Attempt greater than PHP_INT_MAX

PHP
1

On a 64-bit server, I tried this:

$a= hexdec("FFFFFFFFFFFFFFFF");
print($a."<br>");
printf("%d", $a);

and here is the output:
1.84467440737E+19
0

I expected to get -1 as this would be greater than PHP_INT_MAX. why didn’t I get -1? and what does the number above mean? and how to get -1 for this?

2

means 1.84467440737 x 10^19 or 18 446 744 073 700 000 000

3

so what to do with it? do I have to run hexdec() to this to get the value you gave? why %i does not return 1 as it looks like a float?and shouldn’t it be -1 on a 64-bit server?

4

Can you print PHP_INT_MAX and tell us what you get?

5

on 64-bits, obviously I got: 9223372036854775807
and again to hex obviously I got: 7fffffffffffffff
so why with 16x F, I didn’t get -1? why 1.84467440737E+19 ? and what does it mean?

6

From the PHP.net manual page about the hexdec() function.

Note:
The function can convert numbers that are too large to fit into the platforms integer type, larger values are returned as float in that case.

Scott

7

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