..F....... [ZBXNEXT-7722] fixed runtime errors when using Zabbix with PHP 8.1

* commit '999c508c4f25f8f05c69c4b1f07b9a22457d022a':
  .......... [ZBXNEXT-7722] replaced error message in autotest
  ..F....... [ZBXNEXT-7722] fixed graph line being drawn with an upward offset of one pixel
  ..F....... [ZBXNEXT-7722] fixed runtime error "implicit conversion from float to int loses precision"
  ..F....... [ZBXNEXT-7722] fixed code style
  ..F....... [ZBXNEXT-7722] fixed runtime errors "implicit conversion from float to integer loses precision"
  ..F....... [ZBXNEXT-7722] fixed runtime error "implicit conversion from float to integer loses precision"
  ..F....... [ZBXNEXT-7722] fixed code style
  ..F....... [ZBXNEXT-7722] fixed code style
  ..F....... [ZBXNEXT-7722] fixed runtime error "implicit conversion from float to integer loses precision"
  ..F....... [ZBXNEXT-7722] fixed imagepolygon() and imagefilledpolygon() expect different number of parameters prior to PHP 8.1.0 and after
  ..F....... [ZBXNEXT-7722] fixed runtime error "implicit conversion from float to integer loses precision"
  ..F....... [ZBXNEXT-7722] fixed code style
  ..F....... [ZBXNEXT-7722] fixed runtime error "implicit conversion from float to integer loses precision"
  .D........ [ZBXNEXT-7722] added changelog file
  ..F....... [ZBXNEXT-7722] fixed runtime errors when using Zabbix with PHP 8.1

13 files changed, 135 insertions, 151 deletions

diff --git a/ChangeLog.d/feature/ZBXNEXT-7722 b/ChangeLog.d/feature/ZBXNEXT-7722
new file mode 100644
index 00000000000..3851ec3fd60
--- /dev/null
+++ b/ChangeLog.d/feature/ZBXNEXT-7722
@@ -0,0 +1 @@
+..F....... [ZBXNEXT-7722] fixed runtime errors when using Zabbix with PHP 8.1 (agriscenko)
diff --git a/ui/chart4.php b/ui/chart4.php
index f20c2367167..3c4126d029f 100644
--- a/ui/chart4.php
+++ b/ui/chart4.php
@@ -138,9 +138,9 @@ $maxX = 900;
 $minX = 0;
 
 for ($i = 1; $i <= $weeks; $i++) {
-	$x1 = (900 / 52) * $sizeX * ($i - 1 - $minX) / ($maxX - $minX);
+	$x1 = (int) ((900 / 52) * $sizeX * ($i - 1 - $minX) / ($maxX - $minX));
 
-	$yt = $sizeY * $true[$i - 1] / 100;
+	$yt = (int) ($sizeY * $true[$i - 1] / 100);
 	if ($yt > 0) {
 		imagefilledrectangle($im, $x1 + $shiftX, $shiftYup, $x1 + $shiftX + 8, $yt + $shiftYup, imagecolorallocate($im, 235, 120, 120)); // red
 	}
diff --git a/ui/include/classes/core/ZBase.php b/ui/include/classes/core/ZBase.php
index 57aecf30828..6c3afe84c07 100644
--- a/ui/include/classes/core/ZBase.php
+++ b/ui/include/classes/core/ZBase.php
@@ -490,7 +490,11 @@ class ZBase {
 		$action_class = $router->getController();
 
 		try {
-			if (!class_exists($action_class, true)) {
+			if ($action_class === null) {
+				throw new Exception(_('Class not found.'));
+			}
+
+			if (!class_exists($action_class)) {
 				throw new Exception(_s('Class %1$s not found for action %2$s.', $action_class, $action_name));
 			}
 
diff --git a/ui/include/classes/graphdraw/CGraphDraw.php b/ui/include/classes/graphdraw/CGraphDraw.php
index ef42dff9f57..52107270fdd 100644
--- a/ui/include/classes/graphdraw/CGraphDraw.php
+++ b/ui/include/classes/graphdraw/CGraphDraw.php
@@ -124,13 +124,9 @@ abstract class CGraphDraw {
 
