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USING PHP TO MANAGE FILES $fileTypes = array(’jpg’,'jpeg’,'gif’,'png’); // traverse folder, and add file to $found array if type matches $found = array(); foreach ($contents as $item) { $fileInfo = pathinfo($item); if (array_key_exists(’extension’, $fileInfo) && . in_array($fileInfo[’extension’],$fileTypes)) { $found[] = $item; } } // Check the $found array is not empty if ($found) { // sort in natural, case-insensitive order, and populate menu natcasesort($found); foreach ($found as $filename) { echo “$filenamen”; } } } } How the buildFileList() function works I suspect many readers will be happy just to use the function, but if you re curious as to how it works, here s a brief description to flesh out the inline comments. After the folder has been opened, each item is passed to a PHP function called pathinfo(), which returns an associative array with the following elements: dirname: The name of the directory (folder) basename: The filename, including extension (or just the name if it s a directory) extension: The filename extension (not returned for a directory) Because the extension element is not returned for a directory, you need to use array_key_exists() before attempting to check its value. The second half of the condi tional statement in line 12 uses in_array() to see if the value of extension matches one of the file types that you re looking for. It there s a match, the filename is added to the $found array. It s then just a case of building the elements with a foreach loop, but to add a user-friendly touch, the $found array is first passed to the natcasesort() function, which sorts the filenames in a case-insensitive order. Automatically creating the next file in a series In the last chapter I showed you how to create a unique filename by adding a timestamp or using the date() function to generate the date and time in human-readable format. It works, but is hardly ideal. A numbered series, such as file01.txt, file02.txt, and so on, is usually better. The problem is that a PHP script has no way to keep track of a series of numbers between requests to the server. However, by inspecting the contents of a direc tory, you can use pattern matching to find the highest existing number, and assign the next one in the series. 199
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