reference/funchand/functions/function-exists.xml
c44475e1fafcbee203ed4935a6d5d7a01379fcdc
c44475e1fafcbee203ed4935a6d5d7a01379fcdc
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&reftitle.description;
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<methodsynopsis>
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<type>bool</type><methodname>function_exists</methodname>
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<methodparam><type>string</type><parameter>function_name</parameter></methodparam>
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<methodparam><type>string</type><parameter>function</parameter></methodparam>
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</methodsynopsis>
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<para>
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Checks the list of defined functions, both built-in (internal) and
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user-defined, for <parameter>function_name</parameter>.
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user-defined, for <parameter>function</parameter>.
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</para>
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</refsect1>
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>function_name</parameter></term>
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<term><parameter>function</parameter></term>
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<listitem>
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<para>
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The function name, as a string.
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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>function_name</parameter> exists and is a
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Returns &true; if <parameter>function</parameter> exists and is a
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function, &false; otherwise.
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</para>
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<note>
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<note>
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<para>
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A function name may exist even if the function itself is unusable due to
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configuration or compiling options (with the <link
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linkend="ref.image">image</link> functions being an example).
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configuration or compiling options (with the <link linkend="ref.image">image</link> functions being an example).
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</para>
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</note>
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</refsect1>
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@@ -86,12 +85,13 @@ if (function_exists('imap_open')) {
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<member><function>method_exists</function></member>
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<member><function>is_callable</function></member>
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<member><function>get_defined_functions</function></member>
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<member><function>class_exists</function></member>
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<member><function>extension_loaded</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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