You could check the endianness of the machine running the code and reverse the bytes manually as necessary. The code below should work, but you will only be able to convert one int or float at a time.
define('BIG_ENDIAN', pack('L', 1) === pack('N', 1));
function pack_int32s_be($n) {
if (BIG_ENDIAN) {
return pack('l', $n); // that's a lower case L
}
return strrev(pack('l', $n));
}
function pack_int32s_le($n) {
if (BIG_ENDIAN) {
return strrev(pack('l', $n));
}
return pack('l', $n); // that's a lower case L
}
function pack_double_be($n) {
if (BIG_ENDIAN) {
return pack('d', $n);
}
return strrev(pack('d', $n));
}
function pack_double_le($n) {
if (BIG_ENDIAN) {
return strrev(pack('d', $n));
}
return pack('d', $n);
}