reference/classobj/functions/class-exists.xml
42bd1bfed391b287e55e47fed1b8f8d22a033ee0
42bd1bfed391b287e55e47fed1b8f8d22a033ee0
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&reftitle.description;
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<methodsynopsis>
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<type>bool</type><methodname>class_exists</methodname>
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<methodparam><type>string</type><parameter>class_name</parameter></methodparam>
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<methodparam><type>string</type><parameter>class</parameter></methodparam>
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<methodparam choice="opt"><type>bool</type><parameter>autoload</parameter><initializer>&true;</initializer></methodparam>
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</methodsynopsis>
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<para>
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>class_name</parameter></term>
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<term><parameter>class</parameter></term>
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<listitem>
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<para>
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The class name. The name is matched in a case-insensitive manner.
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<term><parameter>autoload</parameter></term>
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<listitem>
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<para>
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Whether or not to call &link.autoload; by default.
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Whether to <link linkend="language.oop5.autoload">autoload</link>
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if not already loaded.
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</para>
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</listitem>
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</varlistentry>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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Returns &true; if <parameter>class_name</parameter> is a defined class,
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Returns &true; if <parameter>class</parameter> is a defined class,
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&false; otherwise.
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</para>
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</refsect1>
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@@ -68,17 +69,16 @@ if (class_exists('MyClass')) {
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<programlisting role="php">
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<![CDATA[
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<?php
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function __autoload($class)
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{
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include($class . '.php');
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spl_autoload_register(function ($class_name) {
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include $class_name . '.php';
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// Check to see whether the include declared the class
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if (!class_exists($class, false)) {
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trigger_error("Unable to load class: $class", E_USER_WARNING);
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if (!class_exists($class_name, false)) {
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throw new LogicException("Unable to load class: $class_name");
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}
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}
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});
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if (class_exists('MyClass')) {
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if (class_exists(MyClass::class)) {
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$myclass = new MyClass();
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}
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@@ -93,13 +93,13 @@ if (class_exists('MyClass')) {
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<para>
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<simplelist>
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<member><function>function_exists</function></member>
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<member><function>enum_exists</function></member>
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<member><function>interface_exists</function></member>
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<member><function>get_declared_classes</function></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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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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