3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?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));
based on 0avnY
Output for 5.1.2 - 7.2.0
int(0) int(1) int(1) int(7) int(61) int(0) int(35) int(59)
Output for 5.0.0 - 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 - 4.4.1
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.