 		// i should rename no alpha to alpha at some point to get rid of some confusion
 		foreach ($this->colorsrgb as $name => $RGBA) {
-			if (isset($RGBA[3]) && function_exists('imagecolorexactalpha')
-					&& function_exists('imagecreatetruecolor') && @imagecreatetruecolor(1, 1)) {
-				$this->colors[$name] = imagecolorexactalpha($this->im, $RGBA[0], $RGBA[1], $RGBA[2], $RGBA[3]);
-			}
-			else {
-				$this->colors[$name] = imagecolorallocate($this->im, $RGBA[0], $RGBA[1], $RGBA[2]);
-			}
+			$this->colors[$name] = array_key_exists(3, $RGBA)
+				? imagecolorexactalpha($this->im, $RGBA[0], $RGBA[1], $RGBA[2], $RGBA[3])
+				: imagecolorallocate($this->im, $RGBA[0], $RGBA[1], $RGBA[2]);
 		}
 	}
 
@@ -259,7 +255,7 @@ abstract class CGraphDraw {
 		return get_color($this->im, $color, $alfa);
 	}
 
-	public function getShadow($color, $alfa = 0) {
+	public function getShadow($color, $alpha = 0) {
 		if (isset($this->colorsrgb[$color])) {
 			$red = $this->colorsrgb[$color][0];
 			$green = $this->colorsrgb[$color][1];
@@ -270,16 +266,15 @@ abstract class CGraphDraw {
 		}
 
 		if ($this->sum > 0) {
-			$red = (int)($red * 0.6);
-			$green = (int)($green * 0.6);
-			$blue = (int)($blue * 0.6);
+			$red = (int) ($red * 0.6);
+			$green = (int) ($green * 0.6);
+			$blue = (int) ($blue * 0.6);
 		}
 
 		$RGB = [$red, $green, $blue];
 
-		if (isset($alfa) && function_exists('imagecolorexactalpha') && function_exists('imagecreatetruecolor')
-				&& @imagecreatetruecolor(1, 1)) {
-			return imagecolorexactalpha($this->im, $RGB[0], $RGB[1], $RGB[2], $alfa);
+		if ($alpha != 0) {
+			return imagecolorexactalpha($this->im, $RGB[0], $RGB[1], $RGB[2], $alpha);
 		}
 
 		return imagecolorallocate($this->im, $RGB[0], $RGB[1], $RGB[2]);
diff --git a/ui/include/classes/graphdraw/CLineGraphDraw.php b/ui/include/classes/graphdraw/CLineGraphDraw.php
index 4b9df8f15b5..a4988b1e782 100644
--- a/ui/include/classes/graphdraw/CLineGraphDraw.php
+++ b/ui/include/classes/graphdraw/CLineGraphDraw.php
@@ -722,16 +722,17 @@ class CLineGraphDraw extends CGraphDraw {
 				$gbColor
 			);
 
-			imagefilledpolygon(
-				$this->im,
-				[
-					$this->shiftXleft + $this->shiftXCaption - 3, $this->shiftY - 5,
-					$this->shiftXleft + $this->shiftXCaption + 3, $this->shiftY - 5,
-					$this->shiftXleft + $this->shiftXCaption, $this->shiftY - 10
-				],
-				3,
-				$this->getColor('White')
-			);
+			$points = [
+				$this->shiftXleft + $this->shiftXCaption - 3, $this->shiftY - 5,
+				$this->shiftXleft + $this->shiftXCaption + 3, $this->shiftY - 5,
+				$this->shiftXleft + $this->shiftXCaption, $this->shiftY - 10
+			];
+			if (PHP_VERSION_ID >= 80100) {
+				imagefilledpolygon($this->im, $points, $this->getColor('White'));
+			}
+			else {
+				imagefilledpolygon($this->im, $points, 3, $this->getColor('White'));
+			}
 
