What's the Most Efficient Way to Get a File's Extension in PHP?

How to Get a File's Extension Efficiently in PHP

While there are numerous solutions to retrieve a file's extension in PHP, one question persists: which is the most optimal approach?

The Superior Method

Contrary to popular belief, PHP does offer a built-in function specifically designed for this purpose: pathinfo(). This highly efficient function provides a multitude of file information, including its extension.

$ext = pathinfo($filename, PATHINFO_EXTENSION);

pathinfo() can also extract other useful information about the file, depending on the constant specified. By default, it retrieves the file extension.

Considerations

• For non-ASCII characters, set the locale using setlocale(LC_ALL, 'en_US.UTF-8') before using pathinfo().
• This solution yalnızca handles file paths. For URL resources, use PARSE_URL.

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