diff --git a/arrays_1_multi_dim_max.php b/arrays_1_multi_dim_max.php
index de8c1a5..171b7d7 100644
--- a/arrays_1_multi_dim_max.php
+++ b/arrays_1_multi_dim_max.php
@@ -1,23 +1,37 @@
 <?php
-$aDim = array(87,356,2 => array(4,6,
-                        7 => array(-10,19,256,59,65)
-                        ,8,9,),
-                        3 => array(54,78,95),
-                        6 => array(-7,89,176,55),);
 
-$vMax = array_key_first($aDim);
+$aDim = [
+    87,
+    356,
+    2 => [
+        4,
+        6,
+        7 => [-10, 19, 256, 59, 65,],
+        8,
+        9,
+    ],
+    3 => [54, 78, 95,],
+    6 => [-7, 89, 176, 55,],
+];
 
-function findMax ($arr,&$vMax){
-    foreach ($arr as $item){
-        if (is_array($item)){
-            $vMax = findMax($item,$vMax);
+/**
+ * @param array $arr
+ * @param int $vMax
+ * @return int
+ */
+function findMax(array $arr, int &$vMax): int
+{
+    foreach ($arr as $item) {
+        if (is_array($item)) {
+            $vMax = findMax($item, $vMax);
             continue;
         }
-        if ($item > $vMax){
+        if ($item > $vMax) {
             $vMax = $item;
         }
     }
     return $vMax;
 }
 
-var_dump(findMax($aDim,$vMax));
+$vMax = array_first($aDim);
+var_dump(findMax($aDim, $vMax));
diff --git a/arrays_2_one_dim_filter_non-numeric.php b/arrays_2_one_dim_filter_non-numeric.php
index 1342489..d272660 100644
--- a/arrays_2_one_dim_filter_non-numeric.php
+++ b/arrays_2_one_dim_filter_non-numeric.php
@@ -1,22 +1,42 @@
 <?php
 
-$aDim = array(45,67,2 =>array(4, 6, 3 => array(-10, 19=>array(3,6,90,6),256, "first", 65), 8, 9),5 => array(54, "second", 95),7 => array(-7, "last", 176, 55),);
+$aDim = [
+    45,
+    67,
+    2 => [
+        4,
+        6,
+        3 => [
+            -10,
+            19 => [3, 6, 90, 6],
+            256,
+            "first",
+            65,
+        ],
+        8,
+        9,
+    ],
+    5 => [54, "second", 95,],
+    7 => [-7, "last", 176, 55,],
+];
 
-$linearDim = [];
-
-function get_one_dim_array ($arr, $outDim)
+/**
+ * @param array $arr
+ * @param array $outDim
+ * @return array
+ */
+function getOneDimArray(array $arr, array $outDim = []): array
 {
     foreach ($arr as $item) {
-
         if (is_array($item)) {
-            $outDim = get_one_dim_array($item,$outDim);
+            $outDim = getOneDimArray($item, $outDim);
             continue;
         }
-        elseif (is_numeric($item)){
+        if (is_numeric($item)) {
             $outDim[] = $item;
         }
-
     }
     return $outDim;
 }
-print_r(get_one_dim_array($aDim,$linearDim));
\ No newline at end of file
+
+print_r(getOneDimArray($aDim));
\ No newline at end of file
diff --git a/arrays_3_dim_dissect_median.php b/arrays_3_dim_dissect_median.php
index 43bf97f..9fe07ac 100644
--- a/arrays_3_dim_dissect_median.php
+++ b/arrays_3_dim_dissect_median.php
@@ -1,48 +1,65 @@
 <?php
 
-$aDim = array(45, 67, 2 => array(4, 6, 3 => array(-10, 19 => array(3, 27, 90, 6), 256, "first", 65), 8), 5 => array(54, "second", 95), 7 => array(-7, "last", 176, 55),);
+$aDim = [
+    45,
+    67,
+    2 => [
+        4,
+        6,
+        3 => [
+            -10,
+            19 => [3, 6, 90, 6],
+            256,
+            "first",
+            65,
+        ],
+        8,
+        9,
+    ],
+    5 => [54, "second", 95,],
+    7 => [-7, "last", 176, 55,],
+];
 
-
-
-function get_one_dim_array($arr, $outDim)
+/**
+ * @param array $arr
+ * @param array $outDim
+ * @return array
+ */
+function getOneDimArray(array $arr, array $outDim = []): array
 {
     foreach ($arr as $item) {
-
         if (is_array($item)) {
-            $outDim = get_one_dim_array($item, $outDim);
+            $outDim = getOneDimArray($item, $outDim);
             continue;
-        } elseif (is_numeric($item)) {
+        }
+        if (is_numeric($item)) {
             $outDim[] = $item;
         }
-
     }
     return $outDim;
 }
 
