PHP generates random cipher functions (four sections)

Method One

The code is as follows

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function Generate_password ($length = 8) {    //password character set, you can add any character you need     $chars = ' Abcdefghij klmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&* ()-_ []{}<>~ ' +=,.;:/?| ';     $password = ';     for ($i = 0; $i < $length; $i + +)     {         //Here are two character capture methods        //The first is to use SUBSTR to intercept any one character in the $chars;        //The second is any element that takes a character array $chars         $password. = substr ($chars, Mt_rand (0, strlen ($chars)-1), 1);         $password. = $chars [Mt_rand (0, strlen ($chars)-1)];    }     return $password; }

Method Two

Generate 6 digit, letter mixed password

The code is as follows

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<?php $str = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; Output Character Set $n = 6; Output string length $len = strlen ($str)-1; for ($j =0; $j <200; $j + +) { for ($i =0; $i < $n; $i + +) { $s. = $str [rand (0, $len)]; } Echo $s. "<br/>"; $s = ""; } ?> Automatically generate passwords for numbers, letters, and symbols <?php $a = "12345678"; $b = "ABCDEFGHIJKLMNOPQISTUVWXYZ"; $s = substr (str_shuffle ($a), 0, 2); $e = substr (Str_shuffle ($b), 0, 2); Echo $s. substr (Str_shuffle ("!@#$%^&*"), 0, 2). $e; ?>

Method Three

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 the function, passing the length parameter $pw_length = 6 Echo Create_password (6);

Method Three

code is as follows

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<?php Function Getmicrotime () {     list ($usec, $sec) = Explode ("", Microtime ());     return ((float) $usec + (float) $sec); }   //Record start time $time _start = Getmicrotime ();     //Here is the PHP code to execute, such as: //EC Ho Create_password (6);   //Record end time $time _end = Getmicrotime (); $time = $time _end-$time _start;  //output Run total time echo "Execution time $time seconds"; ?