PHP generates random string program code

Because the tool requires us to write a function that can generate random strings. I think there should be a lot of such random string generation functions on the internet. Baidu has a bunch of functions. below I will summarize them for you.

Because the tool requires us to write a function that can generate random strings. I think there should be a lot of such random string generation functions on the Internet, baidu has a bunch of good php functions below.

Use the for loop to traverse the defined characters. the code is as follows:

2. /* Generate Password
3. * Length: 8
4. */
5. $ Str = "0123456789abcdefghijklmnopqrstuvwxyz"; // output character set
6. $ N = 8; // output string length
7. $ Len = strlen ($ str)-1;
8. For ($ I = 0; $ I <$ n; $ I ++ ){
9. $ S. = $ str [rand (0, $ len)];
10. }
11. Echo $ s."
    ";
12. ?>

You can generate a string of numbers, character strings, and so on (uppercase, lowercase, uppercase, and lowercase, and a combination of uppercase and lowercase numbers can also be expanded as needed ).

The following $ length = 5 is 10 digits if you change it to 10.

Change $ str = 'abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz 'to $ str = '000000'. the code is as follows:

2. Function getRandStr ($ length ){
3. $ Str = 'abcdefghijklmnopqrstuvwxyz0123456789abcdefghijklmnopqrstuvwxyz ';
4. $ RandString = '';
5. $ Len = strlen ($ str)-1;
6. For ($ I = 0; $ I <$ length; $ I ++ ){
7. $ Num = mt_rand (0, $ len );
8. $ RandString. = $ str [$ num];
9. }
10. Return $ randString;
11. }
12. // Use the following method:
13. $ Test = getRandStr ($ length = 5 );
14. Echo $ test;
15. ?>

Or use while, the code is as follows:

2. /**
3. */
4. Function createRandomStr ($ length ){
5. $ Str = '0123456789abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz '; // 62 characters
6. $ Strlen = 62;
7. While ($ length> $ strlen ){
8. $ Str. = $ str;
9. $ Strlen + = 62;
10. }
11. $ Str = str_shuffle ($ str );
12. Return substr ($ str, 0, $ length );
13. }
14. Echo createRandomStr (10 );
15. ?>

The code of array and character conversion is as follows:

2. /**
3. * @ Blog
4. */
5. Function createRandomStr ($ length ){
6. $ Str = array_merge (range (0, 9), range ('A', 'z'), range ('A', 'z '));
7. Shuffle ($ str );
8. $ Str = implode ('', array_slice ($ str, 0, $ length ));
9. Return $ str;
10. }
11. Echo createRandomStr (10 );
12. ?>