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How to use RegexIterator in PHP?
Regular expression
$directory = new RecursiveDirectoryIterator(__DIR__);
$flattened = new RecursiveIteratorIterator($directory);
// Make sure the path does not contain "/.Trash*" folders and ends eith a .php or .html file
$files = new RegexIterator($flattened, '#^(?:[A-Z]:)?(?:/(?!\.Trash)[^/]+)+/[^/]+\.(?:php|html)$#Di');
foreach($files as $file) {
echo $file . PHP_EOL;
}Using filters
A base class holds the regex that needs to be used with the filter.
classes which will extend this one. The RecursiveRegexIterator is extended.
abstract class FilesystemRegexFilter extends RecursiveRegexIterator {
protected $regex;
public function __construct(RecursiveIterator $it, $regex) {
$this->regex = $regex;
parent::__construct($it, $regex);
}
}They are basic filters and work with the file and directory name respectively.
class FilenameFilter extends FilesystemRegexFilter {
// Filter files with the help of regex
public function accept() {
return ( ! $this->isFile() || preg_match($this->regex, $this->getFilename()));
}
}
class DirnameFilter extends FilesystemRegexFilter {
// Filter directories with the help of regex
public function accept() {
return ( ! $this->isDir() || preg_match($this->regex, $this->getFilename()));
}
}The below code iterates recursively over the directory contents. The trash folders are filtered out and only PHP and HTML files are retained.
$directory = new RecursiveDirectoryIterator(__DIR__);
// Filter out ".Trash*" folders
$filter = new DirnameFilter($directory, '/^(?!\.Trash)/');
// Filter PHP/HTML files
$filter = new FilenameFilter($filter, '/\.(?:php|html)$/');
foreach(new RecursiveIteratorIterator($filter) as $file) {
echo $file . PHP_EOL;
}Scanning up to 2 levels deep using the above code
$files = new RecursiveIteratorIterator($filter);
$files->setMaxDepth(1); // Two levels, the parameter is zero-based.
foreach($files as $file) {
echo $file . PHP_EOL;
}
Updated on: 07-Apr-2020
211 Views
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