Program to generate random string in PHP

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Given a size N and the task is to generate a random string of size N.

Examples:

Input: 5
Output: eR3Ds

Input: 10
Output: MPRCyBgdcn

Method: Create a domain string which contains small letters, capital letters and the digits (0 to 9). Then generate a random number and pick the character present at that random index and append that character into the answer string.

Below is the program to generate random string using above method:

<?php 
  
// PHP function to print a  
// random string of length n 
function RandomStringGenerator($n) 
{ 
    // Variable which store final string 
    $generated_string = ""; 
      
    // Create a string with the help of  
    // small letters, capital letters and 
    // digits. 
    $domain = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"; 
      
    // Find the length of created string 
    $len = strlen($domain); 
      
    // Loop to create random string 
    for ($i = 0; $i < $n; $i++) 
    { 
        // Generate a random index to pick 
        // characters 
        $index = rand(0, $len - 1); 
          
        // Concatenating the character  
        // in resultant string 
        $generated_string = $generated_string . $domain[$index]; 
    } 
      
    // Return the random generated string 
    return $generated_string; 
} 
  
// Driver code to test above function 
$n = 5; 
echo "Random String of length " . $n 
   . " = " . RandomStringGenerator($n); 
?> 