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>Output Filters</H1
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> When the template is invoked via
<A
HREF="api.display.html"
><TT
CLASS="varname"
>display()</TT
></A
> or
<A
HREF="api.fetch.html"
><TT
CLASS="varname"
>fetch()</TT
></A
>, its output can
be sent through one or more output filters. This differs from
<A
HREF="advanced.features.postfilters.html"
> <TT
CLASS="varname"
>postfilters</TT
></A
>
because postfilters operate on compiled templates before they are saved to
the disk, whereas output filters operate on the template output when it is
executed.
</P
><P
> Output filters can be either
<A
HREF="api.register.outputfilter.html"
>registered</A
> or loaded
from the
<A
HREF="variable.plugins.dir.html"
>plugins directory</A
> by using the
<A
HREF="api.load.filter.html"
><TT
CLASS="varname"
>load_filter()</TT
></A
>
method or by setting the <A
HREF="variable.autoload.filters.html"
> <TT
CLASS="parameter"
><I
>$autoload_filters</I
></TT
></A
> variable.
Smarty will pass the template output as the first argument,
and expect the function to return the result of the processing.
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>Example 15-4. Using a template outputfilter</B
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><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// put this in your application<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">protect_email</span><span style="color: #007700">(</span><span style="color: #0000BB">$tpl_output</span><span style="color: #007700">, &</span><span style="color: #0000BB">$smarty</span><span style="color: #007700">)<br />{<br /> </span><span style="color: #0000BB">$tpl_output </span><span style="color: #007700">=<br /> </span><span style="color: #0000BB">preg_replace</span><span style="color: #007700">(</span><span style="color: #DD0000">'!(\S+)@([a-zA-Z0-9\.\-]+\.([a-zA-Z]{2,3}|[0-9]{1,3}))!'</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'$1%40$2'</span><span style="color: #007700">, </span><span style="color: #0000BB">$tpl_output</span><span style="color: #007700">);<br /> return </span><span style="color: #0000BB">$tpl_output</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">// register the outputfilter<br /></span><span style="color: #0000BB">$smarty</span><span style="color: #007700">-></span><span style="color: #0000BB">register_outputfilter</span><span style="color: #007700">(</span><span style="color: #DD0000">'protect_email'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$smarty</span><span style="color: #007700">-></span><span style="color: #0000BB">display</span><span style="color: #007700">(</span><span style="color: #DD0000">'index.tpl'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// now any occurrence of an email address in the template output will have<br />// a simple protection against spambots<br /></span><span style="color: #0000BB">?></span>
</span>
</code></TD
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> See also
<A
HREF="api.register.outputfilter.html"
><TT
CLASS="varname"
>register_outpurfilter()</TT
></A
>,
<A
HREF="api.load.filter.html"
><TT
CLASS="varname"
>load_filter()</TT
></A
>,
<A
HREF="variable.autoload.filters.html"
><TT
CLASS="parameter"
><I
>$autoload_filters</I
></TT
></A
>,
<A
HREF="advanced.features.postfilters.html"
>postfilters</A
> and
<A
HREF="variable.plugins.dir.html"
><TT
CLASS="parameter"
><I
>$plugins_dir</I
></TT
></A
>.
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