Simulate a simple "warning" in PHP -


how can simulate or force warning in php? there simple , common way this? thank you!

i need example script, because webserver doesn't send output, if there warning @ script. error_handling(e_all) displays warning regular output, error_handling(0) hides not warning, hides regular output ...? 

<?php $test=2; if ($test>1) { trigger_error("a custom error has been triggered"); } ?>

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