PHP database query and password matching function

This article mainly introduces PHP database query and password matching function, interested in the friend's reference, I hope to help you.

This paper introduces a simple test landing class for PHP implementation, as follows:

<?phpclass checklogin{  var $name;  var $pwd;  function __construct ($username, $password)  {   $this->name= $username;   $this->pwd= $password;  }  function Checkinput ()  {   global $db;   $sql = "SELECT * from Tb_manager where name= ' $this->name ' and pwd= ' $this->pwd '";   $res = $db->query ($sql);   $info = $db->fetch_array ($res);    if ($info [' name ']== $this->name and $info [' pwd ']== $this->pwd)   {     $_session[admin_name]= $info [name];     $_session[pwd]= $info [pwd];     echo "<script>alert (' Login successful! ); window.location.href= ' index.php ';</script> ";   }   else   {     echo "<script language= ' JavaScript ' >alert (' Login failed! '); History.back ();</script> ";     Exit;}}}  ? >

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