Online PHP editor | rfc for BMcRN

@ 2015-04-24T19:46:30Z

<?php

class PseudoRandomSequence {
    const STATE_HASH = "sha512";
    // 1/2 STATE_HASH block size,
    const STATE_SIZE = 32;
    private $state;
    public function __construct($state) {
        $this->state = $state;
        $this->mixState();
    }
    
    public function int($min = 0, $max = PHP_INT_MAX) {
        $range = $max - $min;
        if ($range <= 0 || is_float($range)) {
            throw new Exception("Invalid min/max provided");
        }
        $bits = 1;
        $tmp = $range;
        while ($tmp >>= 1) {
            $bits++;
        }
        $bytes = (int) max(ceil($bits / 8), 1);
        $mask = (int) (pow(2, $bits) - 1);
        if ($mask < 0) {
            // Hack since PHP will upcast 2^63-1 into a negative number
            $mask = PHP_INT_MAX;
        }
        do {
            $rand = hexdec(bin2hex(substr($this->bytes(8), 0, $bytes)));
            $result = $rand & $mask;
        } while ($result > $range);
        return $result + $min;
    }
    
    public function bytes($n) {
        $ret = '';
        do {
            $ret .= $this->mixState();
        } while (strlen($ret) < $n);
        return substr($ret, 0, $n);
    }
    
    private function mixState() {
        $hash = hash(self::STATE_HASH, $this->state, true);
        $this->state = substr($hash, 0, self::STATE_SIZE);
        echo('state changed');
        return substr($hash, self::STATE_SIZE);
    }
}

$prng = new PseudoRandomSequence("test");
$prng->int(0,99);

Output for git.master, git.master_jit, rfc.property-hooks: state changedstate changed

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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