PHP是连接而不是添加

Question

I'm having this problem where my PHP code is concatenating instead of adding

$offset=$_POST['offset']; //Get the offset
$searchLimit = 10;
$searchCount = count(sql) //For the purpose of this question, it returns the result count

Now I want to calculate the 'from' display for pagination, so I do

$from = ($offset*$searchLimit)+1;

It works fine when

$offset == 0

I get the expected result which is 1. But when

$offset == 1

It gives me 101. Basically it is concatenating the 10 and 1 to give me 101. I've tried the following

$from = (int)($offset*$searchLimit)+1
$from = ((int)($offset)*$searchLimit)+1
$from = (((int)($offset)*$searchLimit)+1)

I even tried

$offset = (int)$_POST['offset'];

But all of them are giving the same result.

Answer 1

You are missing a $ before searchLimit. As a result, it is being treated as a string. This result in unexpected behaviour.