Several methods of random password generation _php tutorial

Random passwords are simple, but there are a lot of places to follow, all made up of special strings, let's look at the following three ways.

Method One:

1, generate a random integer in the 33–126, such as 35,

2, convert 35 to the corresponding ASCII character, such as 35 corresponding #

3, repeat the above 1, 2 steps n times, connected to n-bit password

The algorithm mainly uses two functions, Mt_rand (int $min, int $max) function is used to generate random integers, where $min – $max the range of ASCII code, here take 33-126, you can adjust the range as necessary, such as the ASCII code table 97– 122 digits corresponding to the a–z of the English alphabet, specific reference to the ASCII code table; the Chr (int $ascii) function is used to convert the corresponding integer $ascii to the corresponding character.

The code is as follows	Copy Code
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, pass length parameter $pw_length = 6 Echo Create_password (6);

Method Two:

1. Preset a string $chars, including a–z,a–z,0–9, and some special characters

2. Randomly take a character in a $chars string

3, repeat the second step n times, can get the length of the password of n

copy code

function Generate_password ($length = 8) { Password character set, you can add any character you need $chars = ' abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&* ()-_ [ ]{}<>~ ' +=,.;:/?| '; $password = '; for ($i = 0; $i < $length; $i + +) { //provides two ways to get a character here //The first is to use SUBSTR to intercept any one character in the $chars; //The second is the word-taking Any element //$password. = substr ($chars, Mt_rand (0, strlen ($chars)-1), 1), $password. = $chars [Mt_rand (0 , strlen ($chars)-1)]; } return $password; }

Using PHP to develop applications, especially Web applications, often requires the generation of random passwords, such as user registration to generate random passwords, user reset password also need to generate a random password. Random password is a string of fixed length, here I collected several methods to generate random strings, for your reference.

Method One:

1, generate a random integer in the 33–126, such as 35,

2, convert 35 to the corresponding ASCII character, such as 35 corresponding #

3, repeat the above 1, 2 steps n times, connected to n-bit password

The algorithm mainly uses two functions, Mt_rand (int $min, int $max) function is used to generate random integers, where $min – $max the range of ASCII code, here take 33-126, you can adjust the range as necessary, such as the ASCII code table 97– 122 digits corresponding to the a–z of the English alphabet, specific reference to the ASCII code table; the Chr (int $ascii) function is used to convert the corresponding integer $ascii to the corresponding character.

The code is as follows	Copy Code
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, pass length parameter $pw_length = 6 Echo Create_password (6);

Method Two:

1. Preset a string $chars, including a–z,a–z,0–9, and some special characters

2. Randomly take a character in a $chars string

3, repeat the second step n times, can get the length of the password of n

copy code

function Generate_password ($length = 8) { Password character set, you can add any character you need $chars = ' abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&* ()-_ [ ]{}<>~ ' +=,.;:/?| '; $password = '; for ($i = 0; $i < $length; $i + +) { //provides two ways to get a character here //The first is to use SUBSTR to intercept any one character in the $chars; //The second is the word-taking Any element //$password. = substr ($chars, Mt_rand (0, strlen ($chars)-1), 1), $password. = $chars [Mt_rand (0 , strlen ($chars)-1)]; } return $password; }

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