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--TEST-- Potentially conflicting properties should result in a strict notice. Property use is discorage for traits that are supposed to enable maintainable code reuse. Accessor methods are the language supported idiom for this. --FILE-- <?php error_reporting(E_ALL); trait THello1 { private $foo; } trait THello2 { private $foo; } echo "PRE-CLASS-GUARD-TraitsTest\n"; error_reporting(E_ALL & ~E_STRICT); // ensuring that it is only for E_STRICT class TraitsTest { use THello1; use THello2; } error_reporting(E_ALL | E_STRICT); echo "PRE-CLASS-GUARD-TraitsTest2\n"; class TraitsTest2 { use THello1; use THello2; } var_dump(property_exists('TraitsTest', 'foo')); var_dump(property_exists('TraitsTest2', 'foo')); ?> --EXPECTF-- PRE-CLASS-GUARD-TraitsTest PRE-CLASS-GUARD-TraitsTest2 Strict Standards: THello1 and THello2 define the same property ($foo) in the composition of TraitsTest2. This might be incompatible, to improve maintainability consider using accessor methods in traits instead. Class was composed in %s on line %d bool(true) bool(true)