src/Subjects/FileResolver/SimpleFileResolver.php
protected function getPatternKeys()
    {

        // load the pattern keys from the configuration
        $patternKeys = $this->getPatternElements();

        // make sure that they are all lowercase
        array_walk($patternKeys, function (&$value) {
            $value = strtolower($value);
        });

        // return the pattern keys
        return $patternKeys;
    }
protected function getPatternKeys()
    {

        // load the pattern keys from the configuration
        $patternKeys = $this->getPatternElements();

        // make sure that they are all lowercase
        array_walk($patternKeys, function (&$value) {
            $value = strtolower($value);
        });

        // return the pattern keys
        return $patternKeys;
    }
Returns the elements the filenames consists of, converted to lowercase.

@return array The array with the filename elements