Write x number of random email addresses to file

generate_emails.php

<?php
  // This script generates x number of random email addresses
  // and outputs them to a CSV file.
  // Modified version of http://www.laughing-buddha.net/php/email

  // Number of emails you'd like to generate
  $count = 13575;

  // Open the file we're outputing to. (This file should exist before you run the script.)
  $fp = fopen('emails.csv', 'w');  

  // Array of possible domains
  $tlds = array("com", "net", "gov", "org", "edu", "biz", "info");

  // String of possible characters
  $char = "0123456789abcdefghijklmnopqrstuvwxyz";

  // main loop
  for ($j = 0; $j < $count; $j++) {

    // choose random lengths for the username ($ulen) and the domain ($dlen)
    $ulen = mt_rand(5, 10);
    $dlen = mt_rand(7, 17);

    // reset the address
    $a = "";

    // get $ulen random entries from the list of possible characters
    // these make up the username (to the left of the @)
    for ($i = 1; $i <= $ulen; $i++) {
      $a .= substr($char, mt_rand(0, strlen($char)), 1);
    }

    $a .= "@";

    // now get $dlen entries from the list of possible characters
    // this is the domain name (to the right of the @, excluding the tld)
    for ($i = 1; $i <= $dlen; $i++) {
      $a .= substr($char, mt_rand(0, strlen($char)), 1);
    }

    // need a dot to separate the domain from the tld
    $a .= ".";

    // finally, pick a random domain and stick it on the end
    $a .= $tlds[mt_rand(0, (sizeof($tlds)-1))];

    //echo $a."\n";
    
    $a = $a."\n";
    
    // Write to file
    fwrite($fp,$a);
  } 
  
  // Close the file
  fclose($fp);
?>