When working with file names in PHP arrays, what strategies can be employed to efficiently handle different file name formats, such as those with prefixes like "img_" or "cimg_"?

When working with file names in PHP arrays that have different prefixes like "img_" or "cimg_", one strategy to efficiently handle them is to use regular expressions to filter out the desired file names based on the prefix. By using preg_grep() function along with a regex pattern, you can easily extract only the file names that match the specified prefix.

$files = ['img_file1.jpg', 'cimg_file2.png', 'img_file3.jpg', 'cimg_file4.png'];

$prefix = 'img_'; // specify the prefix to filter

$filtered_files = preg_grep('/^' . preg_quote($prefix) . '/', $files);

print_r($filtered_files);