Detailed explanation of the code for php to implement web security authentication

This article mainly introduces the relevant information of detailed examples of PHP web security authentication. Here are two implementation methods, one is based on the database and the other is not based on the database. I hope it can help everyone through instinct. If you need it, Friends can refer to the detailed explanation of

PHP web page security authentication examples

Not based on database:

##

<?php
    //unset($_SERVER[&#39;PHP_AUTH_USER&#39;]);
    $strAuthUser= $_SERVER[&#39;PHP_AUTH_USER&#39;];      
    $strAuthPass= $_SERVER[&#39;PHP_AUTH_PW&#39;];

 if (! ($strAuthUser == "a" && $strAuthPass == "a")) {
  header(&#39;WWW-Authenticate: Basic realm="wly"&#39;);
  header(&#39;HTTP/1.0 401 Unauthorized&#39;);
  echo "用户验证!!";
  exit;
 } else {
  echo "验证通过";
  
  header("location:http://www.baidu.com");
  //unset($_SERVER[&#39;PHP_AUTH_USER&#39;]);  
 }
?>

Based on database:

<?php
  function authenticate_user() {
    header(&#39;WWW-Authenticate: Basic realm="Secret Stash"&#39;);
   header("HTTP/1.0 401 Unauthorized");
    exit;
  }
 
  if (! isset($_SERVER[&#39;PHP_AUTH_USER&#39;])) {
    authenticate_user();
  } else {
    mysql_pconnect("localhost","authenticator","secret") or die("Can&#39;t connect to database server!");
    mysql_select_db("java2s") or die("Can&#39;t select authentication database!");
 
   $query = "SELECT username, pswd FROM user WHERE username=&#39;$_SERVER[PHP_AUTH_USER]&#39; AND pswd=MD5(&#39;$_SERVER[PHP_AUTH_PW]&#39;)";
 
    $result = mysql_query($query);
 
    // If nothing was found, reprompt the user for the login information.
    if (mysql_num_rows($result) == 0) {
     authenticate_user();
    }
  }
 ?>

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