跨多个表单文件的php计数器变量

Question

I have multiple pages. On each page I have a list of items. So on Page 1, I have Items 1-10. On page 2, I have items 11-20. It is NOT ten items per page but the point is that page 3 should start off with the number immediately following the last number on page 2.

The pages have a simple numeric variable so the counting of items works fine per page but I want it to be set in one place.

I am brand new to php so my question is mostly about how and where to store a variable that would keep track of this item count over multiple files?

Desired behavior:

Let's say Page 1 has 5 items and my counter variable on page 1 sets them to be correctly numbered to:

1.apple
2.grape
3.pear
4.banana
5.orange

But let's say I need to remove banana. When I do so, the current counter on page 1 works fine and sets to:

1.apple
2.grape
3.pear
4.orange

But on page 2 the counter variable is set to 6 and has:

6.mango
7.peach
8.watermelon

I want to set the persistent variable so that when I remove a fruit, it will update not only the current page the removed fruit is on but every page after that. So it would adjust page 2 to:

5.mango
6.peach
7.watermelon

Would sessions make that change permanent or would it disappear with the user's cookie?

Answer 1

<?php
//On the first line of your PHP code
session_start();

//then store your variable in the SESSION array.
$_SESSION['yourCountersNameHere'] = 56;

//You should now have acces to its value from page to page like this

echo $_SESSION['yourCountersNameHere'];
//Should display 56.
?>

you could also store it in a DB. and then check in the DB on every page.

//to connecte
$m_DB = new PDO("mysql:host=".$Host.";dbname=".$DBName."; charset=utf8", $Login, $Password);

//check value in DB
$query = "SELECT * FROM table";
$stmt = $m_DB->prepare($query);
//$param here is empty but normaly it would be a array for all your params like this:
//$param = array('rowname'=>$value, 'rowName2'=>$value2, .........and so on for all the $params you use.);

$getCounter = $stmt->execute($param);
while($Counter = $getCounter->fetch())
{
    //Display the value in your MySQLDB.
    echo $Counter['table.rowName'];
}

If you use another DB type than MYSQL the code should be fairly the same exepte for a couple of changes you'll have to make.