Are there any great gods ?? Reversible dynamic encryption function (2-WAYPHP version)

Are there any great gods ?? Find reversible dynamic encryption function (2-WAYPHP version) http://www.xxx.tld /? User = K5idDC
Http://www.xxx.tld /? User = 2RK4dm
Http://www.xxx.tld /? User = 3 weolap
Http://www.xxx.tld /? User = Login mf3 ......

For example, the values of the preceding user parameters all point to the data page of the same user name (ABCD). there is a dynamic reversible function that enables a user name to correspond to thousands of encrypted characters. if there is no reversible function, if you need a database to store the corresponding relationship, it is very troublesome!

The requirements are as follows:
1. a refresh can be changed once and reversible;
2. the length of the encrypted content is about the same as that of the encrypted content;

Do you know such a function? Do you have any idea? Please share it. thank you!

The encrypted password of the DZ function searched on the Internet is too long to be used as a URL.

Reply to discussion (solution)

For ($ I = 0; $ I <10; $ I ++) {echo $ m = encode ('ABCD'); echo ':'. decode ($ m ). PHP_EOL;} function encode ($ s) {$ d = array_map ('chr', range (0x21, 0x7e); $ len = count ($ d ); $ t = rand (0, $ len); $ r = $ d [$ t]; for ($ I = 0; $ I
 
  
Iijkl: ABCD
  
3 STUV: ABCD
  
) IJKL: ABCD
  
) IJKL: ABCD
  
Ddefg: ABCD
  
Zz {|}: ABCD
  
@ 'ABC: ABCD
  
O1234: ABCD
  
J,-./: ABCD
  
3 STUV: ABCD
  
 
  
 
  
  
  
   
  
For ($ I = 0; $ I <10; $ I ++) {echo $ m = encode ('ABCD'); echo ':'. decode ($ m ). PHP_EOL;} function encode ($ s) {$ d = array_map ('chr', range (0x21, 0x7e); $ len = count ($ d ); $ t = rand (0, $ len); $ r = $ d [$ t]; for ($ I = 0; $ I
   
    
Iijkl: ABCD
    
3 STUV: ABCD
    
) IJKL: ABCD
    
) IJKL: ABCD
    
Ddefg: ABCD
    
Zz {|}: ABCD
    
@ 'ABC: ABCD
    
O1234: ABCD
    
J,-./: ABCD
    
3 STUV: ABCD
    
  
    
  
    
Great Gods are strong here! Thank you! Is there a way to remove special symbols? Is it not good to use the URL?
    
 
    
Just put it in the project. If the character has/, rewrite will cause an error.
 
    
There is a high probability that a number will appear. Is there any way to prevent it from having special characters?
 
    
The array $ d in the function is a list of all allowed characters. in my example, all printable ASCII characters (excluding spaces)
You can adjust the scale according to your needs
 
    
Adjust the code
    
/* // Generate a random dictionary $ d = str_split ('2017 _ abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxy'); shuffle ($ d); echo join ('', $ d ). PHP_EOL; */define ('dict ', 'hpke6f0vwb8cc3ha _ done'); for ($ I = 0; $ I <10; $ I ++) {echo $ m = encode ('ABC'); echo ':'. decode ($ m ). PHP_EOL;} function encode ($ s) {$ d = str_split (DICT); $ len = count ($ d); $ t = rand (0, $ len ); $ r = $ d [$ t]; for ($ I = 0; $ I
     
      
OTfuH: ABCD
      
OUkI5: ABCD
      
CiN5V: ABCD
      
6 Kvan: ABCD
      
4gzj3: ABCD
      
Un6vP: ABCD
      
So1Vw: ABCD
      
MYyhZ: ABCD
      
Z_YDr: ABCD
      
FBr_h: ABCD
      
 
      
 
      
  
      
Adjust the code
      
/* // Generate a random dictionary $ d = str_split ('2017 _ abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxy'); shuffle ($ d); echo join ('', $ d ). PHP_EOL; */define ('dict ', 'hpke6f0vwb8cc3ha _ done'); for ($ I = 0; $ I <10; $ I ++) {echo $ m = encode ('ABC'); echo ':'. decode ($ m ). PHP_EOL;} function encode ($ s) {$ d = str_split (DICT); $ len = count ($ d); $ t = rand (0, $ len ); $ r = $ d [$ t]; for ($ I = 0; $ I
       
        
OTfuH: ABCD
        
OUkI5: ABCD
        
CiN5V: ABCD
        
6 Kvan: ABCD
        
4gzj3: ABCD
        
Un6vP: ABCD
        
So1Vw: ABCD
        
MYyhZ: ABCD
        
Z_YDr: ABCD
        
FBr_h: ABCD
        
  
        
Thank you! I just want this. what is the corresponding decode? I have a very good algorithm!
        
