From 964f37ba9601030aae8c3bcb331cee908be9b0eb Mon Sep 17 00:00:00 2001
From: smiley <codemasher@users.noreply.github.com>
Date: Sun, 5 Jun 2022 21:08:04 +0200
Subject: [PATCH] :octocat: QRMatrix: added several isset() checks to get/set
 methods

---
 src/Data/QRMatrix.php | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/src/Data/QRMatrix.php b/src/Data/QRMatrix.php
index f9509c46d..bd93f7fec 100755
--- a/src/Data/QRMatrix.php
+++ b/src/Data/QRMatrix.php
@@ -158,9 +158,14 @@ class QRMatrix{
 	}
 
 	/**
-	 * Returns the value of the module at position [$x, $y]
+	 * Returns the value of the module at position [$x, $y] or -1 if the coordinate is outside of the matrix
 	 */
 	public function get(int $x, int $y):int{
+
+		if(!isset($this->matrix[$y][$x])){
+			return -1;
+		}
+
 		return $this->matrix[$y][$x];
 	}
 
@@ -171,7 +176,10 @@ class QRMatrix{
 	 *   false => $M_TYPE
 	 */
 	public function set(int $x, int $y, bool $value, int $M_TYPE):self{
-		$this->matrix[$y][$x] = $M_TYPE | ($value ? $this::IS_DARK : 0);
+
+		if(isset($this->matrix[$y][$x])){
+			$this->matrix[$y][$x] = $M_TYPE | ($value ? $this::IS_DARK : 0);
+		}
 
 		return $this;
 	}
@@ -180,7 +188,10 @@ class QRMatrix{
 	 * Flips the value of the module
 	 */
 	public function flip(int $x, int $y):self{
-		$this->matrix[$y][$x] ^= $this::IS_DARK;
+
+		if(isset($this->matrix[$y][$x])){
+			$this->matrix[$y][$x] ^= $this::IS_DARK;
+		}
 
 		return $this;
 	}
@@ -191,6 +202,11 @@ class QRMatrix{
 	 *   true => $value & $M_TYPE === $M_TYPE
 	 */
 	public function checkType(int $x, int $y, int $M_TYPE):bool{
+
+		if(!isset($this->matrix[$y][$x])){
+			return false;
+		}
+
 		return ($this->matrix[$y][$x] & $M_TYPE) === $M_TYPE;
 	}