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<?php class Base {}; class Test1 extends Base {}; class Test2 extends Base {}; $base = new Base(); $test_2 = new Test2(); $test_1 = new Test1(); var_dump($base == $test_1); var_dump($base == $test_2); var_dump($test_1 == $test_2); class DateTime1 extends DateTime {}; class DateTime2 extends DateTime {}; class DateTime3 extends DateTime2 {}; $date_1 = new DateTime1("2009-02-12 12:47:41 GMT"); $date_2 = new DateTime2("2009-02-12 12:47:41 GMT"); $date_3 = new DateTime3("2009-02-12 12:47:41 GMT"); var_dump($date_1 == $date_2); var_dump($date_1 == $date_3); var_dump($date_2 == $date_3);
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(false) bool(false) bool(true) bool(true) bool(true)

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