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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.xml-set-processing-instruction-handler">
<refnamediv>
<refname>xml_set_processing_instruction_handler</refname>
<refpurpose>
Set up processing instruction (PI) handler
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>xml_set_processing_instruction_handler</methodname>
<methodparam><type>resource</type><parameter>parser</parameter></methodparam>
<methodparam><type>callback</type><parameter>handler</parameter></methodparam>
</methodsynopsis>
<para>
Sets the processing instruction (PI) handler function for the XML parser
<parameter>parser</parameter>.
</para>
<para>
A processing instruction has the following format:
<informalexample>
<programlisting><?<replaceable>target</replaceable>
<replaceable>data</replaceable>?>
</programlisting>
</informalexample>
You can put PHP code into such a tag, but be aware of one limitation: in
an XML PI, the PI end tag (<literal>?></literal>) can not be quoted,
so this character sequence should not appear in the PHP code you embed
with PIs in XML documents.If it does, the rest of the PHP code, as well
as the "real" PI end tag, will be treated as character data.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>parser</parameter></term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>handler</parameter></term>
<listitem>
<para>
<parameter>handler</parameter> is a string containing the name of a
function that must exist when <function>xml_parse</function> is called
for <parameter>parser</parameter>.
</para>
<para>
The function named by <parameter>handler</parameter> must accept
three parameters:
<methodsynopsis>
<methodname><replaceable>handler</replaceable></methodname>
<methodparam><type>resource</type><parameter>parser</parameter></methodparam>
<methodparam><type>string</type><parameter>target</parameter></methodparam>
<methodparam><type>string</type><parameter>data</parameter></methodparam>
</methodsynopsis>
<variablelist>
<varlistentry>
<term><parameter>parser</parameter></term>
<listitem>
<simpara>
The first parameter, <replaceable>parser</replaceable>, is a
reference to the XML parser calling the handler.
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>target</parameter></term>
<listitem>
<simpara>
The second parameter, <parameter>target</parameter>, contains the PI
target.
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>data</parameter></term>
<listitem>
<simpara>
The third parameter, <parameter>data</parameter>, contains the PI
data.
</simpara>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
If a handler function is set to an empty string, or &false;, the handler
in question is disabled.
</para>
¬e.func-callback;
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
</refentry>
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-->
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