Convert a hexadecimal value to a decimal integer.

How do I convert hexadecimal to a 10-digit integer dual-byte hexadecimal to a decimal form?
For example: 0 xFFFFFFBF;
The hexdec function is converted to 4 bytes.

Reply to discussion (solution)

$ S = 0 xFFFFFFBF; echo $ s; // 4294967231 $ s = 'ffffffbf'; echo hexdec ($ s); // 4294967231

I don't know what you want to do?
In your example, the data is 4 bytes.

Or does this mean?

$ N = 0 xFFFFFFBF; $ s = pack ('L', $ n); echo bin2hex ($ s), PHP_EOL; print_r (unpack ('n *', $ s ));

Bfffffff
Array
(
[1] => 49151.
[2] => 65535.
)

This value should be converted to-65, and the weak php type will be automatically processed as a long integer.

$ N = 0 xFFFFFFBF; $ s = pack ('L', $ n); print_r (unpack ('L', $ s ));

Array
(
[1] =>-65
)