<?php
if (!function_exists('hide_str')) {
    /**
    +----------------------------------------------------------
     * 将一个字符串部分字符用*替代隐藏
    +----------------------------------------------------------
     * @param string    $string   待转换的字符串
     * @param int       $bengin   起始位置,从0开始计数,当$type=4时,表示左侧保留长度
     * @param int       $len      需要转换成*的字符个数,当$type=4时,表示右侧保留长度
     * @param int       $type     转换类型:0,从左向右隐藏;1,从右向左隐藏;2,从指定字符位置分割前由右向左隐藏;3,从指定字符位置分割后由左向右隐藏;4,保留首末指定字符串中间用***代替
     * @param string    $glue     分割符
    +----------------------------------------------------------
     * @return string   处理后的字符串
    +----------------------------------------------------------
     */
    function hide_str($string, $bengin=0, $len = 4, $type = 0, $glue = "@") {
        if (empty($string))
            return false;
        $array = array();
        if ($type == 0 || $type == 1 || $type == 4) {
            $strlen = $length = mb_strlen($string);
            while ($strlen) {
                $array[] = mb_substr($string, 0, 1, "utf8");
                $string = mb_substr($string, 1, $strlen, "utf8");
                $strlen = mb_strlen($string);
            }
        }
        if ($type == 0) {
            for ($i = $bengin; $i < ($bengin + $len); $i++) {
                if (isset($array[$i])) $array[$i] = "*";
            }
            $string = implode("", $array);
        }else if ($type == 1) {
            $array = array_reverse($array);
            for ($i = $bengin; $i < ($bengin + $len); $i++) {
                if (isset($array[$i])) $array[$i] = "*";
            }
            $string = implode("", array_reverse($array));
        }else if ($type == 2) {
            $array = explode($glue, $string);
            if (isset($array[0])) {
                $array[0] = hide_str($array[0], $bengin, $len, 1);
            }
            $string = implode($glue, $array);
        } else if ($type == 3) {
            $array = explode($glue, $string);
            if (isset($array[1])) {
                $array[1] = hide_str($array[1], $bengin, $len, 0);
            }
            $string = implode($glue, $array);
        } else if ($type == 4) {
            $left = $bengin;
            $right = $len;
            $tem = array();
            for ($i = 0; $i < ($length - $right); $i++) {
                if (isset($array[$i])) $tem[] = $i >= $left ? "" : $array[$i];
            }
            $tem[] = '*****';
            $array = array_chunk(array_reverse($array), $right);
            $array = array_reverse($array[0]);
            for ($i = 0; $i < $right; $i++) {
                if (isset($array[$i])) $tem[] = $array[$i];
            }
            $string = implode("", $tem);
        }
        return $string;
    }
}
最后修改:2018 年 02 月 11 日 11 : 29 AM
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