<?php
define('INT_SIGNED', 1);
define('INT_LE', 2);
function is32Bit() {
$test = unpack('N', "\xFF\xFF\xFF\xFF");
return current($test) === -1;
}
function unpack_int32($str, $flags = 0) {
$length = strlen($str);
if ($length < 4) {
return false;
} else if ($length > 4) {
$str = substr($str, 0, 4);
}
if ($flags & INT_LE) {
$str = strrev($str);
}
$result = unpack('N', $str);
$result = current($result);
$signBit = (bool) ($result & 0x80000000);
$isSigned = (bool) ($flags & INT_SIGNED);
$is32bit = is32Bit();
if ($signBit && $isSigned && !$is32bit) {
$result = (0x00000000FFFFFFFF << 32) | $result;
} else if ($signBit && !$isSigned && $is32bit) {
$result = (($result & 0x7FFFFFFF) * 2) + ~$result + 1;
}
return $result;
}
function unpack_int64($str, $flags = 0) {
$length = strlen($str);
if ($length < 8) {
return false;
} else if ($length > 8) {
$str = substr($str, 0, 8);
}
if ($flags & INT_LE) {
$str = strrev($str);
}
$longs = array_values(unpack('N*', $str));
var_dump($longs);
$signBit = (bool) ($longs[0] & 0x80000000);
$isSigned = (bool) ($flags & INT_SIGNED);
if (!is32Bit()) {
$result = ($longs[0] << 32) | $longs[1];
if ($signBit && !$isSigned) {
$result = (($result & 0x7FFFFFFFFFFFFFFF) * 2) + ~$result + 1;
}
} else {
$result = 0;
}
return $result;
}
var_dump(unpack_int64("\x80\x00\x00\x00\x00\x00\x00\x00"));
- Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
- array(2) {
[0]=>
int(2147483648)
[1]=>
int(0)
}
float(9.223372036854776E+18)
- Output for 4.3.6 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0, 5.2.10 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
- array(2) {
[0]=>
int(2147483648)
[1]=>
int(0)
}
float(9.2233720368548E+18)
- Output for 5.2.2 - 5.2.9
- array(2) {
[0]=>
int(-2147483648)
[1]=>
int(0)
}
int(0)
- Output for 5.2.1
- array(2) {
[0]=>
int(2147483648)
[1]=>
int(0)
}
int(0)
- Output for 4.3.0 - 4.3.5
- array(2) {
[0]=>
int(2147483648)
[1]=>
int(0)
}
int(-9223372036854775808)
preferences:
287.51 ms | 401 KiB | 456 Q