How can PHP beginners troubleshoot issues related to headers already sent?

When PHP beginners encounter issues related to "headers already sent," it typically means that there was output (such as whitespace) sent to the browser before PHP could send headers. To troubleshoot this, beginners should check for any whitespace or HTML tags before the opening `<?php` tag in their PHP files. They should also ensure that there are no `echo` or `print` statements before sending headers. 

&lt;?php
ob_start(); // Start output buffering

// Your PHP code here

ob_end_flush(); // Flush the output buffer

Keywords

output buffering ob_start header whitespace error_reporting

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