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- PHP 3 development appendix moved to this part - Streams API docs moved to this part - ZendAPI docs with figures integrated in this part More info: http://news.php.net/php.doc/969369673 git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@194089 c90b9560-bf6c-de11-be94-00142212c4b1
99 lines
3.7 KiB
XML
99 lines
3.7 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1" ?>
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<!-- $Revision: 1.1 $ -->
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<sect1 id="zend.overview">
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<title>Overview</title>
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<para>
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"Extending PHP" is easier said than done. PHP has evolved to a
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full-fledged tool consisting of a few megabytes of source code,
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and to hack a system like this quite a few things have to be
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learned and considered. When structuring this chapter, we finally
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decided on the "learn by doing" approach. This is not the most
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scientific and professional approach, but the method that's the
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most fun and gives the best end results. In the following
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sections, you'll learn quickly how to get the most basic
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extensions to work almost instantly. After that, you'll learn
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about Zend's advanced API functionality. The alternative would
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have been to try to impart the functionality, design, tips,
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tricks, etc. as a whole, all at once, thus giving a complete look
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at the big picture before doing anything practical. Although this
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is the "better" method, as no dirty hacks have to be made, it can
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be very frustrating as well as energy- and time-consuming, which
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is why we've decided on the direct approach.
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</para>
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<para>
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Note that even though this chapter tries to impart as much
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knowledge as possible about the inner workings of PHP, it's
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impossible to really give a complete guide to extending PHP that
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works 100% of the time in all cases. PHP is such a huge and
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complex package that its inner workings can only be understood if
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you make yourself familiar with it by practicing, so we encourage
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you to work with the source.
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</para>
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<sect2 id="zend.overview.whatisit">
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<title>What Is Zend? and What Is PHP?</title>
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<para>
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The name <emphasis>Zend</emphasis> refers to the language engine,
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PHP's core. The term <emphasis>PHP</emphasis> refers to the
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complete system as it appears from the outside. This might sound
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a bit confusing at first, but it's not that complicated (see
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<xref linkend='fig.internal-struct'/>). To implement a Web script interpreter, you need
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three parts:
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<orderedlist>
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<listitem>
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<para>
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The <emphasis>interpreter</emphasis> part analyzes the input
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code, translates it, and executes it.
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</para>
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</listitem>
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<listitem>
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<para>
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The <emphasis>functionality</emphasis> part implements the
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functionality of the language (its functions, etc.).
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</para>
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</listitem>
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<listitem>
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<para>
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The <emphasis>interface</emphasis> part talks to the Web
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server, etc.
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</para>
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</listitem>
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</orderedlist>
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Zend takes part 1 completely and a bit of part 2; PHP takes parts
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2 and 3. Together they form the complete PHP package. Zend itself
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really forms only the language core, implementing PHP at its very
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basics with some predefined functions. PHP contains all the
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modules that actually create the language's outstanding
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capabilities.
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<figure id='fig.internal-struct'>
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<title>The internal structure of PHP.</title>
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<graphic fileref="figures/zend.01-internal-structure.png"/>
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</figure>
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</para>
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<para>
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The following sections discuss where PHP can be extended and how
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it's done.
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</para>
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</sect2>
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</sect1>
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