As experienced web developer what is the cause of this issue?

Thank you so much to those who tried to help me regarding this issue and if I am not mistaken, there is one who also posted such an issue like me. Today I have been hassled after several months and have found a problem the issue was if you do twice PHP close in the same function it will produce that on entire application regardless what.....

PHP Code:

<?PHP 
// you data
//?>

<?php

// then 

?>

twice, that issue will be caused

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