| Re: signed int64 pack/unpack [message #184583 is a reply to message #184579] |
Sun, 12 January 2014 03:01   |
Jerry Stuckle
Messages: 2598
Registered: September 2010
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Senior Member |
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On 1/11/2014 9:42 PM, Ben Bacarisse wrote:
> cameron7(at)gmail(dot)com writes:
>
>> I'm having a bit of trouble figuring out a straightforward way to
>> "pack" / "unpack" a signed int64.
>>
>> I'm on a 64-bit machine, but the 'i' and 'I' are coming back with
>> 4-byte length.
>
> There is no explicit format for 64-bit ints. The i/I formats are used
> for a native "int" but that need not be 64 bits on a 64-bit machine.
> The function is borrowed from Perl whose documentation says a bit more
>
> This 'integer' is _at_least_ 32 bits wide. Its exact size depends on
> what a local C compiler calls 'int'.
>
> On my 64-bit Linux machine, 'int' is 32 bits.
>
On my 64 bit Linux system, 'int' is 64 bits. But then I have the 64 bit
PHP version (and 64 bit OS) loaded.
What do you get when you do:
<?php
echo PHP_INT_MAX . "\n";
?>
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Jerry Stuckle
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