PHP_BCRYPT_PASSWORD_HASH.php

<?php
  function hash_password($password, $salt = false) {
    
    if(!$salt) {
     $gen_salt = generate_random_string();
     $hashed['salt'] = '$6$rounds=150000$' . $gen_salt . '$';

    } else {
      $hashed['salt'] = '$6$rounds=150000$' . $salt . '$';
    }
    
    $hashed['password'] = crypt($password, $hashed['salt']);

    return $hashed;
  
  }
  
  function generate_random_string($length = 16){
    $characterList = "abcdefghijklmnopqrstuvwxyzABCEDFGHIJKLMNOPQRSTUVWXYZ0123456789";
    $string = "";
    
    for ($i = 1; $i <= $length; $i++) {
      $string .= $characterList[mt_rand(0, strlen($characterList) - 1)];
    }
    
    return $string;
  }
?>