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<?php class Context { private $context = null; private $data = []; public function __construct(Context $context = null) { $this->context = $context; } public function get($name) { if (isset($this->data[$name])) { return $this->data[$name]; } if (isset($this->context)) { return $this->context->get($name); } return null; } public function set($name, $value) { $this->data[$name] = $value; } public function wrap() { return new Context($this); } public function call(callable $function) { call_user_func($function, $this); } } (new Context)->call(function(Context $c) { $c->set('foo', 1); $c->set('bar', 2); $c->wrap()->call(function(Context $c) { $c->set('bar', 3); $c->set('qux', 4); $c->wrap()->call(function(Context $c) { $c->set('qux', 5); $c->set('zip', 6); var_dump($c); }); var_dump($c); }); var_dump($c); });
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
object(Context)#5 (2) { ["context":"Context":private]=> object(Context)#3 (2) { ["context":"Context":private]=> object(Context)#1 (2) { ["context":"Context":private]=> NULL ["data":"Context":private]=> array(2) { ["foo"]=> int(1) ["bar"]=> int(2) } } ["data":"Context":private]=> array(2) { ["bar"]=> int(3) ["qux"]=> int(4) } } ["data":"Context":private]=> array(2) { ["qux"]=> int(5) ["zip"]=> int(6) } } object(Context)#3 (2) { ["context":"Context":private]=> object(Context)#1 (2) { ["context":"Context":private]=> NULL ["data":"Context":private]=> array(2) { ["foo"]=> int(1) ["bar"]=> int(2) } } ["data":"Context":private]=> array(2) { ["bar"]=> int(3) ["qux"]=> int(4) } } object(Context)#1 (2) { ["context":"Context":private]=> NULL ["data":"Context":private]=> array(2) { ["foo"]=> int(1) ["bar"]=> int(2) } }
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/nGrLD on line 6
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/nGrLD 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/nGrLD on line 5
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/nGrLD on line 5
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/nGrLD on line 5
Process exited with code 255.
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