Bisherigen Sucheinträge:
language functions ,
include functions ,
variable functions ,
post functions
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One of the key-point of PHP5 OOP that is often mentioned is that "objects are passed by references by default" This is not completely true. This section rectifies that general thought using some examples.
Eine PHP-Referenz ist ein Alias, der es ermöglicht, dass zwei unterschiedliche Variablen sich auf denselben Wert beziehen. Beginnend mit PHP 5 enthält eine Objektvariable nicht mehr das Objekt als Wert, sondern nur einen Objektbezeichner, der bei Objektzugriffen die Identifizierung des eigentlichen Objektes ermöglicht. Wenn ein Objekt als Argument oder Rückgabewert übergeben oder einer anderen Variable zugewiesen wird, so sind die verschiedenen Variablen keine Aliase, sie enthalten vielmehr Kopien des Bezeichners, die auf dasselbe Objekt verweisen.
Beispiel #1 Referenzen und Objekte
<?php
class A {
public $foo = 1;
}
$a = new A;
$b = $a; // $a und $b sind Kopien des gleichen Bezeichners
// ($a) = ($b) = <id>
$b->foo = 2;
echo $a->foo."\n";
$c = new A;
$d = &$c; // $c und $d sind Referenzen
// ($c,$d) = <id>
$d->foo = 2;
echo $c->foo."\n";
$e = new A;
function foo($obj) {
// ($obj) = ($e) = <id>
$obj->foo = 2;
}
foo($e);
echo $e->foo."\n";
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
2 2 2
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