trimStr、ltrimStr、rtrimStr

  $len1) return trim($str);
        $str = ltrimStr($str, $list);
        $str = rtrimStr($str, $list);
        return $str;
    }
}

/*
 * ltrim 字符串
 * 类似 php 函数 ltrim
 * @see http://ramble.3vshej.cn/php-trim-is-a-pit/ PHP TRIM 是个坑 大坑
 * @param string $str 源字符
 * @param string $list 待清除字符
 * @return string
*/
if ( ! function_exists('ltrimStr'))
{
    function ltrimStr($str, $list='') {

        $list = (string) $list;
        if (!isset($list[0])) return ltrim($str);
        $len1 = strlen($str);
        $len2 = strlen($list);
        if ($len2 > $len1) return ltrim($str);

        $s = '';
        do {
            $s = substr($str, 0, $len2);
            if ($s == $list) $str = substr($str, $len2);
        } while($s == $list);

        return $str;

    }
}

/*
 * rtrim 字符串
 * 类似 php 函数 rtrim
 * @see http://ramble.3vshej.cn/php-trim-is-a-pit/ PHP TRIM 是个坑 大坑
 * @param string $str 源字符
 * @param string $list 待清除字符
 * @return string
*/
if ( ! function_exists('rtrimStr'))
{
    function rtrimStr($str, $list='') {
        $list = (string) $list;
        if (!isset($list[0])) return rtrim($str);
        $len1 = strlen($str);
        $len2 = strlen($list);
        if ($len2 > $len1) return rtrim($str);
        $s = '';
        do {
            $s = substr($str, -$len2);
            if ($s == $list) $str = substr($str, 0, -$len2);
        } while($s == $list);

        return $str;
    }
}
?>