This PHP Mistake Happens to Everyone (But Nobody Knows the Fix) #php #shorts

Getting this PHP error and have no idea why?
Warning: Cannot modify header information - headers already sent

This one mistake breaks ALL your redirects! 😱

❌ Wrong Code:
echo 'Hello';
header('Location: home.php');
-- Output already sent to browser
-- header() fails completely
-- User is stuck, redirect never happens!

✅ Correct Code:
header('Location: home.php');
exit;
-- header() called before any output
-- Redirect works perfectly every time
-- exit; stops accidental output after redirect

💡 Why does this happen?
HTTP headers must reach the browser BEFORE any content. Even a single space, blank line, or echo statement counts as output. Once PHP sends even 1 byte, headers are gone and cannot be modified.

⚡ Pro Tips:
-- Always call header() before ANY echo or HTML
-- Always add exit; after every header() redirect
-- Check for hidden whitespace before php tag
-- BOM characters in UTF-8 files also trigger this!
-- Use ob_start() as safety net in large projects

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Видео This PHP Mistake Happens to Everyone (But Nobody Knows the Fix) #php #shorts канала CodePractice