How can PHP developers effectively troubleshoot and debug warnings related to headers already sent in their code?

When PHP developers encounter warnings related to headers already sent, it typically means that there was output sent to the browser before PHP could send headers, which is required for certain functions like setting cookies or redirecting users. To troubleshoot this issue, developers should check for any whitespace or HTML tags before the opening <?php tag in their code, as these can cause output to be sent prematurely. Additionally, using output buffering functions like ob_start() can help capture output before headers are sent. 

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

// Your PHP code here

ob_end_flush(); // Flush the output buffer

Keywords

output buffering ob_start headers_sent error_reporting php.ini

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