PHP Errors are not showing up in the browser

You can also add custom error reporting to your php and test with that:

<?php
    error_reporting( E_ALL );
    ini_set( "display_errors", 1 );
    require_once( "sample.php" );
?>

If you get fatals, then something is wrong with php.ini configuration ( maybe you have multiple php.ini files? ). If you still get nothing, then php can find the file ( maybe you have some redirects set up? Maybe some strange extensions? )

I found the problem. Actually, PHP is installed with XDebug extension. So the problem is in that extension. Even i was not aware of that. Because this system was used by someone previously. I uninstalled and installed again with new supported version. It works now. Thanks and sorry for the inconvenience friends.