 			/* draw left axis triangle */
 			zbx_imageline($this->im, $this->shiftXleft + $this->shiftXCaption - 3, $this->shiftY - 5,
@@ -765,16 +766,17 @@ class CLineGraphDraw extends CGraphDraw {
 				$gbColor
 			);
 
-			imagefilledpolygon(
-				$this->im,
-				[
-					$this->sizeX + $this->shiftXleft + $this->shiftXCaption - 3, $this->shiftY - 5,
-					$this->sizeX + $this->shiftXleft + $this->shiftXCaption + 3, $this->shiftY - 5,
-					$this->sizeX + $this->shiftXleft + $this->shiftXCaption, $this->shiftY - 10
-				],
-				3,
-				$this->getColor('White')
-			);
+			$points = [
+				$this->sizeX + $this->shiftXleft + $this->shiftXCaption - 3, $this->shiftY - 5,
+				$this->sizeX + $this->shiftXleft + $this->shiftXCaption + 3, $this->shiftY - 5,
+				$this->sizeX + $this->shiftXleft + $this->shiftXCaption, $this->shiftY - 10
+			];
+			if (PHP_VERSION_ID >= 80100) {
+				imagefilledpolygon($this->im, $points, $this->getColor('White'));
+			}
+			else {
+				imagefilledpolygon($this->im, $points, 3, $this->getColor('White'));
+			}
 
 			/* draw right axis triangle */
 			zbx_imageline($this->im, $this->sizeX + $this->shiftXleft + $this->shiftXCaption - 3, $this->shiftY - 5,
@@ -807,16 +809,17 @@ class CLineGraphDraw extends CGraphDraw {
 			$gbColor
 		);
 
-		imagefilledpolygon(
-			$this->im,
-			[
-				$this->sizeX + $this->shiftXleft + $this->shiftXCaption + 5, $this->sizeY + $this->shiftY - 2,
-				$this->sizeX + $this->shiftXleft + $this->shiftXCaption + 5, $this->sizeY + $this->shiftY + 4,
-				$this->sizeX + $this->shiftXleft + $this->shiftXCaption + 10, $this->sizeY + $this->shiftY + 1
-			],
-			3,
-			$this->getColor('White')
-		);
+		$points = [
+			$this->sizeX + $this->shiftXleft + $this->shiftXCaption + 5, $this->sizeY + $this->shiftY - 2,
+			$this->sizeX + $this->shiftXleft + $this->shiftXCaption + 5, $this->sizeY + $this->shiftY + 4,
+			$this->sizeX + $this->shiftXleft + $this->shiftXCaption + 10, $this->sizeY + $this->shiftY + 1
+		];
+		if (PHP_VERSION_ID >= 80100) {
+			imagefilledpolygon($this->im, $points, $this->getColor('White'));
+		}
+		else {
+			imagefilledpolygon($this->im, $points, 3, $this->getColor('White'));
+		}
 
 		/* draw X axis triangle */
 		zbx_imageline($this->im, $this->sizeX + $this->shiftXleft + $this->shiftXCaption + 5, $this->sizeY + $this->shiftY - 2,
@@ -1392,13 +1395,7 @@ class CLineGraphDraw extends CGraphDraw {
 			}
 
 			// draw color square
-			if (function_exists('imagecolorexactalpha') && function_exists('imagecreatetruecolor') && @imagecreatetruecolor(1, 1)) {
-				$colorSquare = imagecreatetruecolor(11, 11);
-			}
-			else {
-				$colorSquare = imagecreate(11, 11);
-			}
-
+			$colorSquare = imagecreatetruecolor(11, 11);
 			imagefill($colorSquare, 0, 0, $this->getColor($this->graphtheme['backgroundcolor'], 0));
 			imagefilledrectangle($colorSquare, 0, 0, 10, 10, $color);
 			imagerectangle($colorSquare, 0, 0, 10, 10, $this->getColor('Black'));
@@ -1512,27 +1509,30 @@ class CLineGraphDraw extends CGraphDraw {
 						? $this->graphtheme['leftpercentilecolor']
 						: $this->graphtheme['rightpercentilecolor'];
 
