shared.literal_compiler_param.php

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<?php
function smarty_literal_compiler_param($params, $index, $default=null)
{
    // not set, go default
    if (!isset($params[$index])) {
        return $default;
    }
    // test if param is a literal
    if (!preg_match('/^([\'"]?)[a-zA-Z0-9]+(\\1)$/', $params[$index])) {
        throw new SmartyException('$param[' . $index . '] is not a literal and is thus not evaluatable at compile time');
    }

    $t = null;
    eval("\$t = " . $params[$index] . ";");
    return $t;
}