Examples of methods to prevent collection of PHP encrypted URLs

This article mainly shares with you examples of methods to prevent collection of PHP encrypted URLs. I hope it can help everyone.

There are many collection tools on the Internet, how do they collect them.

These URLs are very regular and are composed of (blog-) + numbers. The collection uses this URL pattern to automatically collect web pages to a large extent.

How to better prevent the website from being collected? We can encrypt the (key number) part of the URL.

Provides encryption method, the generated encrypted URL is short, stable, non-random number encryption method, friendly to SEO. The algorithm does its own research.

/**
 * 加密数字方法
 *   echo idEncode(222);
 * @author uuleaf[<uuleaf#163.com>] 小叶
 * @param int $int 要加密的数字
 * @return string 加密后的字符串
 */
function idEncode($int)  
{  
    $str = md5($int);  
    $sarr = str_split($str);  
    $stai = (ord($str) + 8) % 10;  
    if ($stai == 0) $stai = 8;  
    $idstr = base_convert($int * $stai, 10, 32);  
    $str1 = substr($str, 10, 2);  
    $str2 = substr($str, 14, 2);  
    $str3 = substr($str, 18, 2);  
    return $str1 . $idstr . $str2 . $stai . $str3;  
}  

解密方法

/**
 * 解密数字方法
 *   echo idDncode("");
 * @author uuleaf[<uuleaf#163.com>] 小叶
 * @param string $str 要解密的数字
 * @return int 解密后的数字
 */
function idDecode($str)  
{  
    $idstr = substr(substr($str, 2), 0, -5);  
    $ji = base_convert($idstr, 32, 10);  
    $si = (int)substr($str, -3, -2);  
    return floor($ji / $si);  
}

Test

1. echo "加密前的网址：http://thinkphp.cn/blog-54.html";  
   echo "\n";  
   $encode_str = idEncode(54);  
   echo "加密后的网址：http://thinkphp.cn/blog-{$encode_str}.html";  
   echo "\n";  
   $decode_str = idDecode($encode_str);  
   echo "还原后的网址：http://thinkphp.cn/blog-{$decode_str}.html";

Output result        

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