smartyからssi呼び出し。テンプレと出力が異文字コード。 ref: http://qiita.com/mrk461/items/016822ebf827f8b7b31e

function.ssi.php

<?php

/**
 * ssi
 */
function smarty_function_ssi($params, &$smarty)
{

    if (empty($params['file'])) return '';
    if (empty($params['ssi_enc'])) return '';
    if (!file_exists($params['file'])) return '<!-- no file -->';

    $ssi = file_get_contents($params['file']);
    if (false === $ssi) return '';

    /*
    echo "<!--", PHP_EOL;
    echo "******************************", PHP_EOL;
    echo $ssi, PHP_EOL;
    echo "******************************", PHP_EOL;
    echo "-->", PHP_EOL;
    */

    $ret = mb_convert_encoding($ssi, mb_internal_encoding(), $params['ssi_enc']);

    /*
    echo "<!--", PHP_EOL;
    echo "******************************", PHP_EOL;
    echo $ret, PHP_EOL;
    echo "******************************", PHP_EOL;
    echo "-->", PHP_EOL;
    */

    return $ret;
}

test.tpl

{ssi file="../design/ssi/head.html" ssi_enc="SJIS"}