如何在php脚本后创建用户？

Question

What i am trying to do is to add a user following system (twitter like) to my script.

This is how the db structure looks like:

CREATE TABLE IF NOT EXISTS `user_follow` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `follower` int(11) NOT NULL,
  `following` int(11) NOT NULL,
  `subscribed` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `follow_unique` (`follower`,`following`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 ;

If i want create i should use this code:

mysql_query(" INSERT INTO `user_follow` (`follower`, `following`, `subscribed`) VALUES ('$follower', '$following', CURRENT_TIMESTAMP); ");

For the unsubscribe it should look like this:

mysql_query(" DELETE FROM `user_follow` WHERE `follower` = '$follower' AND `following` = '$following'; ");

.

$follower = $_SESSION[user_id]; // the user_id for the one who is currently logged id 
$following = $user_id; // the user_id for the user profile where the script will be on

On the profile page i have a form like this:

<?php if (isset($_SESSION[user_id]) && $_SESSION[user_id] != $user_id) { ?>
<form action="" method="post">
<input name="action" type="hidden" value="<?php echo $subscribe_status; ?>"/>
<button name="subject" type="submit" value="<?php echo $subscribe_text.' '.$username; ?>"><?php echo $subscribe_text.' '.$username; ?></button>
</form>
<?php } ?>

What i don't know is how to link all of those codes...

EDIT:

$subscribe_status should change to follow or unfollow depending if the user is already following that user or not (by checking with a query i think).

Also $subscribe_text should be Follow or Unfollow depending if the currently logged in user ( $follower ) is already following that user or not.

Can anybody help me please?

EDIT 2 (based on Mihir Singh's answer)

$user_follow = dbquery(" SELECT * FROM `user_follow` WHERE `follower` = '$follower' AND `following` = '$following'; ");
$check_status = dbrows($user_follow);

$sub = false; //Boolean var which states if subscribed or not

if ( $check_status !== 0 ){ //Pseudo code
    $sub = true; //If row is found, they are subscribed, so set $sub to true
}

if($sub){
     $subscribe_status = "follow";
     $subscribe_text = "Follow";
}

else{
     $subscribe_status = "unfollow";
     $subscribe_text = "Unfollow";
}

Answer 1

Here's some code:

$sub = false; //Boolean var which states if subscribed or not

if (row in table exists --> subscribed ){ //Pseudo code
    $sub = true; //If row is found, they are subscribed, so set $sub to true

if($sub){
     $subscribe_status = "Follow";
     $subscribe_text = "Unfollow";
}

else{
     $subscribe_status = "Unfollow";
     $subscribe_text = "Follow";
}

EDIT:

So, this is the form code that you're using:

<?php if (isset($_SESSION[user_id]) && $_SESSION[user_id] != $user_id) { ?>
<form action="" method="post">
<input name="action" type="hidden" value="<?php echo $subscribe_status; ?>"/>
<button name="subject" type="submit" value="<?php echo $subscribe_text.' '.$username; ?>">       
<?php echo $subscribe_text.' '.$username; ?></button>
</form>
<?php } ?>

Based on that, I would change

<form action="" method="post">

to

<form action="handler.php" method="post">

and then create a handler file with this:

<?
    if ($_POST['action'] == "Follow")
        //Perform Unfollow Query to Database
    else
        //Perform Follow Query to Database
?>

That's barebones.... but it should work out. How's that?