diff --git a/Business/Finance/Forecasting/ExponentialSmoothing/ExponentialSmoothing.php b/Business/Finance/Forecasting/ExponentialSmoothing/ExponentialSmoothing.php
index c2f82e97b..29d5c78d8 100644
--- a/Business/Finance/Forecasting/ExponentialSmoothing/ExponentialSmoothing.php
+++ b/Business/Finance/Forecasting/ExponentialSmoothing/ExponentialSmoothing.php
@@ -122,7 +122,7 @@ class ExponentialSmoothing
         }
 
         $sum = 0;
-        for($i = 0; $i < $length; $i++) {
+        for ($i = 0; $i < $length; $i++) {
             $sum += pow($damping, $i);
         }
 
@@ -140,7 +140,7 @@ class ExponentialSmoothing
             $error      = [];
             $tempForecast = [];
 
-            for($i = 1; $i < $dataLength; $i++) {
+            for ($i = 1; $i < $dataLength; $i++) {
                 $level[$i] = $alpha * ($i < $dataLength - $future ? $this->data[$i-1] : $tempForecast[$i-1]) + (1 - $alpha) * $level[$i-1];
 
                 $tempForecast[$i] = $level[$i];
@@ -172,7 +172,7 @@ class ExponentialSmoothing
         $forecast = [];
         $seasonal = [];
 
-        for($i = 1; $i < $cycle+1; $i++) {
+        for ($i = 1; $i < $cycle+1; $i++) {
             $seasonal[$i] = $this->data[$i-1] - $level[0];
         }
 
@@ -185,7 +185,7 @@ class ExponentialSmoothing
                 $error      = [];
                 $tempForecast = [];
 
-                for($i = 1; $i < $dataLength; $i++) {
+                for ($i = 1; $i < $dataLength; $i++) {
                     $hm = (int) floor(($i-1) % $cycle) + 1;
 
                     $level[$i] = $alpha * (($i < $dataLength - $future ? $this->data[$i-1] : $tempForecast[$i-1]) - $seasonal[$i]) + (1 - $alpha) * $level[$i-1];
@@ -223,7 +223,7 @@ class ExponentialSmoothing
         $forecast = [];
         $seasonal = [];
 
-        for($i = 1; $i < $cycle+1; $i++) {
+        for ($i = 1; $i < $cycle+1; $i++) {
             $seasonal[$i] = $this->data[$i] / $level[0];
         }
 
@@ -236,7 +236,7 @@ class ExponentialSmoothing
                 $error      = [];
                 $tempForecast = [];
 
-                for($i = 1; $i < $dataLength; $i++) {
+                for ($i = 1; $i < $dataLength; $i++) {
                     $hm = (int) floor(($i-1) % $cycle) + 1;
 
                     $level[$i] = $alpha * (($i < $dataLength - $future ? $this->data[$i-1] : $tempForecast[$i-1]) / $seasonal[$i]) + (1 - $alpha) * $level[$i-1];
@@ -282,7 +282,7 @@ class ExponentialSmoothing
                 $error      = [];
                 $tempForecast = [];
 
-                for($i = 1; $i < $dataLength; $i++) {
+                for ($i = 1; $i < $dataLength; $i++) {
                     $level[$i] = $alpha * ($i < $dataLength - $future ? $this->data[$i-1] : $tempForecast[$i-1]) + (1 - $alpha) * ($level[$i-1] + $damping * $trend[$i-1]);
                     $trend[$i] = $beta * ($level[$i] - $level[$i-1]) + (1 - $beta) * $damping * $trend[$i-1];
 
@@ -320,13 +320,13 @@ class ExponentialSmoothing
         $seasonal = [];
 
         $sum = 0;
-        for($i = 1; $i < $cycle+1; $i++) {
+        for ($i = 1; $i < $cycle+1; $i++) {
             $sum += ($this->data[$cycle] - $this->data[$i]) / $cycle;
         }
 
         $trend[0] *= $sum;
 
-        for($i = 1; $i < $cycle+1; $i++) {
+        for ($i = 1; $i < $cycle+1; $i++) {
             $seasonal[$i] = $this->data[$i-1] - $level[0];
         }
 
@@ -342,7 +342,7 @@ class ExponentialSmoothing
                     $error      = [];
                     $tempForecast = [];
 
-                    for($i = 1; $i < $dataLength; $i++) {
+                    for ($i = 1; $i < $dataLength; $i++) {
                         $hm = (int) floor(($i-1) % $cycle) + 1;
 
                         $level[$i] = $alpha * (($i < $dataLength - $future ? $this->data[$i-1] : $tempForecast[$i-1]) - $seasonal[$i]) + (1 - $alpha) * ($level[$i-1] + $damping * $trend[$i-1]);
@@ -387,13 +387,13 @@ class ExponentialSmoothing
         $gamma_ = $gamma * (1 - $alpha);
 
