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@ 2015-04-24T18:31:13Z

<?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 = 0;
        $tmp = $range;
        while ($tmp >>= 1) {
            $bits++;
        }
        $bytes = (int) max(ceil($bits / 8), 1);
        $mask = pow(2, $bits) - 1;
        do {
            $rand = $this->bytes(8);
            $result = hexdec(bin2hex($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);
        return substr($hash, self::STATE_SIZE);
    }
}

$prng = new PseudoRandomSequence("test");
var_dump($prng->int(0, 10));
var_dump($prng->int(0, 10));
var_dump($prng->int(0, 10));
var_dump($prng->int(0, 10));
$prng = new PseudoRandomSequence("other");
var_dump($prng->int(0, 100));
var_dump($prng->int(0, 100));
var_dump($prng->int(0, 100));
var_dump($prng->int(0, 100));

Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: int(0) int(1) int(1) int(7) int(61) Deprecated: Implicit conversion from float 1.6246630863993975E+19 to int loses precision in /in/945l6 on line 27 int(0) int(35) int(59)
Output for 5.1.2 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30: int(0) int(1) int(1) int(7) int(61) int(0) int(35) int(59)
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.1: Fatal error: Call to undefined function hash() in /in/945l6 on line 41
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_CONST, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/945l6 on line 4
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: Parse error: parse error, unexpected T_CONST, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/945l6 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/945l6 on line 4
Process exited with code 255.

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