PHP arithmetic operation outputs strange result (array-related)

Question

I have two variables which is as follows:

$ccharge = ($user_info[0]['charge']) - ($get_exam[0]['price']);

But it results -150000.

Both numbers are 150000 which should result 0, but it doesn't. Is this a familiar issue?

I have found the issue which is related to arrays. I have assigned them to simple variables and it has worked. But I want to know for my future projects.

why such formula causes problems?

Use var_dump on each value and it should be clear as to what's wrong. — John V.
– John V., Commented Nov 9, 2013 at 12:59

Developerium · Accepted Answer · 2013-11-09 12:58:09Z

1

try this

 $ccharge = ((float)$user_info[0]['charge']) - ((float)$get_exam[0]['price']);

answered Nov 9, 2013 at 12:58

Developerium

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3 Comments

Amal Over a year ago

This doesn't explain why the unexpected result occurs.

Developerium Over a year ago

this will cast it to float no matter string or int.

John V. Over a year ago

Why would you want it casted to float?

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