June 2005
Intermediate to advanced
794 pages
18h 27m
German
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7.13 Polymorphe Methoden verwenden
Problem
Sie möchten in Abhängigkeit von der Anzahl und dem Typ der an eine Methode übergebenen Argumente unterschiedlichen Code ausführen.
Lösung
PHP unterstützt keine Methoden-Polymorphie als eingebaute Möglichkeit. Allerdings können Sie diese mit Hilfe verschiedener Funktionen zur Typüberprüfung emulieren. Die folgende Funktion combine( ) setzt is_numeric(), is_string(), is_array() und is_bool() ein:
// combine() kann Zahlen addieren, Strings verketten, // Arrays verschmelzen sowie bitorientierte und Boolesche Argumente // mit UND verknüpfen. function combine($a, $b) { if (is_numeric($a) && is_numeric($b)) { return $a + $b; } if (is_string($a) && is_string($b)) { return "$a$b"; } if (is_array($a) && is_array($b)) ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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.
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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.