Checking if a value is not in an array and deleting record from database

[richclever]

Hi all,

 

I have been trying to figure this one out and have come up against a brick wall although I know it should be relatively simple.

 

I have a form that passes an array to a php script from a multiple select box that is created dynamically.  If a user deselects an item then I want to delete the record from the database but am having a big problem with it.

 

The table in the dbase is quite simple with just three fields:

 

id

classid

formid

 

Basically, the form send through a classid and a formid value and I want to delete any records that have a classid that are not in the form array and have a formid which is passed as a hidden value.

 

I suppose really what I want is to know how to see if a classid is not in the array that is passed.

 

Hope that makes sense.  Sorry I don't have any code but I can't get it even nearly right so what I have been playing with wouldn't be any use.

 

Thanks,

 

Richard

[Fadion]

I hope i got the concept right. Also i didnt try the code because i didnt have the database but i hope it gives the idea

 

$values = $_POST['select']; //get the array from the multiple select
$results = @mysql_query("SELECT * FROM table") or die();
while($rows = mysql_fetch_array($results){
for($i=0; $i<count($values); $i++){ //a loop to get all the array values
	if($rows['id'] == $values[$i]){ //if the curret id is finded in the array then exit and do nothing
		$deleteRow = false;
		exit;
	} else{                         //if it is not finded then it will delete
		$deleteRow = true;
	}
}
if($deleteRow == true){
	$queryDelete = "DELETE FROM table WHERE id='{$rows['id']}'";
}
}

[yarnold]

Couldn't you just use in_array()?

[Barand]

Rather than the "Hands up anyone who's not here" approach, it's easier if the user selects items to be deleted.

[Fadion]

Couldn't you just use in_array()?

 

Didnt know that. It shortens the code a lot