HTTP

How to find out if a request came via AJAX
To distinguish between direct and AJAX requests, simply check the value of the $ _SERVER global variable
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How to set up Last-Modified
The Last-Modified header helps to optimize the loading of web pages and make the job easier for search engines.
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Heading with a horizontal line in the middle
One way to make a heading with a horizontal line in the center without an image (background-image).
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Automatic setting of the user's time zone
date_default_timezone_set sets the default timezone used by all date / time functions.
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