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<?php class A {} var_dump(is_nan('NaN'));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: is_nan(): Argument #1 ($num) must be of type float, string given in /in/qeidQ:4 Stack trace: #0 /in/qeidQ(4): is_nan('NaN') #1 {main} thrown in /in/qeidQ on line 4
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: is_nan() expects parameter 1 to be float, string given in /in/qeidQ on line 4 NULL
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Warning: is_nan() expects parameter 1 to be double, string given in /in/qeidQ on line 4 NULL

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