Using php if statement to check input value is between 0 and 100

Problem 1: string

vsint

You are currently comparing strings, not numbers. Inject the variable $_POST

in int

and remove the apostrophes around 0

and 100

to fix this:

$rate = (int) $_POST['rate'];
if ($rate >= 0 || =< 100) { /* ... */ }

      

        
        
        
      

    

Problem 2: something is missing

However, this will still not give the results you want as you are missing enough $rate

for the second comparison. Change it to:

$rate = (int) $_POST['rate'];
if ($rate >= 0 || $rate =< 100) { /* ... */ }

      

        
        
        
      

    

Problem 3: or

vsand

And we're still not there. You are currently using ||

(or) . Instead, you need to use &&

(and) :

$rate = (int) $_POST['rate'];
if ($rate >= 0 && $rate =< 100) { /* ... */ }

      

        
        
        
      

    

Problem 4: =<

vs<=

Still won't work. One of your comparison operators is in the wrong way. =<

should be <=

instead of:

$rate = (int) $_POST['rate'];
if ($rate >= 0 && $rate <= 100) { /* ... */ }

      

        
        
        
      

    

Problem 5: user input

$_POST

contains data coming from the user. Never trust user data. For example, what if there is no item rate

? In this case PHP throws a type error E_NOTICE

(which you don't even see if you don't have a set of reports before E_ALL

) and after converting to int

, appreciate it 0

! Hence, your test will pass, which is probably not what you want. To prevent this, use isset()

:

$rate = isset($_POST['rate']) ? (int) $_POST['rate'] : -1;
if ($rate >= 0 && $rate <= 100) { /* ... */ }

      

        
        
        
      

    

Problem 6: something esle

As pointed out by Pedro Lobito , you also managed to enter a typo: esle

should be else

.

Problem 7: semicolon

As pointed out by Gert your line is $rate = $_POST['rate']

missing ;

at the end.

Summary

I don't mean to be rude, but seeing how many bugs you've managed to compress into this simple one if

, I feel like you should probably consult some basic PHP tutorials instead of Stack Overflow at this point.