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<?php $foo = ''; echo "\r\nTest with == \r\n"; if ($foo == null) { echo 'foo is null'; } else { echo 'foo is not null'; } echo "\r\n-------------------\r\n"; echo "\r\nTest with ===\r\n"; if ($foo === null) { echo 'foo is null'; } else { echo 'foo is not 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, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Test with == foo is null ------------------- Test with === foo is not null
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240.48 ms | 406 KiB | 356 Q