PHP Authentication How to authenticate in PHP

if(!isset($PHP_AUTH_USER))
{
Header("WWW-Authenticate: Basic realm=Please enter your username and password:");
Header("HTTP/1.0 401 Unauthorized");
echo "Authentication failed, you cannot access network resources!";
exit;
}
else
{
if ($PHP_AUTH_USER!="username" or $PHP_AUTH_PW!="password")
{
Header("HTTP/1.0 401 Unauthorized");
echo "Verification failed, you cannot network resources!";
exit;
}
}
?>

The above introduces PHP identity authentication and how to perform identity authentication in PHP, including the content of PHP identity authentication. I hope it will be helpful to friends who are interested in PHP tutorials.