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<?php set_error_handler(function ($errno, $errstr) { var_dump($errstr); }, E_USER_DEPRECATED); @trigger_error('Will only be seen for a custom error handler', E_USER_DEPRECATED);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
string(44) "Will only be seen for a custom error handler"
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124.96 ms | 2018 KiB | 4 Q