Is the (!headers_sent()) check necessary for sending headers in PHP, and what potential issues could arise from using it?

The `(!headers_sent())` check is not necessary for sending headers in PHP, as headers can be sent without this check. However, using this check can help prevent potential issues such as headers already being sent, which can cause errors in the script execution. 

if (!headers_sent()) {
    header('Content-Type: text/html');
    // Other headers to be sent
}

Keywords

headers_sent PHP sending headers potential issues error types

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