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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

6.7 Mehr als einen Wert zurückgeben

Problem

Sie möchten aus einer Funktion mehr als nur einen Wert zurückgeben.

Lösung

Geben Sie ein Array zurück und trennen Sie dessen Elemente mit list():

function averages($stats) {
    // ...
    return array($median, $mean, $mode);
}

list($median, $mean, $mode) = averages($stats);

Diskussion

Aus Performance-Sicht ist dies keine besonders gute Idee. Es führt zu einer zusätzlichen Belastung, wenn PHP gezwungen wird, ein Array anzulegen und gleich wieder wegzuwerfen. Und dies geschieht in dem folgenden Beispiel:

function time_parts($time) {
    return explode(':', $time);
}

list($hour, $minute, $second) = time_parts('12:34:56');

Sie übergeben einen Zeit-String, wie man ihn auf einer Digitaluhr sehen kann, und rufen explode() auf, ...

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Publisher Resources

ISBN: 9783868993271Purchase book