How can the presence of whitespace or characters after PHP closing tags impact PHP scripts and cause errors like "headers already sent"?

The presence of whitespace or characters after PHP closing tags can cause "headers already sent" errors because any output sent to the browser before sending headers will result in this error. To solve this issue, ensure that there is no whitespace or characters after PHP closing tags in your scripts. 

<?php
// Correct way to end a PHP script
?>

Keywords

whitespace characters closing tags headers already sent errors

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