Merge pull request #78 from andreybolonin/master

fix php 7.4 deprecations

Author: khanamiryan

lib/Common/BitMatrix.php

@@ -39,7 +39,7 @@ public static function parse($stringRepresentation, $setString, $unsetString)
         $nRows       = 0;
         $pos         = 0;
         while ($pos < strlen($stringRepresentation)) {
-            if ($stringRepresentation{$pos} == '\n' ||
+            if ($stringRepresentation[$pos] == '\n' ||
                 $stringRepresentation->{$pos} == '\r') {
                 if ($bitsPos > $rowStartPos) {
                     if ($rowLength == -1) {

lib/Qrcode/Decoder/DecodedBitStreamParser.php

@@ -266,8 +266,8 @@ private static function decodeAlphanumericSegment($bits,
         if ($fc1InEffect) {
             // We need to massage the result a bit if in an FNC1 mode:
             for ($i = $start; $i < strlen($result); $i++) {
-                if ($result{$i} == '%') {
-                    if ($i < strlen($result) - 1 && $result{$i + 1} == '%') {
+                if ($result[$i] == '%') {
+                    if ($i < strlen($result) - 1 && $result[$i + 1] == '%') {
                         // %% is rendered as %
                         $result = substr_replace($result, '', $i + 1, 1);//deleteCharAt(i + 1);
                     } else {