-$linearDim = [];
-
-$linearDim = get_one_dim_array($aDim, $linearDim);
-sort($linearDim,SORT_NUMERIC);
-$numEls =count($linearDim);
+$linearDim = getOneDimArray($aDim);
+sort($linearDim, SORT_NUMERIC);
+$numEls = count($linearDim);
 print_r($linearDim);
 
-// Четное число элементов массива, медиана равна полусумме двух средних соседних значений
-if (!($numEls%2)){
-    $median = ($linearDim[$numEls/2]+$linearDim[$numEls/2-1])/2;
+if (!($numEls % 2)) {
+    // Четное число элементов массива, медиана равна полусумме двух средних соседних значений
+    $median = ($linearDim[$numEls / 2] + $linearDim[$numEls / 2 - 1]) / 2;
     echo "Odd quantity";
-}
-// Нечетное число элементов массива, медиана равна значению среднего элемента массива
-else{
-    $median = $linearDim[$numEls/2+1];
+} else {
+    // Нечетное число элементов массива, медиана равна значению среднего элемента массива
+    $median = $linearDim[$numEls / 2 + 1];
 }
 print_r($median);
 
-$lessTwo_times = array_search($median/2,$linearDim);
-$moreTwo_times = array_search($median*2,$linearDim);
+$lessTwoTimes = array_search($median / 2, $linearDim);
+$moreTwoTimes = array_search($median * 2, $linearDim);
 
-var_dump($lessTwo_times);
-var_dump($moreTwo_times);
+var_dump($lessTwoTimes);
+var_dump($moreTwoTimes);
 
-$linearDim = array_splice($linearDim,$lessTwo_times+1);
+$linearDim = array_splice($linearDim, $lessTwoTimes + 1);
 
 print_r($linearDim);
diff --git a/strings_1_sort_by_ABC.php b/strings_1_sort_by_ABC.php
index b032457..fdfa3ef 100644
--- a/strings_1_sort_by_ABC.php
+++ b/strings_1_sort_by_ABC.php
@@ -1,11 +1,10 @@
 <?php
 
 // Первый вариант
-
-$unOrd = array("yard","Festival", "lorem", "ipsum", "mountain", "serpent");
+$unOrd = ["yard", "Festival", "lorem", "ipsum", "mountain", "serpent"];
 $sorted = [];
 
-foreach ($unOrd as $word){
+foreach ($unOrd as $word) {
     $key = ord($word[0]);
     $sorted[$key] = $word;
 }
@@ -14,6 +13,5 @@
 print_r($sorted);
 
 //Второй вариант
-
-//sort($unOrd)
-//print_r($unOrd);
\ No newline at end of file
+sort($unOrd);
+print_r($unOrd);
\ No newline at end of file
diff --git a/strings_2_del_repeated.php b/strings_2_del_repeated.php
index f573dff..4b9fe90 100644
--- a/strings_2_del_repeated.php
+++ b/strings_2_del_repeated.php
@@ -1,11 +1,11 @@
 <?php
+
 $gibberish = "AAbBbbCcCcAAa";
 
 $letter = 0;
-
-while ($letter < strlen($gibberish)){
+while ($letter < strlen($gibberish)) {
     $subst = $gibberish[$letter];
-    $gibberish = preg_replace("/$subst+/","$subst",$gibberish);
+    $gibberish = preg_replace("/" . quotemeta($subst) . "+/", $subst, $gibberish);
 //    $gibberish = preg_replace("/$subst+/i","$subst",$gibberish); //Регистронезависимый вариант
     $letter++;
 }
diff --git a/sum_less_three_optimized.php b/sum_less_three_optimized.php
index 08a080c..c3a1e81 100644
--- a/sum_less_three_optimized.php
+++ b/sum_less_three_optimized.php
@@ -1,19 +1,14 @@
 <?php
-//echo 'Введите число: '
 
 $aNum = 9;
-$aStart = 0;
 
-if (!($aNum%3)){
-    $aStart = $aNum - 3;
-}
-else{
-    $aStart = $aNum-($aNum%3);
+$aStart = $aNum - 3;
+if ($aNum % 3) {
+    $aStart = $aNum - ($aNum % 3);
 }
 
 $sumThree = 0;
-
-for($i = $aStart;$i >= 3; $i -=3) {
+for ($i = $aStart; $i >= 3; $i -= 3) {
     $sumThree += $i;
 }