mirror of
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111 lines
2.6 KiB
XML
111 lines
2.6 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision$ -->
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<sect1 id="language.modifier.default">
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<title>default</title>
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<para>
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This is used to set a default value for a variable. If the variable
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is unset or an empty string, the given default value is printed instead.
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Default takes the one argument.
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</para>
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<para>
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<note>
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<para>
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With <ulink url="&url.php-manual;error_reporting">
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<varname>error_reporting(E_ALL)</varname></ulink>,
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undeclared variables will always throw an error within the template.
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This function is useful for replacing null or zero length strings.
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</para>
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</note>
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</para>
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<informaltable frame="all">
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<tgroup cols="5">
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<colspec colname="param" align="center" />
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<colspec colname="type" align="center" />
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<colspec colname="required" align="center" />
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<colspec colname="default" align="center" />
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<colspec colname="desc" />
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<thead>
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<row>
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<entry>Parameter Position</entry>
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<entry>Type</entry>
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<entry>Required</entry>
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<entry>Default</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>1</entry>
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<entry>string</entry>
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<entry>No</entry>
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<entry><emphasis>empty</emphasis></entry>
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<entry>This is the default value to output if the
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variable is empty.</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<example>
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<title>default</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$smarty->assign('articleTitle', 'Dealers Will Hear Car Talk at Noon.');
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$smarty->assign('email', '');
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?>
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]]>
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</programlisting>
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<para>
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Where template is:
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</para>
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<programlisting>
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<![CDATA[
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{$articleTitle|default:'no title'}
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{$myTitle|default:'no title'}
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{$email|default:'No email address available'}
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]]>
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</programlisting>
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<para>
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Will output:
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</para>
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<screen>
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<![CDATA[
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Dealers Will Hear Car Talk at Noon.
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no title
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No email address available
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]]>
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</screen>
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</example>
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<para>
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See also the
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<link linkend="tips.default.var.handling">default variable handling</link>
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and the
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<link linkend="tips.blank.var.handling">blank variable handling</link> pages.
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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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