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@ 2015-04-24T19:46:15Z

<?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 5.4.0 - 5.4.40, 5.5.24, 5.6.8: Parse error: syntax error, unexpected end of file in /in/UsCU1 on line 53
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected $end in /in/UsCU1 on line 53
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected $ in /in/UsCU1 on line 53
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/UsCU1 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/UsCU1 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/UsCU1 on line 4
Process exited with code 255.

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