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130 lines
4.7 KiB
XML
130 lines
4.7 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision$ -->
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<sect1 id="plugins.block.functions"><title>Block Functions</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>smarty_block_<replaceable>name</replaceable></function></funcdef>
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<paramdef>array <parameter>$params</parameter></paramdef>
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<paramdef>mixed <parameter>$content</parameter></paramdef>
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<paramdef>object <parameter>&$smarty</parameter></paramdef>
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<paramdef>boolean <parameter>&$repeat</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<para>
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Block functions are functions of the form:
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<literal>{func} .. {/func}</literal>. In other words, they enclose a
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template block and operate on the contents of
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this block. Block functions take precedence over
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<link linkend="language.custom.functions">custom functions</link> of
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the same name, that is, you cannot have both custom function
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<literal>{func}</literal> and block function
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<literal>{func}..{/func}</literal>.
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</para>
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<itemizedlist>
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<listitem><para>
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By default your function implementation is called twice by
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Smarty: once for the opening tag, and once for the closing tag.
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(See <literal>$repeat</literal> below on how to change this.)
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</para></listitem>
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<listitem><para>
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Only the opening tag of the block function may have
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<link linkend="language.syntax.attributes">attributes</link>. All
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attributes passed to template functions from the template are contained
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in the <parameter>$params</parameter> variable as an associative array.
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The opening tag attributes are also accessible to your function
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when processing the closing tag.
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</para></listitem>
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<listitem><para>
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The value of the <parameter>$content</parameter> variable depends on
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whether your function is called for the opening or closing tag. In case
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of the opening tag, it will be &null;, and in case of
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the closing tag it will be the contents of the template block.
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Note that the template block will have already been processed by
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Smarty, so all you will receive is the template output, not the
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template source.
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</para></listitem>
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<listitem><para>
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The parameter <parameter>$repeat</parameter> is passed by
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reference to the function implementation and provides a
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possibility for it to control how many times the block is
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displayed. By default <parameter>$repeat</parameter> is
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&true; at the first call of the block-function (the opening tag)
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and &false; on all subsequent calls to the block function
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(the block's closing tag).
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Each time the function implementation returns with
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<parameter>$repeat</parameter> being &true;, the contents between
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<literal>{func}...{/func}</literal> are evaluated and the function
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implementation is called again with the new block contents in the parameter
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<parameter>$content</parameter>.
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</para></listitem>
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</itemizedlist>
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<para>
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If you have nested block functions, it's possible to find out what the
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parent block function is by accessing
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<literal>$smarty->_tag_stack</literal> variable. Just do a
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<ulink url="&url.php-manual;var_dump"><varname>var_dump()</varname></ulink>
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on it and the structure should be apparent.
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</para>
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<example>
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<title>block function</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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/*
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* Smarty plugin
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* -------------------------------------------------------------
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* File: block.translate.php
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* Type: block
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* Name: translate
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* Purpose: translate a block of text
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* -------------------------------------------------------------
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*/
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function smarty_block_translate($params, $content, &$smarty, &$repeat)
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{
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// only output on the closing tag
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if(!$repeat){
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if (isset($content)) {
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$lang = $params['lang'];
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// do some intelligent translation thing here with $content
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return $translation;
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}
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}
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}
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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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See also:
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<link linkend="api.register.block"><varname>register_block()</varname></link>,
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<link linkend="api.unregister.block"><varname>unregister_block()</varname></link>.
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</para>
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</sect1>
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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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