[PHP] Working with internal data formats
What technique can I use to take an 8-byte double precision value, as stored internally, and assign its value to a PHP float variable without having the bytes misinterpreted as a character string. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Working with internal data formats
John Gunther wrote: What technique can I use to take an 8-byte double precision value, as stored internally, and assign its value to a PHP float variable without having the bytes misinterpreted as a character string. Does it get misinterpreted, or do you just want to be sure? The documentation says - Some references to the type double may remain in the manual. Consider double the same as float; the two names exist only for historic reasons. Does this cover your case? Iv -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Working with internal data formats
Iv Ray wrote: John Gunther wrote: What technique can I use to take an 8-byte double precision value, as stored internally, and assign its value to a PHP float variable without having the bytes misinterpreted as a character string. Does it get misinterpreted, or do you just want to be sure? The documentation says - Some references to the type double may remain in the manual. Consider double the same as float; the two names exist only for historic reasons. Does this cover your case? Iv No. Example: I extract the 8 bytes 40 58 FF 5C 28 F5 C2 8F from an external file, which is the internal double precision float representation of the decimal value 99.99. Starting with that byte string, how can I create a PHP variable whose value is 99.99? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Working with internal data formats
On Thu, 2008-05-15 at 10:33 -0400, John Gunther wrote: Iv Ray wrote: John Gunther wrote: What technique can I use to take an 8-byte double precision value, as stored internally, and assign its value to a PHP float variable without having the bytes misinterpreted as a character string. Does it get misinterpreted, or do you just want to be sure? The documentation says - Some references to the type double may remain in the manual. Consider double the same as float; the two names exist only for historic reasons. Does this cover your case? Iv No. Example: I extract the 8 bytes 40 58 FF 5C 28 F5 C2 8F from an external file, which is the internal double precision float representation of the decimal value 99.99. Starting with that byte string, how can I create a PHP variable whose value is 99.99? http://www.php.net/manual/en/function.unpack.php Cheers, Rob. -- http://www.interjinn.com Application and Templating Framework for PHP -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Working with internal data formats
John Gunther wrote: Example: I extract the 8 bytes 40 58 FF 5C 28 F5 C2 8F from an external file You mean you extract 40 58 FF 5C 28 F5 C2 8F, so to speak, as a string, right? Sorry, for asking, but somehow I do not the case. -- -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Working with internal data formats
On 15/05/2008, John Gunther [EMAIL PROTECTED] wrote:
Iv Ray wrote:
John Gunther wrote:
What technique can I use to take an 8-byte double precision value, as
stored internally, and assign its value to a PHP float variable without
having the bytes misinterpreted as a character string.
Does it get misinterpreted, or do you just want to be sure?
The documentation says -
Some references to the type double may remain in the manual. Consider
double the same as float; the two names exist only for historic reasons.
Does this cover your case?
Iv
No.
Example: I extract the 8 bytes 40 58 FF 5C 28 F5 C2 8F from an external
file, which is the internal double precision float representation of the
decimal value 99.99. Starting with that byte string, how can I create a PHP
variable whose value is 99.99?
Reversing the order of bytes then using unpack('d') works for me.
?php
$bytes = pack('H*', '4058FF5C28F5C28F');
$output = unpack('d', strrev($bytes));
print array_shift($output) . \n;
// 99.99
?
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