CODEWITHSUNDEEP
phptypesinteger
Oki Erie Rinaldi
Oki Erie Rinaldi

Reputation: 1863

Big number base conversion and maximum limit

I have this problem:

        // 7788778877887786660462040644602088666448 (10) = 9mwjmtyko1mpect1brz2exoncc (36)

    $a = 7788778877887786660462040644602088666450 - 2;
    echo $a."<br>"; // prints 7.7887788778878E+39
    $b = "9mwjmtyko1mpect1brz2exoncc";
    echo base_convert($b, 36, 10)."<br>"; //prints 7788778877887786660462040644602088666448

I know why $a was printed to 7.7887788778878E+39, it's because the value of $a is over the integer limit.
But, why it is not being 7.7887788778878E+39 when I convert 9mwjmtyko1mpect1brz2exoncc to decimal? It just prints the exact value (7788778877887786660462040644602088666448)
How can I print $a to the exact value (ignoring error)?
Is 7788778877887786660462040644602088666448 another data type that is bigger than long/unsigned-long?

Upvotes: 1

Views: 147

Answers (1)

The fourth bird
The fourth bird

Reputation: 163437

Looking at some of the answers on this page: How to keep long int during PHP string conversion? I don't think you can do that because the large values are being stored as a float.

Suggestions are to use a library like BC Math and GMP, but I think that those are not enabled in PHP by default.

Upvotes: 1

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