How to get a four-digit random number of letters and numbers in PHP, four-digit random number_PHP tutorial

How to obtain four-digit random number of letters and numbers in php, four-digit random number

So we know that simple four-digit pure number verification in php can be done with rand(1000,9999), but if we want to get random four-digit numbers of letters and numbers, then how should we write a function Woolen cloth? Hu Peng's blog below gives a complete example under the PHP information column.

<&#63;php
function GetfourStr($len) 
{ 
  $chars_array = array( 
    "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
    "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", 
    "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", 
    "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", 
    "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", 
    "S", "T", "U", "V", "W", "X", "Y", "Z", 
  ); 
  $charsLen = count($chars_array) - 1; 
 
  $outputstr = ""; 
  for ($i=0; $i<$len; $i++) 
  { 
    $outputstr .= $chars_array[mt_rand(0, $charsLen)]; 
  } 
  return $outputstr; 
} 
echo GetfourStr(4);
&#63;>

Part of the function analysis: mt_rand function description: mt_rand() returns a random integer.
If the optional min and max arguments are not provided, mt_rand() returns a pseudorandom number between 0 and RAND_MAX. For example, if you want a random number between 0 and 46 (inclusive), use mt_rand(0, 46).

http://www.bkjia.com/PHPjc/940489.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/940489.htmlTechArticlephp implementation method of obtaining four-digit random numbers of letters and numbers, four-digit random numbers then we know in php For simple four-digit pure numerical verification, rand(1000,9999) can be used, but if...