Question

If I have a string in php and I need to do something if the last digit equals 9 how can I do it? For example,

$cost = '23829';
TRUE

or

   $cost = '2382';
   FALSE

or

   $cost = '9';
   TRUE

or

 $cost = '9999998';
   FALSE

Basically if the last number is 9 times original number by 2, I tried the following methods but they do not work.

 $cost = strrev($cost);
   if ($cost[0] == 9) $cost = strrev($cost) * 2;

and

if (substr($cost, -1) === '9') .......

They do not work as expected.

Answer 1

Try either:

if (substr($cost, -1) == 9) .......

or:

if ( (int) substr($cost, -1) === 9) .......