is_float(integer) == true

[SailorMax]

Description

The following code:

<?php
var_dump( is_float(12300000000000000000) );

Resulted in this output:

bool(true)

But I expected this output instead:

bool(false)

PHP Version

PHP 8.3.3

Operating System

Debian 11

[nielsdos]

That's because it's not an integer, but a float: https://3v4l.org/Ynacn When you type a number literal so large it can't fit in an integer, you get a float literal instead of an int literal.

[SailorMax]

I understand the reason, but this is bad solution with unexpected results. If we will try to write some kind of specific encoder (messagepack for example) we will get broken result.

[nielsdos]

The automatic change from integer to float happens in many cases, e.g. also when doing some arithmetic e.g. PHP_INT_MAX+1. If you want to change such a fundamental behaviour you'll have to contact the mailing list and do an RFC.