Online PHP editor | output for 46auN

@ 2014-10-27T15:38:56Z

<?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 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3: 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 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 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 - 4.3.11, 4.4.0 - 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.

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