June 2005
Intermediate to advanced
794 pages
18h 27m
German
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21.19 Metazeichen der Shell mit Escape-Zeichen versehen
Problem
Sie müssen externe Daten in eine Kommandozeile einfügen, aber Sie wollen Sonderzeichen durch Escapezeichen entschärfen, so dass nichts Unvorhergesehenes passieren kann. Beispiel: Sie wollen Benutzereingaben als Kommandozeilen-Parameter an ein Programm übergeben.
Lösung
Verwenden Sie dagegen escapeshellarg( ), wenn es sich um Kommandozeilenparameter handelt:
system('ls -al '.escapeshellarg($directory));Verwenden Sie escapeshellcmd( ), wenn es sich um Programmnamen handelt:
system(escapeshellcmd($ls_program).' -al');
Diskussion
Die Kommandozeile ist ein gefährlicher Platz für ungefilterte Zeichen. Geben Sie nie unmodifizierte Benutzereingaben an eine Funktion von PHP durch, die ihre Parameter ...
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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.