CODEWITHSUNDEEP
phpregexglob
W.D.
W.D.

Reputation: 1041

RegEx and glob()

So here is my problem.

I want to select only those files from the folder, which name contains only letters and numbers with specific file extensions.

Here is the pattern 

$files = glob($somedir.'/[a-zA-Z0-9]{4,71}.{jpeg,png}',GLOB_BRACE);

When I print it out print_r($files) it returns an empty array.

Is it possible to use regex with glob() and which part should I correct in my code?

If there is something I can improve in my question, let me know.

Upvotes: 0

Views: 171

Answers (2)

Mark Baker
Mark Baker

Reputation: 212412

This is where SPL's iterators can be very useful as an alternative to glob(), allowing you to use a full regexp

class ImageFilterIterator extends FilterIterator {
    // overwriting the accept method to perform a super simple test to
    // determine if the files found were images (types we want at least) or 
    // not..
    public function accept() {
        if (preg_match('/^[a-z0-9]{4,71}\.(gif|jpe?g|png)$/i',$this->getExtension())) {
            return true;
        } else {
            return false;
        }
    }
} 


$path = dirname(__FILE__);

foreach(new ImageFilterIterator(new FilesystemIterator($path)) as $image) {
    echo $image, PHP_EOL;
}

Upvotes: 1

Yirkha
Yirkha

Reputation: 13818

glob() does not work with regular expressions, only with shell patterns - see its documentation. And they are limited.

You can use a loop instead along these lines:

$files = array();
$dir = opendir($somedir);
while (($fname = readdir($dir)) !== false) {
  if (preg_match('/^[a-zA-Z0-9]{4,71}\.(jpeg|png)$/', $fname))
    $files[] = "$somedir/$fname";
}
closedir($dir);

Upvotes: 0

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