Online PHP editor | rfc for 8HZka

@ 2016-10-28T10:27:03Z

<?php

/**
     * @return array
     */
    function crc64Table()
    {
        $crc64tab = [];

        // ECMA polynomial
        $poly64rev = (0xC96C5795 << 32) | 0xD7870F42;

        echo sprintf("%x", $poly64rev) . PHP_EOL;

        // ISO polynomial
        // $poly64rev = (0xD8 << 56);

        for ($i = 0; $i < 256; $i++)
        {
            for ($part = $i, $bit = 0; $bit < 8; $bit++) {
                if ($part & 1) {
                    $part = ($part >> 1) ^ $poly64rev;
                } else {
                    $part = ($part >> 1) ;
                }
            }

            $crc64tab[$i] = $part;
        }

        return $crc64tab;
    }

    /**
     * @param string $string
     * @param string $format
     * @return mixed
     *
     * Formats:
     *  crc64('php'); // afe4e823e7cef190
     *  crc64('php', '0x%x'); // 0xafe4e823e7cef190
     *  crc64('php', '0x%X'); // 0xAFE4E823E7CEF190
     *  crc64('php', '%d'); // -5772233581471534704 signed int
     *  crc64('php', '%u'); // 12674510492238016912 unsigned int
     */
    function crc64($string, $format = '%x')
    {
        static $crc64tab;

        if ($crc64tab === null) {
            $crc64tab = crc64Table();
        }

        $crc = 0;

        for ($i = 0; $i < strlen($string); $i++) {
            $crc = $crc64tab[($crc ^ ord($string[$i])) & 0xff] ^ (($crc >> 8) & ~(0xff << 56));
        }

        return sprintf($format, $crc);
    }
    
    echo crc64("123456", "%d");

Output for git.master, git.master_jit, rfc.property-hooks: c96c5795d7870f42 -1591452862231011344

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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