Convert six variable assignments to the usage of combined operators

[elfring]

👀 Some source code analysis tools can help to find opportunities for improving software components.
💭 I propose to increase the usage of combined operators accordingly.

diff --git a/User_class.php b/User_class.php
index b9c8fc7..86386df 100644
--- a/User_class.php
+++ b/User_class.php
@@ -446,13 +446,13 @@ if (!defined('User_class')) {
                 foreach ($result as $row) {
                     $dept = $row['dept_id'];
                     if ($index != $num_depts -1) {
-                        $query = $query . " department = :dept OR ";
+                        $query .= " department = :dept OR ";
                     } else {
-                        $query = $query . " department = :dept )";
+                        $query .= " department = :dept )";
                     }
                     $index++;
                 }
-                $query = $query . " AND publishable = 0";
+                $query .= " AND publishable = 0";
 
                 $stmt = $this->connection->prepare($query);
                 $stmt->execute(array(':dept' => $dept));
diff --git a/functions.php b/functions.php
index 9d81b2f..875b43d 100644
--- a/functions.php
+++ b/functions.php
@@ -603,7 +603,7 @@ function makeRandomPassword()
     while ($i <= 7) {
         $num = rand() % 33;
         $tmp = substr($salt, $num, 1);
-        $pass = $pass . $tmp;
+        $pass .= $tmp;
         $i++;
     }
     return $pass;
diff --git a/vendor/symfony/console/Helper/Table.php b/vendor/symfony/console/Helper/Table.php
index 1f103ad..4a6ca68 100644
--- a/vendor/symfony/console/Helper/Table.php
+++ b/vendor/symfony/console/Helper/Table.php
@@ -601,7 +601,7 @@ class Table
             $cellWidth = Helper::strlenWithoutDecoration($this->output->getFormatter(), $cell);
             if ($cell instanceof TableCell && $cell->getColspan() > 1) {
                 // we assume that cell value will be across more than one column.
-                $cellWidth = $cellWidth / $cell->getColspan();
+                $cellWidth /= $cell->getColspan();
             }
 
             return $cellWidth;
diff --git a/vendor/symfony/console/Input/InputDefinition.php b/vendor/symfony/console/Input/InputDefinition.php
index bd64163..fcc8ec3 100644
--- a/vendor/symfony/console/Input/InputDefinition.php
+++ b/vendor/symfony/console/Input/InputDefinition.php
@@ -399,7 +399,7 @@ class InputDefinition
             if (!$argument->isRequired()) {
                 $element = '['.$element.']';
             } elseif ($argument->isArray()) {
-                $element = $element.' ('.$element.')';
+                $element .=' ('.$element.')';
             }
 
             if ($argument->isArray()) {