         $sum = 0;
-        for($i = 1; $i < $cycle+1; $i++) {
+        for ($i = 1; $i < $cycle+1; $i++) {
             $sum += ($this->data[$cycle] - $this->data[$i]) / $cycle;
         }
 
         $trend[0] *= $sum;
 
-        for($i = 1; $i < $cycle+1; $i++) {
+        for ($i = 1; $i < $cycle+1; $i++) {
             $seasonal[$i] = $this->data[$i] / $level[0];
         }
 
@@ -409,7 +409,7 @@ class ExponentialSmoothing
                     $error      = [];
                     $tempForecast = [];
 
-                    for($i = 1; $i < $dataLength; $i++) {
+                    for ($i = 1; $i < $dataLength; $i++) {
                         $hm = (int) floor(($i-1) % $cycle) + 1;
 
                         $level[$i] = $alpha * (($i < $dataLength - $future ? $this->data[$i-1] : $tempForecast[$i-1]) / $seasonal[$i]) + (1 - $alpha) * ($level[$i-1] + $damping * $trend[$i-1]);
@@ -459,7 +459,7 @@ class ExponentialSmoothing
                 $error      = [];
                 $tempForecast = [];
 
-                for($i = 1; $i < $dataLength; $i++) {
+                for ($i = 1; $i < $dataLength; $i++) {
                     $level[$i] = $alpha * ($i < $dataLength - $future ? $this->data[$i-1] : $tempForecast[$i-1]) + (1 - $alpha) * $level[$i-1] * pow($trend[$i-1], $damping);
                     $trend[$i] = $beta * ($level[$i] / $level[$i-1]) + (1 - $beta) * pow($trend[$i-1], $damping);
 
@@ -496,13 +496,13 @@ class ExponentialSmoothing
         $seasonal = [];
 
         $sum = 0;
-        for($i = 1; $i < $cycle+1; $i++) {
+        for ($i = 1; $i < $cycle+1; $i++) {
             $sum += ($this->data[$cycle] - $this->data[$i]) / $cycle;
         }
 
         $trend[0] *= $sum;
 
-        for($i = 1; $i < $cycle+1; $i++) {
+        for ($i = 1; $i < $cycle+1; $i++) {
             $seasonal[$i] = $this->data[$i-1] - $level[0];
         }
 
@@ -518,7 +518,7 @@ class ExponentialSmoothing
                     $error      = [];
                     $tempForecast = [];
 
-                    for($i = 1; $i < $dataLength; $i++) {
+                    for ($i = 1; $i < $dataLength; $i++) {
                         $hm = (int) floor(($i-1) % $cycle) + 1;
 
                         $level[$i] = $alpha * (($i < $dataLength - $future ? $this->data[$i-1] : $tempForecast[$i-1]) - $seasonal[$i]) + (1 - $alpha) * $level[$i-1] * pow($trend[$i-1], $damping);
@@ -562,13 +562,13 @@ class ExponentialSmoothing
         $seasonal = [];
 
         $sum = 0;
-        for($i = 1; $i < $cycle+1; $i++) {
+        for ($i = 1; $i < $cycle+1; $i++) {
             $sum += ($this->data[$cycle] - $this->data[$i]) / $cycle;
         }
 
         $trend[0] *= $sum;
 
-        for($i = 1; $i < $cycle+1; $i++) {
+        for ($i = 1; $i < $cycle+1; $i++) {
             $seasonal[$i] = $this->data[$i] / $level[0];
         }
 
@@ -584,7 +584,7 @@ class ExponentialSmoothing
                     $error      = [];
                     $tempForecast = [];
 
-                    for($i = 1; $i < $dataLength; $i++) {
+                    for ($i = 1; $i < $dataLength; $i++) {
                         $hm = (int) floor(($i-1) % $cycle) + 1;
 
                         $level[$i] = $alpha * (($i < $dataLength - $future ? $this->data[$i-1] : $tempForecast[$i-1]) / $seasonal[$i]) + (1 - $alpha) * $level[$i-1] * pow($trend[$i-1], $damping);
diff --git a/Business/Sales/MarketShareEstimation.php b/Business/Sales/MarketShareEstimation.php
index 419d5cb8c..0d9af9ccd 100644
--- a/Business/Sales/MarketShareEstimation.php
+++ b/Business/Sales/MarketShareEstimation.php
@@ -44,7 +44,7 @@ class MarketShareEstimation {
     public static function getRankFromMarketShare(int $participants, float $marketShare, float $modifier = 1.0) : int
     {
         $sum = 0.0;
-        for($i = 0; $i < $participants; $i++) {
+        for ($i = 0; $i < $participants; $i++) {
             $sum += 1 / pow($i+1, $modifier);
         }
     
