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@ 2013-03-22T12:14:28Z

<?php

    const INT_SIGNED = 1;
    const INT_LE = 2;

    function unpack_int32($str, $flags = 0) {
        $length = strlen($str);
        if ($length < 4) {
            return false;
        } else if ($length > 4) {
            $str = substr($str, 0, 4);
        }

        $format = ($flags & INT_LE) ? 'V' : 'N';
        $result = current(unpack($format, $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;
    }

    var_dump(unpack_int32("\x81\x00\x00\x00"));

Output for git.master, git.master_jit, rfc.property-hooks: int(2164260864)

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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