What are the potential pitfalls of having whitespace before <?php in a PHP file?

Having whitespace before <?php in a PHP file can cause headers already sent errors, as any output before the opening PHP tag will be sent to the browser. To solve this issue, ensure there is no whitespace or output before the <?php tag in your PHP files. 

&lt;?php
// Your PHP code here

Keywords

whitespace <?php PHP file syntax error code execution

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