-					imagefilledpolygon(
-						$this->im,
-						[
-							$leftXShift + 5, $this->sizeY + $this->shiftY + 14 * $rowNum + self::LEGEND_OFFSET_Y,
-							$leftXShift - 5, $this->sizeY + $this->shiftY + 14 * $rowNum + self::LEGEND_OFFSET_Y,
-							$leftXShift, $this->sizeY + $this->shiftY + 14 * $rowNum + self::LEGEND_OFFSET_Y - 10
-						],
-						3,
-						$this->getColor($color)
-					);
+					$points = [
+						$leftXShift + 5, $this->sizeY + $this->shiftY + 14 * $rowNum + self::LEGEND_OFFSET_Y,
+						$leftXShift - 5, $this->sizeY + $this->shiftY + 14 * $rowNum + self::LEGEND_OFFSET_Y,
+						$leftXShift, $this->sizeY + $this->shiftY + 14 * $rowNum + self::LEGEND_OFFSET_Y - 10
+					];
+					if (PHP_VERSION_ID >= 80100) {
+						imagefilledpolygon($this->im, $points, $this->getColor($color));
+					}
+					else {
+						imagefilledpolygon($this->im, $points, 3, $this->getColor($color));
+					}
+
+					$points = [
+						$leftXShift + 5, $this->sizeY + $this->shiftY + 14 * $rowNum + self::LEGEND_OFFSET_Y,
+						$leftXShift - 5, $this->sizeY + $this->shiftY + 14 * $rowNum + self::LEGEND_OFFSET_Y,
+						$leftXShift, $this->sizeY + $this->shiftY + 14 * $rowNum + self::LEGEND_OFFSET_Y - 10
+					];
+					if (PHP_VERSION_ID >= 80100) {
+						imagepolygon($this->im, $points, $this->getColor('Black No Alpha'));
+					}
+					else {
+						imagepolygon($this->im, $points, 3, $this->getColor('Black No Alpha'));
+					}
 
-					imagepolygon(
-						$this->im,
-						[
-							$leftXShift + 5, $this->sizeY + $this->shiftY + 14 * $rowNum + self::LEGEND_OFFSET_Y,
-							$leftXShift - 5, $this->sizeY + $this->shiftY + 14 * $rowNum + self::LEGEND_OFFSET_Y,
-							$leftXShift, $this->sizeY + $this->shiftY + 14 * $rowNum + self::LEGEND_OFFSET_Y - 10
-						],
-						3,
-						$this->getColor('Black No Alpha')
-					);
 					$rowNum++;
 				}
 			}
@@ -1647,14 +1647,14 @@ class CLineGraphDraw extends CGraphDraw {
 		$x1 = $from + $this->shiftXleft - 1;
 		$x2 = $to + $this->shiftXleft;
 
-		$y1min = $zero - ($min_from - $oxy) / $unit2px;
-		$y2min = $zero - ($min_to - $oxy) / $unit2px;
+		$y1min = (int) round($zero - ($min_from - $oxy) / $unit2px);
+		$y2min = (int) round($zero - ($min_to - $oxy) / $unit2px);
 
-		$y1max = $zero - ($max_from - $oxy) / $unit2px;
-		$y2max = $zero - ($max_to - $oxy) / $unit2px;
+		$y1max = (int) round($zero - ($max_from - $oxy) / $unit2px);
+		$y2max = (int) round($zero - ($max_to - $oxy) / $unit2px);
 
