Pass flags into imdecode and added test

source/opencv2/opencv_imgcodecs.cc

@@ -99,7 +99,7 @@ PHP_FUNCTION(opencv_imdecode)
     object_init_ex(&instance,opencv_mat_ce);
     opencv_mat_object *obj = Z_PHP_MAT_OBJ_P(&instance);
 
-    Mat im = imdecode(Mat(1, buf_len, CV_8UC1, buf), CV_LOAD_IMAGE_UNCHANGED);
+    Mat im = imdecode(Mat(1, buf_len, CV_8UC1, buf), (int)flags);
     if(im.empty() || !im.data){
         char *error_message = (char*)malloc(strlen("Can not load image") + 1);
         strcpy(error_message,"Can not load image");

tests/faceRecognizerDecode.phpt

@@ -0,0 +1,42 @@
+--TEST--
+LBPHFaceRecognizer with Decode
+--SKIPIF--
+<?php if (!extension_loaded("opencv")) print "skip"; ?>
+--FILE--
+<?php
+use CV\Face\LBPHFaceRecognizer;
+use function CV\{imdecode, cvtColor, equalizeHist};
+use const CV\{COLOR_BGR2GRAY};
+
+$faceRecognizer = LBPHFaceRecognizer::create();
+
+//hihozhou
+$str = file_get_contents('./tests/face_recognizer.jpg');
+$src = imdecode($str);
+$gray = cvtColor($src, COLOR_BGR2GRAY);
+equalizeHist($gray, $gray);
+
+$faceRecognizer->train([$gray], [1]);
+
+//Obama
+$str = file_get_contents('./tests/Obama.png');
+$src = imdecode($str);
+$gray = cvtColor($src, COLOR_BGR2GRAY);
+equalizeHist($gray, $gray);
+
+//Obama grey
+$faceRecognizer->train([$gray], [41]);
+
+$str = file_get_contents('./tests/Obama_gray.png');
+$src = imdecode($str);
+$gray = cvtColor($src, COLOR_BGR2GRAY);
+equalizeHist($gray, $gray);
+
+$faceLabel = $faceRecognizer->predict($gray, $faceConfidence);
+
+$faceLabel = $faceRecognizer->predict($gray);
+
+echo "{$faceLabel}";
+?>
+--EXPECT--
+41