Detect CPU Endian-ness

Date : July 2, 2004

To detect a CPU’s endian architecture, use either one of the variables set like so:

$is_big_endian = unpack("h*", pack("s", 1)) =~ /01/;
$is_little_endian = unpack("h*", pack("s", 1)) =~ /^1/;

Found in Perlmonks