@@ -67,7 +67,7 @@ class MarketShareEstimation {
     public static function getMarketShareFromRank(int $participants, int $rank, float $modifier = 1.0) : float
     {
         $sum = 0.0;
-        for($i = 0; $i < $participants; $i++) {
+        for ($i = 0; $i < $participants; $i++) {
             $sum += 1 / pow($i+1, $modifier);
         }
         
diff --git a/Math/Matrix/CholeskyDecomposition.php b/Math/Matrix/CholeskyDecomposition.php
index 757f4aefd..5941057c4 100644
--- a/Math/Matrix/CholeskyDecomposition.php
+++ b/Math/Matrix/CholeskyDecomposition.php
@@ -28,9 +28,9 @@ class CholeskyDecomposition
         $this->L = $M->toArray();
         $this->m = $M->getM();
 
-        for($i = 0; $i < $this->m; ++$i) {
-            for($j = $i; $j < $this->m; ++$j) {
-                for($sum = $this->L[$i][$j], $k = $i - 1; $k >= 0; --$k) {
+        for ($i = 0; $i < $this->m; ++$i) {
+            for ($j = $i; $j < $this->m; ++$j) {
+                for ($sum = $this->L[$i][$j], $k = $i - 1; $k >= 0; --$k) {
                     $sum -= $this->L[$i][$k] * $this->L[$j][$k];
                 }
                 if ($i == $j) {
diff --git a/Math/Matrix/Matrix.php b/Math/Matrix/Matrix.php
index fa64ecb55..62f780687 100644
--- a/Math/Matrix/Matrix.php
+++ b/Math/Matrix/Matrix.php
@@ -574,7 +574,7 @@ class Matrix implements \ArrayAccess, \Iterator
         $mDim = count($b);
         $matrix = $this->matrix;
 
-        for($col = 0; $col < $mDim; $col++) {
+        for ($col = 0; $col < $mDim; $col++) {
             $j = $col;
             $max = $matrix[$j][$j];
 
diff --git a/Stdlib/Base/SmartDateTime.php b/Stdlib/Base/SmartDateTime.php
index f442a6318..22a0a676d 100644
--- a/Stdlib/Base/SmartDateTime.php
+++ b/Stdlib/Base/SmartDateTime.php
@@ -281,20 +281,20 @@ class SmartDateTime extends \DateTime
         $daysPreviousMonth = $previousMonth->getDaysOfMonth();
         
         // add difference to $weekStartsWith counting backwards from days of previous month (reorder so that lowest value first)
-        for($i = $daysPreviousMonth - $diffToWeekStart; $i < $daysPreviousMonth; $i++) {
+        for ($i = $daysPreviousMonth - $diffToWeekStart; $i < $daysPreviousMonth; $i++) {
             $days[] = new \DateTime($previousMonth->format('Y') . '-' . $previousMonth->format('m') . '-' . ($i+1));
         }
         
         // add normal count of current days
         $daysMonth = $this->getDaysOfMonth();
-        for($i = 1; $i <= $daysMonth; $i++) {
+        for ($i = 1; $i <= $daysMonth; $i++) {
             $days[] = new \DateTime($this->format('Y') . '-' . $this->format('m') . '-' . ($i));
         }
         
         // add remaining days to next month (7*6 - difference+count of current month)
         $remainingDays = 42 - $diffToWeekStart - $daysMonth;
         $nextMonth = $this->createModify(0, 1);
-        for($i = 1; $i <= $remainingDays; $i++) {
+        for ($i = 1; $i <= $remainingDays; $i++) {
             $days[] = new \DateTime($nextMonth->format('Y') . '-' . $nextMonth->format('m') . '-' . ($i));
         }
 
diff --git a/Stdlib/Graph/Tree.php b/Stdlib/Graph/Tree.php
index f4122359f..2b271debc 100644
--- a/Stdlib/Graph/Tree.php
+++ b/Stdlib/Graph/Tree.php
@@ -133,7 +133,7 @@ class Tree extends Graph
     {
         $depth = $this->getMaxDepth();
 
-        for($i = 1; $i < $depth; $i++) {
+        for ($i = 1; $i < $depth; $i++) {
             $nodes = $this->getLevel($i);
             callback($nodes);
         }
diff --git a/Utils/StringUtils.php b/Utils/StringUtils.php
index d3b01b0e4..931e5809f 100644
--- a/Utils/StringUtils.php
+++ b/Utils/StringUtils.php
@@ -384,7 +384,7 @@ class StringUtils
         $l      = mb_strlen($input, 'UTF-8');
         $unique = [];
 
-        for($i = 0; $i < $l; $i++) {
+        for ($i = 0; $i < $l; $i++) {
             $char = mb_substr($input, $i, 1, 'UTF-8');
 
             if (!array_key_exists($char, $unique)) {