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> The following list gives an overview of which rights the PHP project
reserves for itself, when choosing names for new internal identifiers.
The definitive guide is the official
<A
HREF="http://cvs.php.net/viewvc.cgi/php-src/CODING_STANDARDS?view=co"
TARGET="_top"
>CODING STANDARDS</A
>:
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><P
> PHP owns the top-level namespace but tries to find decent descriptive
names and avoid any obvious clashes.
</P
></LI
><LI
><P
> Function names use underscores between words, while class names use
the camel case rule (there are some exceptions for older
classes and functions).
</P
></LI
><LI
><P
> PHP will prefix any global symbols of an extension with the name of
the extension. (In the past, there have been numerous
exceptions to this rule.) Examples:
</P
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><UL
><LI
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><A
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><B
CLASS="function"
>curl_close()</B
></A
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></LI
><LI
><P
><A
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><B
CLASS="function"
>mysql_query()</B
></A
></P
></LI
><LI
><P
>PREG_SPLIT_DELIM_CAPTURE</P
></LI
><LI
><P
>new DOMDocument()</P
></LI
><LI
><P
> <A
HREF="function.strpos.html"
><B
CLASS="function"
>strpos()</B
></A
> (example of a past mistake)
</P
></LI
><LI
><P
>new SplFileObject()</P
></LI
></UL
></LI
><LI
><P
> Iterators and Exceptions are however simply postfixed with
"<TT
CLASS="literal"
>Iterator</TT
>" and "<TT
CLASS="literal"
>Exception</TT
>."
Examples:
</P
><P
></P
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><P
><TT
CLASS="literal"
>ArrayIterator</TT
></P
></LI
><LI
><P
><TT
CLASS="literal"
>LogicException</TT
></P
></LI
></UL
></LI
><LI
><P
> PHP reserves all symbols starting with <TT
CLASS="literal"
>__</TT
>
as magical. It is recommended that you do not create symbols starting
with <TT
CLASS="literal"
>__</TT
> in PHP unless
you want to use documented magical functionality. Examples:
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><B
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>__get()</B
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><B
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>__autoload()</B
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