<?php

namespace App\Tools;
class Tools
{

    //生成随机数
    public static function generateRandStr($length = 8)
    {
        $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789=-+';
        $str = '';
        for ($i = 0; $i < $length; $i++) {
            $str .= $chars[mt_rand(0, strlen($chars) - 1)];
        }
        return $str;
    }

    static function filterDataParams($aData, $aParams)
    {
        foreach ($aParams as $sParam) {
            if (isset($aData[$sParam])) {
                $aData[$sParam] = self::hideStr($aData[$sParam]);
            }
        }
        return $aData;
    }

    //字符串敏感部分中间隐藏
    static function hideStr($sStr, $iStart = 5, $iEnd = 3, $sReplace = '*')
    {
        if (empty($sStr)) return $sStr;
        $iStrLen = mb_strlen($sStr);
        if ($iStrLen <= $iStart) return $sStr;
        $iEnd = $iEnd > 0 ? $iEnd : $iStrLen - $iStart;
        $sHideStr = '';
        for ($i = 0; $i < $iEnd; $i++) {
            $sHideStr .= $sReplace;
        }
        return mb_substr($sStr, 0, $iStart) . $sHideStr . mb_substr($sStr, $iStart + $iEnd);
    }


}