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run code in 150+ php & hhvm versions
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<?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)); $signBit = (bool) ($longs[0] & 0x80000000); $isSigned = (bool) ($flags & INT_SIGNED); if (is32Bit()) { if ($longs[1] & 0x80000000) { $longs[1] = (($longs[1] & 0x7FFFFFFF) * 2) + ~$longs[1] + 1; } if ($isSigned && $signBit) { $result = ($longs[0] * pow(2, 32)) + $longs[1]; } else { if ($signBit) { $longs[0] = (($longs[0] & 0x7FFFFFFF) * 2) + ~$longs[0] + 1; } $result = ($longs[0] * pow(2, 32)) + $longs[1]; } } else { $result = ($longs[0] << 32) | $longs[1]; if ($signBit && !$isSigned) { $result = (($result & 0x7FFFFFFFFFFFFFFF) * 2) + ~$result + 1; } } return $result; } echo "int32:\n"; printf("%f\n", unpack_int32("\xFF\xFF\xFF\xFC")); printf("%f\n", unpack_int32("\xFF\xFF\xFF\xFC", INT_SIGNED)); printf("%f\n", unpack_int32("\xFF\xFF\xFF\xFC", INT_LE)); printf("%f\n", unpack_int32("\xFF\xFF\xFF\xFC", INT_LE | INT_SIGNED)); echo "\n"; echo "int64:\n"; printf("%f\n", unpack_int64("\xFF\xFF\xFF\xFC\x00\x00\x00\x00")); printf("%f\n", unpack_int64("\xFF\xFF\xFF\xFC\x00\x00\x00\x00", INT_SIGNED)); printf("%f\n", unpack_int64("\xFF\xFF\xFF\xFC\x00\x00\x00\x00", INT_LE)); printf("%f\n", unpack_int64("\xFF\xFF\xFF\xFC\x00\x00\x00\x00", INT_LE | INT_SIGNED));
Output for 5.2.1 - 7.1.0
int32: 4294967292.000000 -4.000000 4244635647.000000 -50331649.000000 int64: 18446744056529682432.000000 -17179869184.000000 4244635647.000000 4244635647.000000
Output for 4.3.0 - 5.2.0
int32: 4294967292.000000 -4.000000 4244635647.000000 -50331649.000000 int64: 18446744056529685000.000000 -17179869184.000000 4244635647.000000 4244635647.000000