<?php
/**
 * Str.php
 * Created on 2020/9/7 15:23
 * Create by Wpeishi
 */

namespace App\Handlers;


class Str
{
    /**
     * 获取随机字符串
     * @param int $length 长度
     * @param string $type 类型
     * @param int $convert 转换大小写
     * @return string 随机字符串
     */
    public static function random($length = 6, $type = 'string', $convert = 0)
    {
        $config = array(
            'number' => '1234567890',
            'letter' => 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
            'string' => 'abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ23456789',
            'all' => 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890'
        );

        if (!isset($config[$type]))
            $type = 'string';
        $string = $config[$type];

        $code = '';
        $strlen = strlen($string) - 1;
        for ($i = 0; $i < $length; $i++) {
            $code .= $string{mt_rand(0, $strlen)};
        }
        if (!empty($convert)) {
            $code = ($convert > 0) ? strtoupper($code) : strtolower($code);
        }
        return $code;
    }

    /**
     * 生成唯一不重复 32 位字符串
     */
    public static function uniqueString()
    {
        return md5(uniqid(microtime(true), true));
    }

    /**
     * 返回两位数字母
     * @param $in_array
     * @return string
     */
    public static function getChr($in_array)
    {
        $return_sta = chr(rand(65, 90)) . chr(rand(65, 90));
        if (!count($in_array) || !in_array($return_sta, $in_array)) {
            return $return_sta;
        }
        $str = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'L', 'M', 'N'];

        for ($i = 0; $i < strlen((string)$str); $i++) {
            for ($j = 0; $j < strlen((string)$str); $j++) {
                if (!in_array($str[$i] . $str[$j], $in_array)) {
                    return $str[$i] . $str[$j];
                    continue;
                }
            }
        }
    }

}