sessions

davis_s

hello everyone,

i'm new to php and i'm having hard time with sessions

i'm trying to create a php file with a drop down menu and when you select an item from the drop down menu, you could retreve it from another page.

for example:

a1.php

	<?php session_start();
	if(isset($_POST['color'])) 
	{ 
		$_SESSION['blue']='blue'; 
		$_SESSION['red']='red'; 
		$_SESSION['green']='green'; 
		$_SESSION['orange']='orange'; 
	} 
	?>
<html>
	<body>	
		<form id="shirt" method="post" action="a2.php">
			<p>
				<select name="Size">
					<option value="invalid">Select a size ...</option>
					<option value="blue">blue</option>
					<option value="red">red</option>
					<option value="green">green</option>
					<option value="orange">orange</option>
				</select>
				<br />
				<input type="Submit" value="Add" name="Add" />
			</p>
		</form>
	</body>
</html>

when the user chooses a color, it adds it to the session and then when the user clicks add, he is redirected to another page named a2.php which shows the color is added.

if the user goes back to the original page and adds the same color again it shows that he added the item again:

Color: ----------- Quantity:
Red ----------- 2

a2.php

<?php session_start();
	$item_id = $_GET[id];
	$action 	= $_GET[action];

switch($action)
{	

	case "add":
		$_SESSION['color'][$item_id]++;
	break;

	case "remove":
		$_SESSION['color'][$item_id]--; 

if($_SESSION['color'][$item_id] == 0) unset($_SESSION['color'][$item_id]);  
	break;

	case "empty":
		unset($_SESSION['color']);
	break;

}
?>

sorry if my question is not clear,

any help is appreciated

Thank You,

paulnaj

Hi there, welcome to the forum.

Before getting sessions up and running, you'll want to make sure your HTML code and logic is all in place. The form (I've just cut'n'pasted it) is not going to do what you want ...

<html>
	<body>	
		<form id="shirt" method="post" action="a2.php">
			<p>
				<select name="Size">
					<option value="invalid">Select a size ...</option>
					<option value="blue">blue</option>
					<option value="red">red</option>
					<option value="green">green</option>
					<option value="orange">orange</option>
				</select>
				<br />
				<input type="Submit" value="Add" name="Add" />
			</p>
		</form>
	</body>
</html>

... since the variable you are sending to a2.php is 'Size', not 'color'.

So, fix that by changing the select/name attribute to name="color".

a2.php is expecting '$GET' variables, but you are sending '$POST' variables to it (in the form you have method="post"), so decide which method to use and stay with that one.
Even if you fix [1] and [2], the variables a2.php are expecting are: 'id' and (confusingly) 'action', whereas the form is sending 'Add' and 'color'.

Are you trying to adapt some existing code?

davis_s

thank you for welcoming me and for replying

i'm using a previous form with sizes, i used the form with database, but now i just want to use it with sessions

so i add the user has a drop down list that asks him to choose a color, when he chooses one of the four colors and clicks add it takes him to a2.php and shows him that he has added the specific color and the quantity he added...

so if he presses back and adds the same color again it will show the color and the quantity as "2"

i'm sorry if my explanation is not clear....

i fixed the first part of the form...a1.php

<html>
<body>
<form id="color" method="post" action="a2.php">
<p>
<select name="color">
<option value="invalid">Select a size ...</option>
<option value="blue">blue</option>
<option value="red">red</option>
<option value="green">green</option>
<option value="orange">orange</option>
</select>
<br />
<input type="Submit" value="Add" name="Add" />
</p>
</form>
</body>
</html>

a2.php

<?php session_start();
$item_id = $POST[id];
$action = $PST[add];

switch($action)
{	

	case "add":
		$_SESSION['color'][$item_id]++;
	break;

	case "remove":
		$_SESSION['color'][$item_id]--; 

if($_SESSION['color'][$item_id] == 0) unset($_SESSION['color'][$item_id]);  
	break;

	case "empty":
		unset($_SESSION['color']);
	break;

}

i don't know if i got this right...

davis_s

a1.php

<html>
	<body>	
		<form id="color" method="post" action="a2.php">
			<p>
				<select name="color">
					<option value="invalid">Select a size ...</option>
					<option value="blue">blue</option>
					<option value="red">red</option>
					<option value="green">green</option>
					<option value="orange">orange</option>
				</select>
				<br />
				<input type="Submit" value="Add" name="Add" />
			</p>
		</form>
	</body>
</html>

a2.php

<?php session_start();
	$item_id = $_POST[id];
	$action 	= $_PST[add];

switch($action)
{	

	case "add":
		$_SESSION['color'][$item_id]++;
	break;

	case "remove":
		$_SESSION['color'][$item_id]--; 

if($_SESSION['color'][$item_id] == 0) unset($_SESSION['color'][$item_id]);  
	break;

	case "empty":
		unset($_SESSION['color']);
	break;

}
?>

i don't know if i got this right...