PHP Generate random Password program code _php tutorial

There are many ways to generate random passwords, the simplest is to use the PHP Mt_rand () function to generate a series of numbers directly, let me introduce you to PHP generated random password program

The simplest way to mt_rand a function

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

Example

In this case, we will return some random numbers:

The code is as follows	Copy Code
Echo (Mt_rand ()); Echo (Mt_rand ()); Echo (Mt_rand (10,100)); ?> The output is similar to: 3150906288 513289678 35

The above relative safety index is very low, because all is the number Oh, the following another name

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

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 + +) { //Here are two ways to get a character //The first is to use SUBSTR to intercept any one character in $chars; //The second is the number of characters to take Any element of the group $chars //$password. = substr ($chars, Mt_rand (0, strlen ($chars)-1), 1); $password. = $chars [Mt_rand (0, strlen ($chars)-1)]; } return $password; }

A friend provides the return value of the MD5 () function, and the generated password only includes letters and numbers, but it's also a good idea. Algorithm idea:
1. Time () Gets the current Unix timestamp
2, the first step to obtain the timestamp for MD5 () encryption
3, the second step to encrypt the result, intercept n-bit is the desired password

The code is as follows	Copy Code
function Get_password ($length = 8) { $STR = substr (MD5 (Time ()), 0, 6); return $str; }

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