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run code in 150+ php & hhvm versions
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<?php class ObjectMap { private $keyMap = []; private $valMap = []; private $keyVal = []; private $valKey = []; private function hash($object) { return spl_object_hash($object); } public function set($key, $val) { $this->keyMap[$keyHash = $this->hash($key)] = $key; $this->valMap[$valHash = $this->hash($val)] = $val; $this->keyVal[$keyHash] = $valHash; $this->valKey[$valHash] = $keyHash; } public function get($key) { if (isset($this->keyVal[$keyHash = $this->hash($key)], $this->valMap[$this->keyVal[$keyHash]])) { return $this->valMap[$this->keyVal[$keyHash]]; } return null; } public function getKey($val) { if (isset($this->valKey[$valHash = $this->hash($val)], $this->keyMap[$this->valKey[$valHash]])) { return $this->keyMap[$this->valKey[$valHash]]; } } } $objectMap = new ObjectMap(); $objectMap->set($a = (object) ['value' => 'a'], $b = (object) ['value' => 'b']); $objectMap->set($c = (object) ['value' => 'c'], $d = (object) ['value' => 'd']); $objectMap->set($e = (object) ['value' => 'e'], $f = (object) ['value' => 'f']); var_dump($objectMap->get($a)); var_dump($objectMap->get($c)); var_dump($objectMap->getKey($f));
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
object(stdClass)#3 (1) { ["value"]=> string(1) "b" } object(stdClass)#5 (1) { ["value"]=> string(1) "d" } object(stdClass)#6 (1) { ["value"]=> string(1) "e" }
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/46auN on line 6
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/46auN on line 6
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/46auN on line 6
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_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/46auN on line 6
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/46auN on line 6
Process exited with code 255.