 
        
Oh, I missed it.
        
Function decode ($ s) {$ d = str_split (DICT); $ len = count ($ d); $ r = ''; $ t = array_search ($ s {0}, $ d); for ($ I = 1; $ I
          
          
 
          
  
          
Oh, I missed it.
          
Function decode ($ s) {$ d = str_split (DICT); $ len = count ($ d); $ r = ''; $ t = array_search ($ s {0}, $ d); for ($ I = 1; $ I
             
            
  
            
  
            
9 SpQl: ABCD
            
YDhBY: ABCD
            
LctwQ: ABCD
            
DEWGj: ABCD
            
Xf2qO: ABCD
            
ABCD: Fry
            
VIi4k: ABCD
            
EtlSL: ABCD
            
Un6vP: ABCD
            
PXnKM: ABCD
            
  
            
Thank you! It's almost perfect. what is lacking in the United States is the occasional situation of "ABCD: Fry.
            
Now, you can use the stupid method to filter out the results. first, for 10 times, you can obtain one correct one by one.
            
 
            
Follow up on this.
4 Characters in plaintext and 5 characters in ciphertext. for plaintext ABCD, the ciphertext ABCD is obviously missing one character.
 
            
  
            
function get_encode($s){    $en_s = encode($s);    if($en_s == $s) {        return get_encode($s);    }else {        return $en_s;    }}
  
            
The recursion efficiency is better, and the knowledge of encryption and decryption algorithms is almost 0. after the project is completed, I will try it out. do you have any books to recommend!
            
 
            
  
            
   
            
    
Oh, I missed it.
            
Function decode ($ s) {$ d = str_split (DICT); $ len = count ($ d); $ r = ''; $ t = array_search ($ s {0}, $ d); for ($ I = 1; $ I
                
              
   
              
   
              
9 SpQl: ABCD
              
YDhBY: ABCD
              
LctwQ: ABCD
              
DEWGj: ABCD
              
Xf2qO: ABCD
              
ABCD: Fry
              
VIi4k: ABCD
              
EtlSL: ABCD
              
Un6vP: ABCD
              
PXnKM: ABCD
              
   
              
Thank you! It's almost perfect. what is lacking in the United States is the occasional situation of "ABCD: Fry.
              
Now, you can use the stupid method to filter out the results. first, for 10 times, you can obtain one correct one by one.
              
  
              
  
              
It is $ t = rand (0, $ len) during encryption; here it is wrong, it should be $ t = rand (0, $ len-1 );
              
 
              
  
              
   
              
    
    
              
     
Oh, I missed it.
              
Function decode ($ s) {$ d = str_split (DICT); $ len = count ($ d); $ r = ''; $ t = array_search ($ s {0}, $ d); for ($ I = 1; $ I
                   
                
    
                
    
                
9 SpQl: ABCD
                
YDhBY: ABCD
                
LctwQ: ABCD
                
DEWGj: ABCD
                
Xf2qO: ABCD
                
ABCD: Fry
                
VIi4k: ABCD
                
EtlSL: ABCD
                
Un6vP: ABCD
                
PXnKM: ABCD
                
    
                
Thank you! It's almost perfect. what is lacking in the United States is the occasional situation of "ABCD: Fry.
                
Now, you can use the stupid method to filter out the results. first, for 10 times, you can obtain one correct one by one.
                
   
                
   
                
It is $ t = rand (0, $ len) during encryption; here it is wrong, it should be $ t = rand (0, $ len-1 );
                
  
                
No one answered the question in PHPCHINA for a few days. it was solved in these hours !! Thank you!