Several random password generation methods_PHP tutorial-PHP Tutorial-php.cn

Several random password generation methods_PHP tutorial

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Release： 2016-07-13 17:10:20

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Random passwords are very simple, but there are many ways to follow them. They are all composed of special strings. Let’s take a look at the following three methods.

Method 1:

1. Generate a random integer from 33 – 126, such as 35,

2. Convert 35 into the corresponding ASCII code character, such as 35 corresponding to #

3. Repeat the above steps 1 and 2 n times to connect into an n-digit 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 range of ASCII codes. Here it is 33-126, which can be used as needed. Adjustment range, for example, 97 – 122 bits in the ASCII code table correspond to the English letters a – z. For details, please refer to the ASCII code table; chr (int $ascii) function is used to convert the corresponding integer $ascii into the corresponding character.

The code is as follows

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代码如下

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function create_password($pw_length = 8)
{
$randpwd = '';
for ($i = 0; $i < $pw_length; $i++)
{
$randpwd .= chr(mt_rand(33, 126));
}
return $randpwd;
}

// 调用该函数，传递长度参数$pw_length = 6
echo create_password(6);

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 and pass the length parameter $pw_length = 6
echo create_password(6);

Method 2:

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

3. Repeat the second step n times to get a password of length n

代码如下

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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;
}

<🎜> <🎜>

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 obtain characters
// The first is to 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;
}<🎜> <🎜> <🎜>

Using PHP to develop applications, especially website programs, often requires generating random passwords. For example, a random password is generated for user registration, and a random password is also required for user reset password. A random password is a string of fixed length. Here I have collected several methods of generating random strings for your reference.

Method 1:

1. Generate a random integer from 33 – 126, such as 35,

2. Convert 35 into the corresponding ASCII code character, such as 35 corresponding to #

3. Repeat the above steps 1 and 2 n times to connect into an n-digit password

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

The code is as follows

代码如下

复制代码

function create_password($pw_length = 8)
{
$randpwd = '';
for ($i = 0; $i < $pw_length; $i++)
{
$randpwd .= chr(mt_rand(33, 126));
}
return $randpwd;
}

// 调用该函数，传递长度参数$pw_length = 6
echo create_password(6);

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 and pass the length parameter $pw_length = 6
echo create_password(6);

Method 2:

代码如下

复制代码

return $password;
}

2. Randomly pick a character from the $chars string

3. Repeat the second step n times to get a password of length n