Is it necessary to convert all PHP files to UTF-8 without BOM encoding to avoid character display issues on web pages?

It is not always necessary to convert all PHP files to UTF-8 without BOM encoding, but it can help avoid character display issues on web pages, especially when dealing with multilingual content. The BOM (Byte Order Mark) can cause unexpected characters to be displayed at the beginning of the file, which can interfere with the proper rendering of the PHP output. Converting PHP files to UTF-8 without BOM encoding ensures consistent character encoding and helps prevent display issues.

// Add this line at the beginning of your PHP file to ensure UTF-8 encoding without BOM
header('Content-Type: text/html; charset=utf-8');