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added an example about valid and invalid constant names
# but every name is valid in fact.. git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@159220 c90b9560-bf6c-de11-be94-00142212c4b1
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<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.35 $ -->
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<!-- $Revision: 1.36 $ -->
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<chapter id="language.constants">
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<title>Constants</title>
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@ -17,8 +17,31 @@
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by any number of letters, numbers, or underscores. As a regular
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expression, it would be expressed thusly:
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<literal>[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*</literal>
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</para>
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<para>
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<example>
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<title>Valid and invalid constant names</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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<!-- TODO: Example of valid & invalid constant names -->
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// Valid constant names
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define("foo", "something");
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define("foo2", "something else");
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define("foo_bar", "something more")
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// Invalid constant names
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define("2foo", "something");
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// This is valid, but should be avoided:
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// PHP may one day provide a magical constant
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// that will break your script
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define("__foo__", "something");
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<note>
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<simpara>
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