PHP generates 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 directly generate a string of numbers. Now I will introduce to you the php program to generate random passwords

The simplest method is the mt_rand function

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

Example

In this case, we return some random numbers:

35

The code is as follows

代码如下	复制代码
echo(mt_rand()); echo(mt_rand()); echo(mt_rand(10,100)); ?> 输出类似： 3150906288 513289678 35

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echo(mt_rand());

echo(mt_rand());

代码如下

复制代码

function generate_password( $length = 8 ) { // 密码字符集，可任意添加你需要的字符 $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-_ []{}<>~`+=,.;:/?|'; $password = ''; for ( $i = 0; $i < $length; $i++ ) { // 这里提供两种字符获取方式 // 第一种是使用 substr 截取$chars中的任意一位字符； // 第二种是取字符数组 $chars 的任意元素 // $password .= substr($chars, mt_rand(0, strlen($chars) - 1), 1); $password .= $chars[ mt_rand(0, strlen($chars) - 1) ]; } return $password; }

echo(mt_rand(10,100));

?>

Output similar to:

3150906288

代码如下	复制代码
function get_password( $length = 8 ) {     $str = substr(md5(time()), 0, 6);     return $str; }

513289678

The safety index above is relatively low because it is all numbers. Here is another one 1. Preset a string $chars, including a – z, A – Z, 0 – 9, and some special characters 2. Randomly pick a character from the $chars string

The code is as follows

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function generate_password( $length = 8 ) { // Password character set, you can add any characters you need $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-_ []{}<>~`+=,.;:/?|'; $password = ''; for ( $i = 0; $i < $length; $i++ ) { // There are two ways to get characters here

// The first is to use substr to intercept any character in $chars;

//The second 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; } Because of the return value of the md5() function provided by a friend, the generated password only includes letters and numbers, but it is still a good method. Algorithmic thinking: 1. time() gets the current Unix timestamp 2. Encrypt the timestamp obtained in the first step with md5() 3. Use the encryption result of the second step and intercept n digits to get the desired password

The code is as follows

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function get_password( $length = 8 ) { $str = substr(md5(time()), 0, 6); Return $str; } http://www.bkjia.com/PHPjc/631273.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631273.htmlTechArticleThere are many ways to generate random passwords. The simplest is to use the php mt_rand() function to directly generate a string of numbers. Okay, let me introduce to you the simplest way to generate a random password using PHP...