Methods for generating random passwords in php _ PHP Tutorial

Php generates random passwords. When you want to generate a random password, you may first think of using the uniquid () function, but if we use array_rand () and range (), you can achieve this perfectly. when you want to generate a random password, you may first think of using the uniquid () function, but if we use array_rand () and range.

Method 1,

The code is as follows:

Header ("Content-type: text/html; charset = utf-8 "); Function randCode ($ length ){ $ Ranges = array (range ('A', 'z'), range ('A', 'z'), range (1, 9 )); $ Code = ''; For ($ I = 0; $ I <$ length; $ I ++ ){ $ Rkey = array_rand ($ ranges ); $ Vkey = array_rand ($ ranges [$ rkey]); $ Code. = $ ranges [$ rkey] [$ vkey]; } Return $ code; } Echo "www. bKjia. c0m "; Echo randCode (5); // outputs such as 3IxY8, E6HOv, and 1qHiy ?>

Method 2,

1. Generate a random integer in 33-126, for example, 35,

2. convert 35 to corresponding ASCII characters, for example, 35 #

3. Repeat steps 1 and 2 n and connect them to a n-bit password.

This algorithm mainly uses two functions. the mt_rand (int $ min, int $ max) function is used to generate random integers, where $ min-$ max is the ASCII code range, here, the range is 33-126. you can adjust the range as needed. for example, 97-122 characters in the ASCII code table correspond to English letters a-z. for details, refer to the ASCII code table. chr (int $ ascii) the function is used to convert the corresponding integer $ ascii to the corresponding character.

The code is as follows:
Function create_password ($ pw_length = 8) { $ Randpwd = ''; For ($ I = 0; $ I <$ pw_length; $ I ++) { $ Randpwd. = chr (mt_rand (33,126 )); } Return $ randpwd; } // Call this function to pass the length parameter $ pw_length = 6 Echo create_password (6 );

Method 3,

The code is as follows:

// Automatically generate a random user name for the user (length: 6-13) Function create_password ($ pw_length = 4 ){ $ Randpwd = ''; For ($ I = 0; $ I <$ pw_length; $ I ++ ){ $ Randpwd. = chr (mt_rand (33,126 )); } Return $ randpwd; } Function generate_username ($ length = 6 ){ // Password character set, which can be any character you need $ Chars = 'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789! @ # $ % ^ & * ()-_ [] {}<> ~ '+ = ,.;:/? | '; $ Password = ''; For ($ I = 0; $ I <$ length; $ I ++) { // Two character acquisition methods are provided here // Use substr to intercept any character in $ chars; // The second method is to take any element of the character array $ chars. // $ Password. = substr ($ chars, mt_rand (0, strlen ($ chars)-1), 1 ); $ Password. = $ chars [mt_rand (0, strlen ($ chars)-1)]; } Return $ password; } // Call this function $ UserId = 'user'. generate_username (6 ); $ Pwd = create_password (9 );

Except uniquid () function, but if we use array_rand () and range (), we can implement this perfectly...