Programmierung - PHPFormulare absichern

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Wer Kommentare oder Foreneinträge auf seiner Homepage zulässt, öffnet damit zwangsweise eine Sicherheitslücke. Über den geschickten Einsatz von HTML-Codes können Angreifer Ihren Server für eigene Zwecke nutzen. Der Weg für die Angreifer führt über HTML-Tags, etwa ein , das dann Inhalte von ganz anderen Servern einbindet und Daten abfängt. Damit das gar nicht erst passiert, hat PHP zwei gute Gegenmittel. Das eine heißt htmlspecial chars(), das andere strip_tags(). htmlspecialchars() wandelt alle in einem String enthaltenen HTMLCodes in Entitäten um, aus einem < wird zum Beispiel ein <.Damit verliert eingeschleuster HTMLCode seine Wirksamkeit. Gibt jemand HTML ein, erscheint dieser als normaler Text mit allen spitzen Klammern. Schön sieht das freilich nicht aus. Möchten Sie lieber gar keine HTML-Codes sehen, werfen Sie diese einfach hinaus.Dafür zuständig ist die Funktion strip_tags(). Die entfernt komplett alle HTMLCodes, welche ein Besucher eingibt. Der Code zum Unterdrücken aller HTML-Codes sieht folgendermaßen aus: $strBr=”ich bin <b>fett</b>“;<br />echo htmlspecialchars($strBr).”<br />\n”; echo strip_tags($strBr).”\n”;</p> <p>Das Resultat sieht als HTML-Quelltext so aus:</p> <p>ich bin <b$gt;.<br />ich bin fett</p> <p>In der oberen Zeile sind die HTML-Zeichen umgewandelt, in der unteren entfallen sie.Das<br />wird jeweils nach dem Bearbeiten des Strings angehängt.</p> </div> <div class="visibility-end-of-article"></div> <div class="title-similarposts">Lesen Sie auch : </div> <div class="similarposts"> <a href="https://www.itespresso.de/2017/02/13/blackberry-oeffnet-messenger-fuer-enterprise-apps/"> <div class="similar-post"> <div class="similar-post-details"> <h2 class="title-post">Blackberry öffnet Messenger für Enterprise-Apps</h2> </div> </div> </a> <a href="https://www.itespresso.de/2017/01/25/instant-apps-google-startet-betaphase/"> <div class="similar-post"> <div class="similar-post-details"> <h2 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