Merge pull request #4 from joserick/master

[pull] master from joserick:master

README.md

@@ -83,7 +83,7 @@ echo $png_metadata->get('exif:DateTime'); // Return a value, a array or false.
 
 ### Example 3 - Types
 
-Print the metadata types (IHDR, SRBG, BKGD, EXIF, XMP, CRS, DATE, DC, ICC, AUX, ...).
+Print the metadata types (IHDR, sRGB, BKGD, EXIF, XMP, CRS, DATE, DC, ICC, AUX, ...).
 
 ```php
 $png_metadata = new PNGMetadata('./Path/Photo.png');

src/PNGMetadata.php

@@ -26,7 +26,7 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
- * PNG Metadata class for extraction of XMP, TEXIF, EXIF, BKGD, RBG and IHDR.
+ * PNG Metadata class for extraction of XMP, TEXIF, EXIF, BKGD, sRGB and IHDR.
  *
  * Returns the complete information found in the different types
  * of metadata within a PNG format image.
@@ -91,7 +91,7 @@ public function __construct(string $path)
 		$this->extractTExif();
 		$this->extractExif();
 		$this->extractBKGD();
-		$this->extractRBG();
+		$this->extractRGB();
 		$this->extractIHDR();
 		ksort($this->metadata);
 
@@ -438,17 +438,17 @@ private function extractBKGD(): void
 
 
 	/**
-	 * Extract RBG type from sRBG chunk as a array.
+	 * Extract RGB type from sRGB chunk as a array.
 	 *
 	 * @see PNGMetadata::$metadata For the property whose metadata are storage.
 	 * @see PNGMetadata::$chunks For the property whose chunks data are storage.
 	 */
-	private function extractRBG(): void
+	private function extractRGB(): void
 	{
 		if (isset($this->chunks['sRGB'])) {
-			$rbg = ['Perceptual', 'Relative Colorimetric', 'Saturation', 'Absolute Colorimetric'];
+			$rgb = ['Perceptual', 'Relative Colorimetric', 'Saturation', 'Absolute Colorimetric'];
 			$unpacked = unpack('C', $this->chunks['sRGB']);
-			$this->metadata['sRBG'] = $rbg[end(...$unpacked)];
+			$this->metadata['sRGB'] = $rgb[end($unpacked)] ?? 'Unknown';
 		}
 	}