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<?php trait base_trait { protected $prop = []; function __construct() { var_dump($this->prop); } } class base_class { use base_trait; } class test_class_property extends base_class { protected $prop = ['a' => 'b']; } trait overlay_trait { protected $prop = ['a' => 'b']; } class test_class_overlay extends base_class { use overlay_trait; } new base_class; new test_class_property; new test_class_overlay;
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: base_class and overlay_trait define the same property ($prop) in the composition of test_class_overlay. However, the definition differs and is considered incompatible. Class was composed in /in/7qdmA on line 29
Process exited with code 255.

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