PHP Question
PHP substr of hex
Is it possible to get a subsection of a hex value? For example:
0x7dd becomes 0xdd
Or even to get a subsection of binary value. For example:
$hex = 0x7dd;
$bin = hex2bin($hex);
$ bin = substr($bin,4); //so it excludes the four most significant bits ie. the most significant hex digit
Does anybody know of a efficient way of oing this?
Answer Source
Please read on bitwise operators.
Applying & (bitwise and) on a mask, or >> (right-shift) could be what your looking for (without converting back and forth to string).
For example:
0x7dd & 0xff == 0xdd
where & 0xff essentially ignores everything except the last two hex digits