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What are the differences between carriage return (cr), linefeed (lf), and crlf in terms of representing line breaks in PHP and how should they be handled?

When dealing with line breaks in PHP, it's important to understand the differences between carriage return (CR), linefeed (LF), and carriage return fo...

What is the purpose of using $_SERVER['HTTP_REFERER'] in PHP and what are the potential reasons for it to return empty?

The purpose of using $_SERVER['HTTP_REFERER'] in PHP is to retrieve the URL of the page that referred the user to the current page. This can be useful...

What is the difference between including PHP files with and without the HTTP protocol?

When including PHP files without the HTTP protocol, the files are included as local files on the server, which can be more efficient and secure. Howev...

How can PHP beginners differentiate between posting questions in beginner forums versus professional forums?

Beginner forums are typically geared towards those who are new to PHP and may have basic questions or need help with fundamental concepts. Professiona...

How can absolute and relative paths be correctly defined and utilized in JpGraph configurations for PHP?

To correctly define and utilize absolute and relative paths in JpGraph configurations for PHP, it is important to understand the difference between th...