shared.escape_special_chars.php

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<?php
if (version_compare(PHP_VERSION, '5.2.3', '>=')) {
    function smarty_function_escape_special_chars($string)
    {
        if (!is_array($string)) {
            $string = htmlspecialchars($string, ENT_COMPAT, Smarty::$_CHARSET, false);
        }
        return $string;
    }  
} else {         
    function smarty_function_escape_special_chars($string)
    {
        if (!is_array($string)) {
            $string = preg_replace('!&(#?\w+);!', '%%%SMARTY_START%%%\\1%%%SMARTY_END%%%', $string);
            $string = htmlspecialchars($string);
            $string = str_replace(array('%%%SMARTY_START%%%', '%%%SMARTY_END%%%'), array('&', ';'), $string); 
        }
        return $string;
    }                                                                                                             
} 

?>