Method one
1. generates a random integer of 33–126, such as 35.
2. Convert 35 into corresponding ASCII characters, such as 35 corresponding to #.
3. Repeat the above steps 1 and 2n times to connect into an 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 value range of ASCII code, where 33-126 is taken, and the value range can be adjusted as required, such as the English letters a-z corresponding to 97- 122 in the ASCII code table. Chr (int $ascii) function is used to convert the corresponding integer $ascii into the corresponding characters.
Function? create_password($pw_length？ =?
{?
$randpwd？ =? "; ?
For what? ($i？ =? 0; ? $i？ & lt？ $ pw _ length？ $i++)？
{?
$randpwd？ . =? chr(mt_rand(33，？ 126)); ?
}?
Return? $ randpwd？
}?
//? Call this function, passing 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 select a character in the $chars string.
3. Repeat the second step for n times to obtain a password with a length of n. ..
Function? Generate _ Password (? $ length? =? 8? )? {?
//? Password character set, you can add any characters you need?
$chars？ =? abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz 0 123456789！ @#$%^&； *()-_? []{ } & lt； & gt~`+=,.； :/? |'; ?
$password？ =? "; ?
For what? (? $i？ =? 0; ? $i？ & lt？ $ length; ? $i++？ )?
{?
//? There are two ways to get characters.
//? The first is to use? substr？ Intercept any character in $chars; ?
//? The second is to take a character array? $chars？ Any element?
//? $password？ . =? substr($chars，？ mt_rand(0，？ strlen($chars)？ –? 1),? 1); ?
$password？ . =? $chars[？ mt_rand(0，？ strlen($chars)？ -? 1)? ]; ?
}?
Return? $ password？
} Method 3
1, preset a character array $chars, including a–z, a–z, 0–9, and some special characters.
2. Randomly select the $length element from the array $chars through array_rand ().
3. According to the obtained key name array $keys, take out the character splicing string from the array $chars. The disadvantage of this method is that it will not take the same characters repeatedly.
Function? make_password(？ $ length? =? 8? )?
{?
//? Password character set, you can add any characters you need?
$chars？ =? Array ('a',? b '，？ c '，？ d '，？ e '，？ f '，？ g '，？ h '，？
Me',? j '，？ k '，？ l '，' m '，？ n '，？ Oh,,? p '，？ q '，？ r '，？ s '，？
t '，？ u '，？ v '，？ w '，？ x '，？ y '，' z '，？ A',? b '，？ c '，？ d '，？
e '，？ f '，？ g '，？ h '，？ Me',? j '，？ k '，？ l '，' M '，？ n '，？ Oh,,?
p '，？ q '，？ r '，？ s '，？ t '，？ u '，？ v '，？ w '，？ x '，？ y '，' Z '，？
'0′,? ' 1′,? '2′,? ' 3′,? '4′,? ' 5′,? '6′,? ' 7′,? '8′,? ' 9′,? '! ' ,?
'@','#',? '$',? '%',? '^',? & amp',?' *',?' (',?' )',?' -',?' _',?
'[',? ' ]',? '{',? '}',? & lt',? & gt',? '~',? '`',? '+',? '=',? ',',?
'.',? '; ' ,? ':',? '/',? '? ' ,? '|'); ?
//? Are you online? $chars？ Help yourself? $ length? Key names of array elements?
$keys？ =? ($chars，？ $ length)； ?
$password？ =? "; ?
For ($ me? =? 0; ? $i？ & lt？ $ length; ? $i++)？
{?
//? Will. $ length? Array elements are concatenated into a string?
$password？ . =? $ chars[$ keys[$ I]]； ?
}?
Return? $ password？
}