Prevent external post submission_PHP tutorial

Research on preventing external post submission

I studied the old topic again today:

At present, I think there is only one effective method, picture verification code.

Several other methods that don’t work:
1. Determine HTTP_REFERER. In fact, this information is sent by the browser to the server, so it can be simulated
2. Judge the session code as follows:
session_start();
if(isset($_POST['name']) && !empty($_POST['name'])){
if($_POST['check']==$_SESSION['check']){
echo 'Normal access';
}
else{
echo 'External access';

}
}
$token=md5(uniqid(rand(),true));
$_SESSION['check']=$token;

?>

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