Comparing return value of include (bug #15438)

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@164487 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Jakub Vrana 2004-07-27 19:53:55 +00:00
parent 90e7198702
commit 64c2c97264

View file

@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.97 $ -->
<!-- $Revision: 1.98 $ -->
<chapter id="language.control-structures">
<title>Control Structures</title>
@ -1424,6 +1424,29 @@ if ($condition) {
variables within those tags and they will be introduced at whichever point
the file was included.
</simpara>
<para>
Because <function>include</function> is a special language costruct,
parentheses are not needed around its argument. Take care when comparing
return value.
<example>
<title>Comparing return value of include</title>
<programlisting role="php">
<![CDATA[
<?php
// won't work, evaluated as include(('vars.php') == 'OK'), i.e. include('')
if (include('vars.php') == 'OK') {
echo 'OK';
}
// works
if ((include 'vars.php') == 'OK') {
echo 'OK';
}
?>
]]>
</programlisting>
</example>
</para>
<para>
<note>
<simpara>