-		$y1avg = $zero - ($avg_from - $oxy) / $unit2px;
-		$y2avg = $zero - ($avg_to - $oxy) / $unit2px;
+		$y1avg = (int) round($zero - ($avg_from - $oxy) / $unit2px);
+		$y2avg = (int) round($zero - ($avg_to - $oxy) / $unit2px);
 
 		switch ($calc_fnc) {
 			case CALC_FNC_MAX:
@@ -1734,7 +1734,13 @@ class CLineGraphDraw extends CGraphDraw {
 				$style = $drawtype == GRAPH_ITEM_DRAWTYPE_BOLD_LINE ? LINE_TYPE_BOLD : LINE_TYPE_NORMAL;
 
 				if ($calc_fnc == CALC_FNC_ALL) {
-					imagefilledpolygon($this->im, $a, 4, $minmax_color);
+					if (PHP_VERSION_ID >= 80100) {
+						imagefilledpolygon($this->im, $a, $avg_color);
+					}
+					else {
+						imagefilledpolygon($this->im, $a, 4, $minmax_color);
+					}
+
 					if (!$y1x || !$y2x) {
 						zbx_imagealine($this->im, $x1, $y1max, $x2, $y2max, $max_color, $style);
 					}
@@ -1755,15 +1761,8 @@ class CLineGraphDraw extends CGraphDraw {
 				break;
 
 			case GRAPH_ITEM_DRAWTYPE_DASHED_LINE:
-				if (function_exists('imagesetstyle')) {
-					// use imagesetstyle+imageline instead of bugged imagedashedline
-					$style = [$avg_color, $avg_color, IMG_COLOR_TRANSPARENT, IMG_COLOR_TRANSPARENT];
-					imagesetstyle($this->im, $style);
-					zbx_imageline($this->im, $x1, $y1, $x2, $y2, IMG_COLOR_STYLED);
-				}
-				else {
-					imagedashedline($this->im, $x1, $y1, $x2, $y2, $avg_color);
-				}
+				imagesetstyle($this->im, [$avg_color, $avg_color, IMG_COLOR_TRANSPARENT, IMG_COLOR_TRANSPARENT]);
+				zbx_imageline($this->im, $x1, $y1, $x2, $y2, IMG_COLOR_STYLED);
 				break;
 
 			case GRAPH_ITEM_DRAWTYPE_GRADIENT_LINE:
@@ -1784,7 +1783,12 @@ class CLineGraphDraw extends CGraphDraw {
 					$a[6] = $x2;
 					$a[7] = $y2;
 
-					imagefilledpolygon($this->im, $a, 4, $avg_color);
+					if (PHP_VERSION_ID >= 80100) {
+						imagefilledpolygon($this->im, $a, $avg_color);
+					}
+					else {
+						imagefilledpolygon($this->im, $a, 4, $avg_color);
+					}
 				}
 				else {
 					imageLine($this->im, $x1, $y1, $x2, $y2, $avg_color); // draw the initial line
@@ -1817,15 +1821,12 @@ class CLineGraphDraw extends CGraphDraw {
 						$steps = $this->sizeY + $this->shiftY - $gy + 1;
 
 						for ($j = 0; $j < $steps; $j++) {
-							if (($gy + $j) < ($this->shiftY + $startAlpha)) {
-								$alpha = 0;
-							}
-							else {
-								$alpha = 127 - abs(127 - ($alphaRatio * ($gy + $j - $this->shiftY - $startAlpha)));
-							}
+							$alpha = ($gy + $j) < ($this->shiftY + $startAlpha)
+								? 0
+								: 127 - (int) abs(127 - ($alphaRatio * ($gy + $j - $this->shiftY - $startAlpha)));
 
 							$color = imagecolorexactalpha($this->im, $red, $green, $blue, $alpha);
-							imagesetpixel($this->im, $x2 + $i, $gy + $j, $color);
+							imagesetpixel($this->im, $x2 + $i, (int) $gy + $j, $color);
 						}
 					}
 				}
@@ -2040,14 +2041,7 @@ class CLineGraphDraw extends CGraphDraw {
 		$this->selectTriggers();
 		$this->calcDimensions();
 
-		if (function_exists('imagecolorexactalpha') && function_exists('imagecreatetruecolor')
-				&& @imagecreatetruecolor(1, 1)
-		) {
-			$this->im = imagecreatetruecolor(1, 1);
-		}
-		else {
-			$this->im = imagecreate(1, 1);
-		}
+		$this->im = imagecreatetruecolor(1, 1);
 
