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<?php interface TestInterface {} class TestClass implements TestInterface {} $time = time(); for ($i = 0; $i < 1000000; $i++) { is_a('TestClass', 'TestInterface', true); } var_dump(sprintf('is_a time: %s', time() - $time));
Output for 5.4.0 - 5.4.4, 5.4.6, 5.4.12 - 5.4.13, 5.4.15, 5.4.18 - 5.4.19, 5.4.23 - 5.4.25, 5.4.27 - 5.4.29, 5.4.33 - 5.4.34, 5.4.37, 5.4.40 - 5.4.41, 5.4.44 - 5.4.45, 5.5.1 - 5.5.2, 5.5.4 - 5.5.5, 5.5.8 - 5.5.10, 5.5.14 - 5.5.15, 5.5.18 - 5.5.19, 5.5.21 - 5.5.22, 5.5.25 - 5.5.26, 5.5.30, 5.5.33, 5.5.35, 5.5.38, 5.6.0, 5.6.4, 5.6.7 - 5.6.8, 5.6.11 - 5.6.12, 5.6.16 - 5.6.17, 5.6.20, 5.6.22, 5.6.24, 5.6.28 - 5.6.30, 5.6.34 - 5.6.35, 5.6.37, 5.6.39 - 5.6.40, 7.0.0 - 7.0.2, 7.0.4 - 7.0.6, 7.0.8, 7.0.10 - 7.0.20, 7.0.22 - 7.0.33, 7.1.0, 7.1.3 - 7.1.8, 7.1.10 - 7.1.17, 7.1.19 - 7.1.29, 7.1.31 - 7.1.33, 7.2.0 - 7.2.3, 7.2.6, 7.2.9, 7.2.11 - 7.2.13, 7.2.16 - 7.2.26, 7.3.0 - 7.3.1, 7.3.3 - 7.3.5, 7.3.7 - 7.3.13, 7.4.0 - 7.4.1
string(12) "is_a time: 0"
Output for 5.4.5, 5.4.7 - 5.4.11, 5.4.14, 5.4.16 - 5.4.17, 5.4.20 - 5.4.22, 5.4.26, 5.4.30 - 5.4.32, 5.4.35 - 5.4.36, 5.4.38 - 5.4.39, 5.4.42 - 5.4.43, 5.5.0, 5.5.3, 5.5.6 - 5.5.7, 5.5.11 - 5.5.13, 5.5.16 - 5.5.17, 5.5.20, 5.5.23 - 5.5.24, 5.5.27 - 5.5.29, 5.5.31 - 5.5.32, 5.5.34, 5.5.36 - 5.5.37, 5.6.1 - 5.6.3, 5.6.5 - 5.6.6, 5.6.9 - 5.6.10, 5.6.13 - 5.6.15, 5.6.18 - 5.6.19, 5.6.21, 5.6.23, 5.6.25 - 5.6.27, 5.6.31 - 5.6.33, 5.6.36, 5.6.38, 7.0.3, 7.0.7, 7.0.9, 7.0.21, 7.1.1 - 7.1.2, 7.1.9, 7.1.18, 7.1.30, 7.2.4, 7.2.10, 7.2.14 - 7.2.15, 7.3.2, 7.3.6
string(12) "is_a time: 1"
Output for 7.2.5, 7.2.7 - 7.2.8

Process exited with code 137.

preferences:
177.63 ms | 402 KiB | 242 Q