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Use defined() for constants. See also @ and defined().

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@104416 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Philip Olson 2002-11-16 10:50:29 +00:00
parent 918600ab1d
commit 308eaf0256
1 changed files with 8 additions and 4 deletions
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12
reference/var/functions/isset.xml
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@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.6 $ -->
<!-- $Revision: 1.7 $ -->
<!-- splitted from ./en/functions/var.xml, last change in rev 1.2 -->
<refentry id="function.isset">
<refnamediv>
@ -33,7 +33,9 @@
<title>Warning</title>
<para>
<function>isset</function> only works with variables as passing anything
else will result in a parse error.
else will result in a parse error. For checking if
<link linkend="language.constants">constants</link> are set use the
<function>defined</function> function.
</para>
</note>
<para>
@ -95,8 +97,10 @@ var_dump( array_key_exists('hello', $a) ); // TRUE
</para>
<simpara>
See also <function>empty</function>,
<function>unset</function>, and
<function>array_key_exists</function>.
<function>unset</function>, <function>defined</function>,
<function>array_key_exists</function> and the error control
<link linkend="language.operators.errorcontrol">@</link>
operator.
</simpara>
</refsect1>
</refentry>