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<?php set_error_handler( function($code, $message, $file, $line) { if ($code === E_USER_DEPRECATED) { return; } printf('%s: %s', $code, $message); } ); print $a;
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
2: Undefined variable $a
Output for 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: Undefined variable: a

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