<?php
const INT_SIGNED = 1;
const INT_LE = 2;
function byteswap($str) {
return str_reverse($str);
}
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 = current(unpack('N', $str));
$signBit = (bool) ($result & 0x80000000);
$isSigned = (bool) ($flags & INT_SIGNED);
$is32bit = PHP_INT_MAX < 0x80000000;
if ($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);
}
$is32bit = PHP_INT_MAX < 0x80000000;
if ($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 (PHP_INT_MAX > 0x7FFFFFFF) {
$result = ($longs[0] << 32) | $longs[1];
if ($signBit) {
$result = (($result & 0x7FFFFFFFFFFFFFFF) * 2) + ~$result + 1;
}
}
return $result;
}
var_dump(unpack_int32("\x81\x00\x00\x80", INT_SIGNED | INT_LE));
- Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
- Deprecated: Implicit conversion from float 1.8446744069414584E+19 to int loses precision in /in/Lh7v3 on line 28
int(-2147483519)
- Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
- int(-2147483519)
- Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
- Parse error: syntax error, unexpected T_CONST in /in/Lh7v3 on line 3
Process exited with code 255. - Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
- Parse error: parse error, unexpected T_CONST in /in/Lh7v3 on line 3
Process exited with code 255. - Output for 4.3.2 - 4.3.4
- Parse error: parse error in /in/Lh7v3 on line 3
Process exited with code 255.
preferences:
258.83 ms | 401 KiB | 354 Q