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run code in 150+ php & hhvm versions
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<?php abstract class Super { private $aliases; protected function __construct(array $aliases) { $this->aliases = $aliases; } public function __call($name, $arguments) { /* if $name is an alias, replace it */ if (isset($this->aliases[$name])) { $name = $this->aliases[$name]; } /* throw an exception if the method is undefined */ if (!method_exists($this, $name)) { throw new Exception("The specified method or method alias is undefined in the current context"); } /* finally, call the method by its actual name */ return $this->$name($arguments); } } class Sub extends Super { public function __construct() { parent::__construct(array( "alias" => "actualMethod" )); } public function actualMethod() { echo "Inside the actual method"; } } $sub = new Sub; $sub->actualMethod(); $sub->alias();
Output for 5.1.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Inside the actual methodInside the actual method
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/U5RTa on line 7
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CLASS in /in/U5RTa on line 3
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_CLASS in /in/U5RTa on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/U5RTa on line 3
Process exited with code 255.