php将一个字符串部分字符用*替代隐藏

<?php 
  
/**
 +----------------------------------------------------------
 * 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
 * @param string $glue  分割符
 +----------------------------------------------------------
 * @return string 处理后的字符串
 +----------------------------------------------------------
 */
function hideStr($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);
        $array[0] = hideStr($array[0], $bengin, $len, 1);
        $string = implode($glue, $array);
    } else if ($type == 3) {
        $array = explode($glue, $string);
        $array[1] = hideStr($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];
        }
        $array = array_chunk(array_reverse($array), $right);
        $array = array_reverse($array[0]);
        for ($i = 0; $i < $right; $i++) {
            $tem[] = $array[$i];
        }
        $string = implode("", $tem);
    }
    return $string;
}
  
  
$str = '12345678901';
echo hideStr($str,2,4);

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