 		$this->initColors();
 
@@ -2077,13 +2071,7 @@ class CLineGraphDraw extends CGraphDraw {
 		$this->calcPercentile();
 		$this->calcZero();
 
-		if (function_exists('imagecolorexactalpha') && function_exists('imagecreatetruecolor')
-				&& @imagecreatetruecolor(1, 1)) {
-			$this->im = imagecreatetruecolor($this->fullSizeX, $this->fullSizeY);
-		}
-		else {
-			$this->im = imagecreate($this->fullSizeX, $this->fullSizeY);
-		}
+		$this->im = imagecreatetruecolor($this->fullSizeX, $this->fullSizeY);
 
 		$this->initColors();
 		$this->drawRectangle();
diff --git a/ui/include/classes/graphdraw/CPieGraphDraw.php b/ui/include/classes/graphdraw/CPieGraphDraw.php
index ab7557d9bf1..c69ad86fc4c 100644
--- a/ui/include/classes/graphdraw/CPieGraphDraw.php
+++ b/ui/include/classes/graphdraw/CPieGraphDraw.php
@@ -86,22 +86,24 @@ class CPieGraphDraw extends CGraphDraw {
 		$count *= $this->exploderad;
 		$anglemid = (int) (($anglestart + $angleend) / 2);
 
-		$y+= round($count * sin(deg2rad($anglemid)));
-		$x+= round($count * cos(deg2rad($anglemid)));
+		$y += round($count * sin(deg2rad($anglemid)));
+		$x += round($count * cos(deg2rad($anglemid)));
 
-		return [$x, $y];
+		return [(int) $x, (int) $y];
 	}
 
 	protected function calcExplodedRadius($sizeX, $sizeY, $count) {
 		$count *= $this->exploderad * 2;
 		$sizeX -= $count;
 		$sizeY -= $count;
-		return [$sizeX, $sizeY];
+
+		return [(int) $sizeX, (int) $sizeY];
 	}
 
 	protected function calc3DAngle($sizeX, $sizeY) {
 		$sizeY *= GRAPH_3D_ANGLE / 90;
-		return [$sizeX, round($sizeY)];
+
+		return [$sizeX, (int) round($sizeY)];
 	}
 
 	protected function selectData() {
@@ -432,8 +434,8 @@ class CPieGraphDraw extends CGraphDraw {
 			list($sizeX, $sizeY) = $this->calcExplodedRadius($sizeX, $sizeY, count($values));
 		}
 
-		$xc = $x = (int) $this->sizeX / 2 + $this->shiftXleft;
-		$yc = $y = (int) $this->sizeY / 2 + $this->shiftY;
+		$xc = $x = (int) ($this->sizeX / 2) + $this->shiftXleft;
+		$yc = $y = (int) ($this->sizeY / 2) + $this->shiftY;
 
 		$anglestart = 0;
 		$angleend = 0;
@@ -513,8 +515,8 @@ class CPieGraphDraw extends CGraphDraw {
 
 		list($sizeX, $sizeY) = $this->calc3DAngle($sizeX, $sizeY);
 
-		$xc = $x = (int) $this->sizeX / 2 + $this->shiftXleft;
-		$yc = $y = (int) $this->sizeY / 2 + $this->shiftY;
+		$xc = $x = (int) ($this->sizeX / 2) + $this->shiftXleft;
+		$yc = $y = (int) ($this->sizeY / 2) + $this->shiftY;
 
 		// bottom angle line
 		$anglestart = 0;
@@ -701,12 +703,8 @@ class CPieGraphDraw extends CGraphDraw {
 		$this->exploderad = (int) $this->sizeX / 100;
 		$this->exploderad3d = (int) $this->sizeX / 60;
 
