Php generates random password program code

There are many methods to generate a random password. The simplest is to use the phpmt_rand () function to directly generate a string of numbers, next I will introduce you to the simplest way to generate a random password program in php. m

There are many methods to generate a random password. The simplest is to use the php mt_rand () function to directly generate a string of numbers. next I will introduce you to the php random password generation program.

The simplest method is the mt_rand function.

Mt_rand () returns a random integer using the Mersenne Twister algorithm.

In this example, we will return some random numbers. the code is as follows:

2. Echo (mt_rand ());
3. Echo (mt_rand ());
4. Echo (mt_rand (10,100 ));
5. ?>
6. // The output is similar:
7. // 3150906288
8. // 513289678
9. // 35

The above is relatively low in the Security Index, because it is all numbers.

1. preset a string $ chars, including A-z, a-Z, 0-9, and some special characters

2. random character in $ chars string

The instance code is as follows:

1. Function generate_password ($ length = 8 ){
2. // Password character set, which can be any character you need
3. $ Chars = 'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789! @ # $ % ^ & * ()-_ [] {}<> ~ '+ = ,.;:/? | ';
4. $ Password = '';
5. For ($ I = 0; $ I <$ length; $ I ++)
6. {
7. // Two character acquisition methods are provided here
8. // Use substr to intercept any character in $ chars;
9. // The second method is to take any element of the character array $ chars.
10. // $ Password. = substr ($ chars, mt_rand (0, strlen ($ chars)-1), 1 );
11. $ Password. = $ chars [mt_rand (0, strlen ($ chars)-1)];
12. }
13. Return $ password;
14. }

Because of the md5 () function returned value provided by a friend, the generated password only contains letters and numbers, but it is also a good method. algorithm idea:

1. time () gets the current Unix timestamp

2. encrypt the timestamp obtained in step 1 with md5 ()

3. extract the data encrypted in step 2 to obtain the desired password.

The instance code is as follows:

1. Function get_password ($ length = 8)
2. {
3. $ Str = substr (md5 (time (), 0, 6 );
4. Return $ str;
5. }