How can PHP error logs be utilized to troubleshoot issues like a blank window after a header redirect?

When encountering a blank window after a header redirect in PHP, it is likely that there is some output being sent before the header function is called. To troubleshoot this issue, you can check the PHP error logs for any warnings or errors that may indicate where the output is being sent. Once you identify and remove the output before the header redirect, the issue should be resolved. 

<?php
// Check for any output before header redirect
ob_start();

// Your PHP code here

// Redirect after checking for output
if (headers_sent()) {
    // Handle error or redirect here
    error_log("Headers already sent in file: " . __FILE__ . " on line " . __LINE__);
} else {
    header('Location: newpage.php');
    exit();
}
ob_end_flush();
?>

Keywords

PHP error logs troubleshooting header redirect blank window debugging

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