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run code in 200+ php & hhvm versions
<?php trait MyTrait { protected $attr = self::class . 'Test'; public function test() { return $this->attr; } } class A { use MyTrait; } class B { use MyTrait; } $a = new A(); $b = new B(); var_dump($a->test()); var_dump($b->test());
based on JP7nM
Output for 5.6.17 - 5.6.30, 7.0.1 - 7.0.30, 7.3.0 - 7.3.1
string(5) "ATest" string(5) "BTest"
Output for 7.1.0 - 7.2.13
string(5) "ATest" string(5) "ATest"
Output for 5.6.0 - 5.6.4, hhvm-3.10.1 - 3.22.0, 7.0.0
string(11) "MyTraitTest" string(11) "MyTraitTest"
Output for 5.6.5 - 5.6.16

Process exited with code 139.
Output for 5.5.21 - 5.5.38
Parse error: syntax error, unexpected '.', expecting ',' or ';' in /in/dQ6hM on line 4
Process exited with code 139.
Output for 5.5.0 - 5.5.20
Parse error: syntax error, unexpected '.', expecting ',' or ';' in /in/dQ6hM on line 4
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) in /in/dQ6hM on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_STRING in /in/dQ6hM on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/dQ6hM on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/dQ6hM on line 3
Process exited with code 255.