cvs: phpdoc /en/reference/misc/functions defined.xml

philip Tue Jun 10 00:48:56 2003 EDT Modified files: /phpdoc/en/reference/misc/functions defined.xml Log: Implement user notes: use isset for variables, see also function_exists, and make it clear the importance of passing in a string. Also some minor fixes. Index: phpdoc/en/reference/misc/functions/defined.xml diff -u phpdoc/en/reference/misc/functions/defined.xml:1.3 phpdoc/en/reference/misc/functions/defined.xml:1.4 --- phpdoc/en/reference/misc/functions/defined.xml:1.3 Sun Mar 30 21:05:12 2003 +++ phpdoc/en/reference/misc/functions/defined.xml Tue Jun 10 00:48:56 2003 @@ -1,5 +1,5 @@ <?xml version="1.0" encoding="iso-8859-1"?> -<!-- $Revision: 1.3 $ --> +<!-- $Revision: 1.4 $ --> <!-- splitted from ./en/functions/misc.xml, last change in rev 1.2 --> <refentry id="function.defined"> <refnamediv> @@ -18,23 +18,35 @@ Returns &true; if the named constant given by <parameter>name</parameter> has been defined, &false; otherwise. - <example> + </para> + <para> + <example> <title>Checking Constants</title> <programlisting role="php"> <![CDATA[ <?php -if (defined("CONSTANT")){ // Note that it should be quoted +// Note the use of quotes, this is important. This example is checking +// if the string 'CONSTANT' is the name of a constant named CONSTANT +if (defined('CONSTANT')) { echo CONSTANT; - } +} ?> ]]> </programlisting> </example> </para> + <note> + <para> + If you're wanting to see if a variable exists, use + <function>isset</function> as <function>defined</function> only + applies to <link linkend="language.constants">constants</link>. + </para> + </note> <para> See also <function>define</function>, <function>constant</function>, - <function>get_defined_constants</function> and the section on + <function>get_defined_constants</function>, + <function>function_exists</function>, and the section on <link linkend="language.constants">Constants</link>. </para> </refsect1>