language/oop5/object-comparison.xml
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a9edd62d087ab1eb6292c795b7256e14ff9f1234
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<sect1 xml:id="language.oop5.object-comparison" xmlns="http://docbook.org/ns/docbook">
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<title>Comparing Objects</title>
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<para>
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In PHP 5, object comparison is more complicated than in PHP 4 and more
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in accordance to what one will expect from an Object Oriented Language
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(not that PHP 5 is such a language).
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</para>
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<para>
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When using the comparison operator (<literal>==</literal>),
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object variables are compared in a simple manner, namely: Two object
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instances are equal if they have the same attributes and values, and are
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instances are equal if they have the same attributes and values (values are compared with <literal>==</literal>), and are
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instances of the same class.
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</para>
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<para>
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On the other hand, when using the identity operator (<literal>===</literal>),
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When using the identity operator (<literal>===</literal>),
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object variables are identical if and only if they refer to the same
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instance of the same class.
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</para>
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<para>
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An example will clarify these rules.
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<example>
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<title>Example of object comparison in PHP 5</title>
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<title>Example of object comparison</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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@@ -46,7 +41,7 @@ class Flag
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{
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public $flag;
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function Flag($flag = true) {
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function __construct($flag = true) {
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$this->flag = $flag;
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}
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}
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@@ -55,7 +50,7 @@ class OtherFlag
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{
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public $flag;
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function OtherFlag($flag = true) {
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function __construct($flag = true) {
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$this->flag = $flag;
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}
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}
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</para>
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<note>
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<para>
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Extensions can define own rules for their objects comparison.
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Extensions can define own rules for their objects comparison
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(<literal>==</literal>).
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</para>
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</note>
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</sect1>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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