (ID3v2.3+ only)             // There may be more than one 'commercial frame' in a tag,