mirror of
https://github.com/sigmasternchen/php-doc-en
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70 lines
2.5 KiB
XML
70 lines
2.5 KiB
XML
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<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision: 1.2 $ -->
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<article xml:id="xml.encoding" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<title>Character Encoding</title>
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<para>
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PHP's XML extension supports the <link
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xlink:href="&url.unicode;">Unicode</link> character set through
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different <glossterm>character encoding</glossterm>s. There are
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two types of character encodings, <glossterm>source
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encoding</glossterm> and <glossterm>target encoding</glossterm>.
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PHP's internal representation of the document is always encoded
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with <literal>UTF-8</literal>.
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</para>
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<para>
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Source encoding is done when an XML document is <link
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linkend="function.xml-parse">parsed</link>. Upon <link
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linkend="function.xml-parser-create">creating an XML
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parser</link>, a source encoding can be specified (this encoding
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can not be changed later in the XML parser's lifetime). The
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supported source encodings are <literal>ISO-8859-1</literal>,
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<literal>US-ASCII</literal> and <literal>UTF-8</literal>. The
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former two are single-byte encodings, which means that each
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character is represented by a single byte.
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<literal>UTF-8</literal> can encode characters composed by a
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variable number of bits (up to 21) in one to four bytes. The
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default source encoding used by PHP is
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<literal>ISO-8859-1</literal>.
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</para>
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<para>
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Target encoding is done when PHP passes data to XML handler
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functions. When an XML parser is created, the target encoding
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is set to the same as the source encoding, but this may be
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changed at any point. The target encoding will affect character
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data as well as tag names and processing instruction targets.
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</para>
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<para>
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If the XML parser encounters characters outside the range that
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its source encoding is capable of representing, it will return
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an error.
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</para>
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<para>
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If PHP encounters characters in the parsed XML document that can
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not be represented in the chosen target encoding, the problem
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characters will be "demoted". Currently, this means that such
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characters are replaced by a question mark.
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</para>
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</article>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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