How can HTML tags accidentally inserted into PHP files affect their functionality?

Accidentally inserting HTML tags into PHP files can cause syntax errors or unexpected output. To prevent this issue, always make sure to separate PHP code from HTML content by using PHP opening and closing tags <?php ?>. This ensures that PHP code is executed properly without any interference from HTML tags. 

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

Keywords

HTML tags PHP files functionality parsing errors syntax errors

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