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run code in 150+ php & hhvm versions
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<?php class ArrayAccessable implements ArrayAccess { protected $_container = array(); public function __construct($array = null) { if (!is_null($array)) { $this->_container = $array; } } public function offsetExists($offset) { return isset($this->_container[$offset]); } public function offsetGet($offset) { return $this->offsetExists($offset) ? $this->_container[$offset] : null; } public function offsetSet($offset, $value) { if (is_null($offset)) { $this->_container[] = $value; } else { $this->_container[$offset] = $value; } } public function offsetUnset($offset) { unset($this->_container[$offset]); } } $array = new ArrayAccessable(array('a', 'b', 'c', 'd', 'e' => 'assoc')); var_dump($array); unset($array['e']); var_dump('unset: ', $array); $array['meta'] = 'additional element'; var_dump('set: ', $array); var_dump(count($array));
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
object(ArrayAccessable)#1 (1) { ["_container":protected]=> array(5) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" ["e"]=> string(5) "assoc" } } string(7) "unset: " object(ArrayAccessable)#1 (1) { ["_container":protected]=> array(4) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" } } string(5) "set: " object(ArrayAccessable)#1 (1) { ["_container":protected]=> array(5) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" ["meta"]=> string(18) "additional element" } } int(1)
Output for hhvm-3.10.0

Process exited with code 137.
Output for 5.0.0 - 5.2.17
object(ArrayAccessable)#1 (1) { ["_container:protected"]=> array(5) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" ["e"]=> string(5) "assoc" } } string(7) "unset: " object(ArrayAccessable)#1 (1) { ["_container:protected"]=> array(4) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" } } string(5) "set: " object(ArrayAccessable)#1 (1) { ["_container:protected"]=> array(5) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" ["meta"]=> string(18) "additional element" } } int(1)
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting '{' in /in/tAHRR 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_STRING, expecting '{' in /in/tAHRR on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/tAHRR on line 4
Process exited with code 255.