-		if (function_exists('ImageColorExactAlpha') && function_exists('ImageCreateTrueColor') && @imagecreatetruecolor(1, 1)) {
-			$this->im = imagecreatetruecolor($this->fullSizeX, $this->fullSizeY);
-		}
-		else {
-			$this->im = imagecreate($this->fullSizeX, $this->fullSizeY);
-		}
+		$this->im = imagecreatetruecolor($this->fullSizeX, $this->fullSizeY);
+
 		$this->initColors();
 		$this->drawRectangle();
 		$this->drawHeader();
diff --git a/ui/include/classes/validators/CApiInputValidator.php b/ui/include/classes/validators/CApiInputValidator.php
index 17827dcce9b..ab69f47c5a3 100644
--- a/ui/include/classes/validators/CApiInputValidator.php
+++ b/ui/include/classes/validators/CApiInputValidator.php
@@ -2554,14 +2554,14 @@ class CApiInputValidator {
 			return true;
 		}
 
-		[$year, $month, $day] = sscanf($data, '%d-%d-%d');
+		$date = DateTime::createFromFormat(ZBX_DATE, $data);
 
-		if (!checkdate($month, $day, $year)) {
+		if (!$date || $date->format(ZBX_DATE) !== $data) {
 			$error = _s('Invalid parameter "%1$s": %2$s.', $path, _('a date in YYYY-MM-DD format is expected'));
 			return false;
 		}
 
-		if (!validateDateInterval($year, $month, $day)) {
+		if (!validateDateInterval($date->format('Y'), $date->format('m'), $date->format('d'))) {
 			$error = _s('Invalid parameter "%1$s": %2$s.', $path,
 				_s('value must be between "%1$s" and "%2$s"', '1970-01-01', '2038-01-18')
 			);
diff --git a/ui/include/draw.inc.php b/ui/include/draw.inc.php
index 2fb972d71a7..2590dcfe664 100644
--- a/ui/include/draw.inc.php
+++ b/ui/include/draw.inc.php
@@ -27,14 +27,14 @@
  * @param   array     $fgColor    foreground color, array of RGB
  * @param   float     $alpha      transparency index in range of 0-1, 1 returns unchanged fgColor color
  *
- * @return  array                 new color
+ * @return int  A color index.
  */
 function zbx_colormix($image, $bgColor, $fgColor, $alpha) {
 	$r = $bgColor[0] + ($fgColor[0] - $bgColor[0]) * $alpha;
 	$g = $bgColor[1] + ($fgColor[1] - $bgColor[1]) * $alpha;
 	$b = $bgColor[2] + ($fgColor[2] - $bgColor[2]) * $alpha;
 
-	return imagecolorresolvealpha($image, $r, $g, $b, 0);
+	return imagecolorresolvealpha($image, (int) $r, (int) $g, (int) $b, 0);
 }
 
 /**
diff --git a/ui/include/func.inc.php b/ui/include/func.inc.php
index 25289064bd1..99176b386fe 100644
--- a/ui/include/func.inc.php
+++ b/ui/include/func.inc.php
@@ -2231,19 +2231,14 @@ function splitPath($path) {
  * @param string   $color  a hexadecimal color identifier like "1F2C33"
  * @param int      $alpha
  *
- * @return int|false
+ * @return int
  */
 function get_color($image, $color, $alpha = 0) {
 	$red = hexdec('0x'.substr($color, 0, 2));
 	$green = hexdec('0x'.substr($color, 2, 2));
 	$blue = hexdec('0x'.substr($color, 4, 2));
 
-	if (function_exists('imagecolorexactalpha') && function_exists('imagecreatetruecolor')
-			&& @imagecreatetruecolor(1, 1)) {
-		return imagecolorexactalpha($image, $red, $green, $blue, $alpha);
-	}
-
-	return imagecolorallocate($image, $red, $green, $blue);
+	return imagecolorexactalpha($image, $red, $green, $blue, $alpha);
 }
 
