PHP: Many entrys form one file show on a website

I have a Problem i want to search in an file with content like this:

startstring 01.01.1970 00:00:00endstring
otherstartstring Blabla.par
Blabla2.par
Blabla3.par
Blabla4.par
}
startstring 01.02.1970 00:00:00endstring
otherstartstring Blabla.par
}
startstring 01.03.1970 00:00:00endstring
otherstartstring Blabla.par
Blabla2.par
}
startstring 01.03.1970 00:00:00endstring
otherstartstring Blabla.par
Blabla2.par
Blabla3.par
Blabla4.par
}

and show on a website (and import in a MariaDB Database):

date=01.01.1970 00:00:00
text=Blabla. Blabla2. Blabla3. Blabla4.

For now i have the script for just one “Blabla.”

$date = array();
$text = array();
foreach ($file as $line) {
    if (strpos($line, "startstring ") !== false) {
        $date[] = substr($line, strpos($line, "startstring") + 14, 19);
    }
    if (strpos($line, "otherstartstring") !== false) {
        $text[] = substr($line, strpos($line, "otherstartstring") + 27, -6);
    }
}