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PHP 5 Kochbuch, Third Edition
book

PHP 5 Kochbuch, Third Edition

by David Sklar, Adam Trachtenberg, Carsten Lucke, Matthias Brusdeylins, Ulrich Speidel, Stephan Schmidt
September 2009
Intermediate to advanced
912 pages
48h 11m
German
O'Reilly Verlag
Content preview from PHP 5 Kochbuch, Third Edition

18.9 Grafiken geschützt ausgeben

Problem

Sie wollen bestimmen können, wer bestimmte Bilder ansehen kann und wer nicht.

Lösung

Bewahren Sie Ihre Bilder nicht in Ihrem Dokumentenpfad auf, sondern speichern Sie sie an einer anderen Stelle ab. Um eine Datei auszugeben, öffnen Sie sie von Hand und senden sie an den Browser:

header('Content-Type: image/png');
readfile('/pfad/zum/bild.png');

Diskussion

Die erste Zeile der Lösung sendet den Content-type-Header zum Browser, damit der Browser weiß, welche Objektart auf ihn zukommt, und diese entsprechend anzeigen kann. Die zweite Zeile öffnet eine Datei auf einer Festplatte (oder von einer ausgelagerten URL) für Lesezwecke, liest sie ein, gibt sie direkt an den Browser weiter und schließt die Datei.

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Publisher Resources

ISBN: 9783868993271Purchase book