 /**
diff --git a/ui/include/graphs.inc.php b/ui/include/graphs.inc.php
index 987f4981eec..dec27508bb7 100644
--- a/ui/include/graphs.inc.php
+++ b/ui/include/graphs.inc.php
@@ -532,12 +532,15 @@ function get_next_color($palettetype = 0) {
  * @param resource 	$image
  * @param int		$fontsize
  * @param int 		$angle
- * @param int		$x
- * @param int 		$y
+ * @param int|float $x
+ * @param int|float $y
  * @param int		$color		a numeric color identifier from imagecolorallocate() or imagecolorallocatealpha()
  * @param string	$string
  */
 function imageText($image, $fontsize, $angle, $x, $y, $color, $string) {
+	$x = (int) $x;
+	$y = (int) $y;
+
 	if ((preg_match(ZBX_PREG_DEF_FONT_STRING, $string) && $angle != 0) || ZBX_FONT_NAME == ZBX_GRAPH_FONT_NAME) {
 		$ttf = ZBX_FONTPATH.'/'.ZBX_FONT_NAME.'.ttf';
 		imagettftext($image, $fontsize, $angle, $x, $y, $color, $ttf, $string);
diff --git a/ui/include/images.inc.php b/ui/include/images.inc.php
index 6dcb93c5306..599c92d8e5c 100644
--- a/ui/include/images.inc.php
+++ b/ui/include/images.inc.php
@@ -75,12 +75,10 @@ function imageThumb($source, $thumbWidth = 0, $thumbHeight = 0) {
 			}
 		}
 
-		if (function_exists('imagecreatetruecolor') && @imagecreatetruecolor(1, 1)) {
-			$thumb = imagecreatetruecolor($thumbWidth, $thumbHeight);
-		}
-		else {
-			$thumb = imagecreate($thumbWidth, $thumbHeight);
-		}
+		$thumbWidth = (int) round($thumbWidth);
+		$thumbHeight = (int) round($thumbHeight);
+
+		$thumb = imagecreatetruecolor($thumbWidth, $thumbHeight);
 
 		// preserve png transparency
 		imagealphablending($thumb, false);
@@ -91,11 +89,13 @@ function imageThumb($source, $thumbWidth = 0, $thumbHeight = 0) {
 			0, 0,
 			0, 0,
 			$thumbWidth, $thumbHeight,
-			$srcWidth, $srcHeight);
+			$srcWidth, $srcHeight
+		);
 
 		imagedestroy($source);
 		$source = $thumb;
 	}
+
 	return $source;
 }
 
diff --git a/ui/include/views/js/monitoring.sysmaps.js.php b/ui/include/views/js/monitoring.sysmaps.js.php
index f929a4cc364..00712c93eb2 100644
--- a/ui/include/views/js/monitoring.sysmaps.js.php
+++ b/ui/include/views/js/monitoring.sysmaps.js.php
@@ -127,7 +127,7 @@ function createFontSelect(string $name): CSelect {
 							->setId('areaSizeHeight')
 					], 'areaSizeRow')
 					->addRow(_('Placing algorithm'),
-						(new CRadioButtonList(null, SYSMAP_ELEMENT_AREA_VIEWTYPE_GRID))
+						(new CRadioButtonList('viewtype', SYSMAP_ELEMENT_AREA_VIEWTYPE_GRID))
 							->addValue(_('Grid'), SYSMAP_ELEMENT_AREA_VIEWTYPE_GRID)
 							->setModern(true),
 						'areaPlacingRow'
diff --git a/ui/tests/selenium/testPageAdministrationGeneralModules.php b/ui/tests/selenium/testPageAdministrationGeneralModules.php
index e81b8a32477..fd504126a4e 100644
--- a/ui/tests/selenium/testPageAdministrationGeneralModules.php
+++ b/ui/tests/selenium/testPageAdministrationGeneralModules.php
@@ -582,7 +582,7 @@ class testPageAdministrationGeneralModules extends CWebTest {
 			if (CTestArrayHelper::get($entry, 'check_disabled', true)) {
 				$this->page->open('zabbix.php?action='.$entry['action'])->waitUntilReady();
 				$message = CMessageElement::find()->one();
-				$this->assertStringContainsString('Class not found for action '.$entry['action'], $message->getText());
+				$this->assertStringContainsString('Class not found', $message->getText());
 				$this->page->open('zabbix.php?action=module.list');
 			}
 		}