<?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 = 0xFFFFFFFF00000000 | $result;
} else if ($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);
}
$longs = array_values(unpack('NN', substr($str, 0, 4), substr($str, 4, 4)));
$signBit = (bool) ($longs[0] & 0x80000000);
if (!is32Bit()) {
$result = ($longs[0] << 32) | $longs[1];
if ($signBit) {
$result = (($result & 0x7FFFFFFFFFFFFFFF) * 2) + ~$result + 1;
}
}
return $result;
}
var_dump(is32Bit(), unpack_int32("\x81\x00\x00\x80", INT_SIGNED | INT_LE));
- Output for 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
- Deprecated: Implicit conversion from float 1.8446744069414584E+19 to int loses precision in /in/WPS4F on line 30
bool(false)
int(-2147483519)
- Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.1, 5.0.3 - 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 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
- bool(false)
int(-2147483519)
- Output for 5.2.1 - 5.2.9
- bool(true)
int(-2147483519)
- Output for 5.0.2
- bool(false)
int(9223372036854775807)
preferences:
230.83 ms | 401 KiB | 354 Q