September 2009
Intermediate to advanced
912 pages
48h 11m
German
book
PHP 5 Kochbuch, Third Edition
by David Sklar, Adam Trachtenberg, Carsten Lucke, Matthias Brusdeylins, Ulrich Speidel, Stephan Schmidt
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10.15 Umgebungsvariablen lesen
Problem
Sie benötigen den Inhalt einer Umgebungsvariablen.
Lösung
Lesen Sie den Wert aus dem superglobalen Array $_ENV:
$name = $_ENV['USER'];
Diskussion
Umgebungsvariablen sind benannte, einem Prozess zugeordnete Werte. Unter Unix können Sie zum Beispiel den Inhalt von $_ENV['HOME'] überprüfen, um das Home-Verzeichnis eines Benutzers herauszubekommen:
print $_ENV['HOME']; // Home-Verzeichnis des Benutzers
/home/adamFrühere PHP-Versionen erzeugten standardmäßig PHP-Variablen automatisch für alle Umgebungsvariablen. Seit 4.1.0 schaltet php.ini-recommended dies aus Geschwindigkeitsgründen ab; php.ini-dist erlaubt aber weiterhin das Lesen der Umgebungsvariablen, um abwärtskompatibel zu bleiben.
Das Array $_ENV wird nur angelegt, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.