PHP getting random number experience _ PHP Tutorial

PHP experiences getting random numbers. Purpose: obtain random string parameters for PHP to obtain random numbers: 1, (int) $ length32 # random character length 2, (int) $ mode0 # random character type, 0 is a combination of uppercase and lowercase English letters and numbers.

Purpose:

Returns a random string.

Parameters for PHP to obtain a random number:

1. (int) $ length = 32 # random character length
2. (int) $ mode = 0 # random character type. 0 indicates uppercase and lowercase English letters and numbers, 1 indicates numbers, 2 indicates lowercase letters, 3 indicates uppercase letters, and 4 indicates uppercase and lowercase letters, 5 is an uppercase letter and number, and 6 is a lowercase letter and number.

PHP code for getting a random number definition

 
 

  
  
< ?php 
  
  
class getRandstrClass 
  
  
{ 
  
  
function getCode ($length = 32, $mode = 0) 
  
  
{ 
  
  
switch ($mode) { 
  
  
case '1': 
  
  
$str = '1234567890'; 
  
  
break; 
  
  
case '2': 
  
  
$str = 'abcdefghijklmnopqrstuvwxyz'; 
  
  
break; 
  
  
case '3': 
  
  
$str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; 
  
  
break; 
  
  
case '4': 
  
  
$str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZa
bcdefghijklmnopqrstuvwxyz';break; 
  
  
case '5': 
  
  
$str = 'ABCDEFGHIJKLMNOPQRSTUVWXY
Z1234567890'; 
  
  
break; 
  
  
case '6': 
  
  
$str = 'abcdefghijklmnopqrstuvwxyz
1234567890'; 
  
  
break; 
  
  
default: 
  
  
$str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZa
bcdefghijklmnopqrstuvwxyz1234567890'; 
  
  
break; 
  
  
} 
  
  
$randString = ''; 
  
  
$len = strlen($str)-1; 
  
  
for($i = 0;$i < $length;$i ++){ 
  
  
$num = mt_rand(0, $len); 
  
  
$randString .= $str[$num]; 
  
  
} 
  
  
return $randString ; 
  
  
} 
  
  
} 
  
  
?> 
 
 

Instructions for using PHP to obtain random numbers:

1. Save the above code as random. php
2. introduce random. php on the required page

 
 

  
  
< ?php 
  
  
require_once('random.php'); 
  
  
?> 
 
 

3. use the previously defined class

 
 

  
  
< ?php 
  
  
$code = new getRandstrClass(); 
  
  
$length = 32; 
  
  
$mode = 0; 
  
  
$str = $code->getCode($length, $mode); 
  
  
echo $str; 
  
  
?> 
 
 

The above is all the application methods for PHP to obtain random numbers.

Parameters used to obtain a random number from a random string in PHP: 1, (int) $ length = 32 # random character length 2, (int) $ mode = 0 # random character type, 0 is a combination of uppercase and lowercase English letters and numbers...