Sophie: php-manual-ro-0:20051028-1 noarch

php-manual-ro-20051028-1.noarch.rpm

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>defined</H1
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>    (PHP 3, PHP 4 , PHP 5)</P
>defined&nbsp;--&nbsp;
     Checks whether a given named constant exists
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><H2
>Description</H2
>bool <B
CLASS="methodname"
>defined</B
> ( string name)<BR
></BR
><P
>&#13;     Returns <TT
CLASS="constant"
><B
>TRUE</B
></TT
> if the named constant given by
     <VAR
CLASS="parameter"
>name</VAR
> has been defined, 
     <TT
CLASS="constant"
><B
>FALSE</B
></TT
> otherwise.
    </P
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>&#13;     <TABLE
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><B
>Exemplu 1. Checking Constants</B
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#FF8000">/* Note the use of quotes, this is important.&nbsp;&nbsp;This example is checking <br /> * if the string 'CONSTANT' is the name of a constant named CONSTANT */<br /></font><font color="#007700">if (</font><font color="#0000BB">defined</font><font color="#007700">(</font><font color="#DD0000">'CONSTANT'</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#0000BB">CONSTANT</font><font color="#007700">;<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
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>
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><B
>Not&#227;: </B
>
      If you want to see if a variable exists, use 
      <A
HREF="function.isset.html"
><B
CLASS="function"
>isset()</B
></A
> as <B
CLASS="function"
>defined()</B
> only
      applies to <A
HREF="language.constants.html"
>constants</A
>.
      If you want to see if a function exists, use 
      <A
HREF="function.function-exists.html"
><B
CLASS="function"
>function_exists()</B
></A
>.
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     See also <A
HREF="function.define.html"
><B
CLASS="function"
>define()</B
></A
>,
     <A
HREF="function.constant.html"
><B
CLASS="function"
>constant()</B
></A
>,
     <A
HREF="function.get-defined-constants.html"
><B
CLASS="function"
>get_defined_constants()</B
></A
>, 
     <A
HREF="function.function-exists.html"
><B
CLASS="function"
>function_exists()</B
></A
>, and the section on
     <A
HREF="language.constants.html"
>Constants</A
>.
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