What are common reasons for the "Cannot send session cache limiter - headers already sent" error in PHP?

The "Cannot send session cache limiter - headers already sent" error in PHP occurs when there is output sent to the browser before session_start() is called. This can be caused by whitespace or HTML tags before the opening <?php tag, or by output generated by functions like echo or print. To solve this issue, ensure that session_start() is called before any output is sent to the browser. 

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

// Your PHP code here
?&gt;

Keywords

session cache limiter headers already sent PHP error output buffering session_start

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