Find files with a given extension in a directory tree

Question

I have a folder in which I have some files and sub-folders. I need to return the names of the files or relative address (if the file is in sub-folder) that have a given extension, for example .html.

For example this is structure of given folder:

• /text/something.ncx
• /text/123.html
• content.opf
• toc.ncx
• Flow_0.html
• Flow_1.html
• Flow_2.html

So the code should return this (in an array ideally):

• text/123.html
• Flow_0.html
• Flow_1.html
• Flow_2.html

It's just pulling out names with .html extension, but I really don't how to solve this.

Answer 1

You could use a RecursiveDirectoryIterator to get all files recursively, then filter the result with a RegexIterator to iterate over only the *.html files. To get the relative adress, RecursiveDirectoryIterator::getSubPathname() can be used.

$directory  = '../path/to/your/folder';
$all_files  = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($directory));
$html_files = new RegexIterator($all_files, '/\.html$/');

foreach($html_files as $file) {
    echo $html_files->getSubPathname(), PHP_EOL;
}

If you really need and array (with iterable objects you often don't), you can easily build one up in the foreach rather than echo-ing each subpath.