In what situations should the PHP include function be used cautiously to avoid conflicts with header commands and output?

When using the PHP include function, it should be used cautiously to avoid conflicts with header commands and output. This is because including a file that outputs content before headers are sent can result in errors like "Cannot modify header information." To avoid this issue, it's best to include files that only contain PHP code without any output or HTML content. 

ob_start();
include 'file.php';
ob_end_clean();

Keywords

PHP include header commands output conflicts caution

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