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Warning in php.ini

Warning in php.ini
Warning: - it is same as notice display some warning to the user.  It we are trying to access undefined constants trying to open undefined files etc the out opt is warning.
 Warning message will not stop the execution of script.
 By using define keyword we can defined the constants.

<?php

Define (“city”,”Hyderabad”);
Print constant (“city”);
Print constant (“state”);
Print “next line”;
?>

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