<?php

/**
* Return type of file by extension
* @param  string $filePath File path/link
* @return string           One of: image, pdf, video, other
*/
function fileExtensionType($filePath)
{
	// types of files (add if necessary)
	$fileTypes = [
		'jpg' => 'image', 'jpeg' => 'image', 'png' => 'image', 'bmp' => 'image', 'gif' => 'image',
		'avi' => 'video', 'ogg' => 'video', 'mp4' => 'video', 'mpg' => 'video',
		'pdf' => 'pdf'
		];

	// calculate the extension
	$info = pathinfo($pathinfo);
	$extension = $info['extension'];
	if (!$extension) {
		return "other";
	}

	return isset($fileTypes[$extension]) ? $fileTypes[$extension] : "other";
}
?>