/*
Combine two 32-bit values into one 64-bit value.
- The high 32 bits are shifted left by 32 positions.
- The low 32 bits are OR'ed in.
PHP automatically promotes integers to 64-bit on 64-bit systems,
so this works exactly like uint64_t in C++.
*/
/*
Function that combines two 32-bit integers into a 64-bit integer
*/
function combine_two32bit(int $high, int $low): int {
// Cast 'high' to 64-bit before shifting to avoid overflow
$result = ((int)$high << 32) | $low;
return $result;
}
/*
Function that prints a 64-bit integer in hex with leading zeros
*/
function print_hex64(int $value): void {
// "%016X" prints 16 hex digits (64 bits) with leading zeros
printf("0x%016X\n", $value);
}
/*
Main program logic
*/
$high = 0x11223344; // Example high 32 bits
$low = 0x55667788; // Example low 32 bits
$combined = combine_two32bit($high, $low);
printf("High 32 bits: 0x%08X\n", $high);
printf("Low 32 bits: 0x%08X\n", $low);
echo "Combined 64-bit value: ";
print_hex64($combined);
/*
run:
High 32 bits: 0x11223344
Low 32 bits: 0x55667788
Combined 64-bit value: 0x1122334455667788
*/
