CODEWITHSUNDEEP
phpnumber-formatting
odran037
odran037

Reputation: 271

PHP number_format displaying incorrectly

New to programming and taking a PHP course. I wrote a very small program to test out the number_format function. Here is my code:

$num = 9876543210123456789; 
$result = number_format($num);
echo = $result;

The output is: 9,876,543,210,123,456,512

I'm sure it has something to do with the length of $num. But haven't been able to find the exact explanation/reason why this happens.

Upvotes: 0

Views: 1486

Answers (2)

Nimeshka Srimal
Nimeshka Srimal

Reputation: 8950

You can't pass large numbers to the number_format() function. If you just need to format the number, you can write your own function to separate the numbers with a comma taking 3 by 3.

Reason is that if you check the manual, the number format takes the first parameter as a float. You need to have a good understanding about float, and ints to understand why it happens.

Here is something interesting I found in SO, it is same as your question, and it has a good answer. Please check it.

Why is my number value changing using number_format()?

Upvotes: 1

Hanky Panky
Hanky Panky

Reputation: 46900

You're seeig a different number because the number you have provided is large enough to cause an overflow on your system. Try with a smaller number

<?php
$num = 9876543210123; 
$result = number_format($num);
echo  $result;                    // will show as expected, with formatting

Even if you don't use number_format on that number, your number will still cause overflow. Try this

$num = 9876543210123456789; 
echo  $num;   // not what you see above

Also see:

What's the maximum size for an int in PHP?

PHP Integers and Overflow

Upvotes: 2

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