php smarty模板UTF8 truncate 乱码解决

发表于 2014-06-12 09:23:41 by 月小升

估计不少玩smarty模板的小朋友都遇到过裁切乱码问题。
特别是UTF8编码的

以下代码保存为modifier.truncate2.php 存到smarty libs下的plugin目录下

然后裁剪的时候用$v->content|truncate2:100

就搞定了。

如果不好用可能是缓存导致，请速度删除templates_c下的缓存文件（月小升搞的时候遇到缓存问题。）

 * Name:     truncate

 * Purpose:  Truncate a string to a certain length if necessary,
 *           optionally splitting in the middle of a word, and
 *           appending the $etc string or inserting $etc into the middle.
 * @link http://smarty.php.net/manual/en/language.modifier.truncate.php
 *          truncate (Smarty online manual)
 * @author   Monte Ohrt 
 * @param string
 * @param integer
 * @param string
 * @param boolean
 * @param boolean
 * @return string
 */
function smarty_modifier_truncate2( $string,$length = 80,$etc='...',$count_words = true ) {
	return $returnstr =substr_utf8($string, 0, $length).$etc; 
       
}

function substr_utf8($str, $start=0, $length=-1, $return_ary=false) {
    $len = strlen($str);if ($length == -1) $length = $len;
    $r = array();
    $n = 0;
    $m = 0;
    
    for($i = 0; $i < $len; $i++) {
        $x = substr($str, $i, 1);
        $a = base_convert(ord($x), 10, 2);
        $a = substr('00000000'.$a, -8);
        if ($n < $start) {
            if (substr($a, 0, 1) == 0) {
            }elseif (substr($a, 0, 3) == 110) {
                $i += 1;
            }elseif (substr($a, 0, 4) == 1110) {
                $i += 2;
            }
            $n++;
        }else {
            if (substr($a, 0, 1) == 0) {
                $r[] = substr($str, $i, 1);
            }elseif (substr($a, 0, 3) == 110) {
                $r[] = substr($str, $i, 2);
                $i += 1;
            }elseif (substr($a, 0, 4) == 1110) {
                $r[] = substr($str, $i, 3);
                $i += 2;
            }else {
                $r[] = '';
            }
            if (++$m >= $length) {
                break;
            }
        }
    }
    
    return $return_ary ? $r : implode("",$r);
}
/* vim: set expandtab: */
?>

samrty的插件体系还是比较智能而且容易修改的。

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首发地址：月小升博客 – https://java-er.com/blog/smarty-truncate-code/
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