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<?php class test { private $data = array(); public function __get($key) { echo "get $key\n"; return $$key; } public function __set($key, $value) { echo "set $key = $value\n"; $this->$key = $value; } public function __isset($key) { echo sprintf("isset $key ( returns %b )", isset($this->$key)); return isset($this->$key); } } $test = new test(); var_dump(property_exists($test, 'x')); var_dump(isset($test->x)); $test->x = 42; var_dump(property_exists($test, 'x')); var_dump(isset($test->x));
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) isset x ( returns 0 )bool(false) set x = 42 Deprecated: Creation of dynamic property test::$x is deprecated in /in/ZTQJB on line 14 bool(true) bool(true)

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