What are the potential pitfalls of having whitespace or characters before <?php or after ?> in PHP scripts?

Having whitespace or characters before <?php or after ?> in PHP scripts can cause unwanted output or errors, especially when trying to send headers or set cookies. To avoid this issue, ensure that there is no whitespace or characters before <?php and after ?> in your PHP scripts. 

&lt;?php
// Your PHP code here
?&gt;

Keywords

whitespace characters <?php ?> PHP scripts

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