php-faq
Cannot modify header information - headers already sent by
Cookies are not saved. What's wrong.
Error
Warning: Cannot modify header information - headers already sent by (output started at blocksSite/main_noauth.php:4) in blocksSite/main_noauth.php on line 58
How and by what means to find errors in PHP code?
When developing, sometimes the code does not work as intended or does not work at all. I sit and wonder: what is wrong and wh ... nd I want them to to be.
Question: what are the ways to find errors in PHP code? What tools, methods, plugins, paths, etc.?