PHP生成随机码的思路与方法实例探索

function get_rand_ascii($pw_length = 5){
  $randpwd = '';
  for ($i = 0; $i < $pw_length; $i++) {
    $randpwd .= chr(mt_rand(33, 99));
  }
  return $randpwd;
}

function getRandomString($length=5) {
  //可任意添加需要的字符
  $chars = array(
    "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", "0", "1", "2",
    "3", "4", "5", "6", "7", "8", "9"
  );
  $charsLen = count ( $chars ) - 1;
  shuffle ( $chars ); // 将数组打乱
  $output = "";
  for($i = 0; $i < $length; $i ++) {
    $output .= $chars [mt_rand ( 0, $charsLen )];
  }
  return $output;
}

function get_pass( $length = 8 ) {
  // 密码字符集，可任意添加你需要的字符
  $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-_ []{}<>~`+=,.;:/?|';
  $password = '';
  for ( $i = 0; $i < $length; $i++ ) {
    // 这里提供两种字符获取方式
    // 第一种是使用 substr 截取$chars中的任意一位字符；
    // 第二种是取字符数组 $chars 的任意元素
    // $password .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    $password .= $chars[ mt_rand(0, strlen($chars) - 1) ];
  }
  return $password;
}

public function getRand(){
  $rand = rand(10000,100000);
  $str = substr(base64_encode($rand), 0, 5);
  return $str;
}

$password = 'password1232456';//前端 获取的原始密码
//数据库存放的 使用BCRYPT算法加密的密码
//此处仅为测试，实际应用时应从数据表中查询获得
//$db_pass = '$2y$10$2vJJC.rb/swAUnTfc9B94.l/ix75kiZHvOZFpu0Dd8uzp07YWlj4q';
$db_pass = password_hash($password, PASSWORD_BCRYPT);
if (password_verify($password , $db_pass)){
  echo "密码匹配";
}else{
  echo "密码错误";
}