smarty/docs/en/language-snippets.ent

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<!ENTITY note.parameter.merge '<note>
 <title>Technical Note</title>
 <para>
  The <parameter>merge</parameter> parameter respects array keys, so if
  you merge two numerically indexed arrays, they may overwrite each other
  or result in non-sequential keys. This is unlike the
  <ulink url="&url.php-manual;array_merge">array_merge()</ulink> function
  of PHP which wipes out numerical keys and renumbers them.
 </para>
</note>'>

<!ENTITY parameter.compileid '<para>
 As an optional third parameter, you can pass a
 <parameter>$compile_id</parameter>.
 This is in the event that you want to compile different versions of
 the same template, such as having separate templates compiled
 for different languages. Another use for
 <parameter>$compile_id</parameter> is when you use more than one
 <link linkend="variable.template.dir">$template_dir</link>
 but only one <link linkend="variable.compile.dir">$compile_dir</link>.
 Set a separate <parameter>$compile_id</parameter> for each
 <link linkend="variable.template.dir">$template_dir</link>, otherwise
 templates of the same name will overwrite each other. You can
 also set the <link linkend="variable.compile.id">$compile_id</link>
 variable once instead of passing this to each call to this function.
</para>'>