diff --git a/rector.php b/rector.php
index b5c0cc63b29b..50248202373a 100644
--- a/rector.php
+++ b/rector.php
@@ -13,10 +13,9 @@
 
 use Rector\Caching\ValueObject\Storage\FileCacheStorage;
 use Rector\CodeQuality\Rector\Empty_\SimplifyEmptyCheckOnEmptyArrayRector;
-use Rector\CodeQuality\Rector\Expression\InlineIfToExplicitIfRector;
-use Rector\CodeQuality\Rector\Foreach_\UnusedForeachValueToArrayKeysRector;
 use Rector\CodeQuality\Rector\FuncCall\CompactToVariablesRector;
 use Rector\CodeQuality\Rector\FunctionLike\SimplifyUselessVariableRector;
+use Rector\CodeQuality\Rector\Isset_\IssetOnPropertyObjectToPropertyExistsRector;
 use Rector\CodeQuality\Rector\Ternary\TernaryEmptyArrayArrayDimFetchToCoalesceRector;
 use Rector\CodingStyle\Rector\ClassMethod\FuncGetArgsToVariadicParamRector;
 use Rector\CodingStyle\Rector\ClassMethod\MakeInheritedMethodVisibilitySameAsParentRector;
@@ -167,6 +166,9 @@
         CompactToVariablesRector::class,
 
         RemoveDataProviderParamKeysRector::class,
+
+        // possibly isset() on purpose, on updated Config classes property accross versions
+        IssetOnPropertyObjectToPropertyExistsRector::class,
     ])
     // auto import fully qualified class names
     ->withImportNames(removeUnusedImports: true)
@@ -179,9 +181,7 @@
         CountArrayToEmptyArrayComparisonRector::class,
         ChangeNestedForeachIfsToEarlyContinueRector::class,
         ChangeIfElseValueAssignToEarlyReturnRector::class,
-        InlineIfToExplicitIfRector::class,
         PreparedValueToEarlyReturnRector::class,
-        UnusedForeachValueToArrayKeysRector::class,
         RemoveErrorSuppressInTryCatchStmtsRector::class,
         FuncGetArgsToVariadicParamRector::class,
         MakeInheritedMethodVisibilitySameAsParentRector::class,
@@ -202,4 +202,4 @@
         // keep '\\' prefix string on string '\Foo\Bar'
         StringClassNameToClassConstantRector::SHOULD_KEEP_PRE_SLASH => true,
     ])
-    ->withCodeQualityLevel(41);
+    ->withCodeQualityLevel(51);
diff --git a/system/Commands/Database/CreateDatabase.php b/system/Commands/Database/CreateDatabase.php
index 0c8d2016dc93..facd060abf6e 100644
--- a/system/Commands/Database/CreateDatabase.php
+++ b/system/Commands/Database/CreateDatabase.php
@@ -109,7 +109,7 @@ public function run(array $params)
                 $config->{$group}['database'] = $name;
 
                 if ($name !== ':memory:') {
-                    $dbName = ! str_contains($name, DIRECTORY_SEPARATOR) ? WRITEPATH . $name : $name;
+                    $dbName = str_contains($name, DIRECTORY_SEPARATOR) ? $name : WRITEPATH . $name;
 
                     if (is_file($dbName)) {
                         CLI::error("Database \"{$dbName}\" already exists.", 'light_gray', 'red');
diff --git a/system/Database/BaseBuilder.php b/system/Database/BaseBuilder.php
index eb2dc6f73bd2..a2988dcede5a 100644
--- a/system/Database/BaseBuilder.php
+++ b/system/Database/BaseBuilder.php
@@ -1152,7 +1152,7 @@ protected function _like($field, string $match = '', string $type = 'AND ', stri
             return $this;
         }
 
-        $keyValue = ! is_array($field) ? [$field => $match] : $field;
+        $keyValue = is_array($field) ? $field : [$field => $match];
 
         foreach ($keyValue as $k => $v) {
             if ($insensitiveSearch) {
@@ -3065,7 +3065,7 @@ protected function compileSelect($selectOverride = false): string
         if ($selectOverride !== false) {
             $sql = $selectOverride;
         } else {
-            $sql = (! $this->QBDistinct) ? 'SELECT ' : 'SELECT DISTINCT ';
+            $sql = $this->QBDistinct ? 'SELECT DISTINCT ' : 'SELECT ';
 
             if (empty($this->QBSelect)) {
                 $sql .= '*';
diff --git a/system/Database/BaseUtils.php b/system/Database/BaseUtils.php
index 26957ffe01f1..a9310e1d4e32 100644
--- a/system/Database/BaseUtils.php
+++ b/system/Database/BaseUtils.php
@@ -250,7 +250,7 @@ public function getXMLFromResult(ResultInterface $query, array $params = []): st
             $xml .= $tab . '<' . $element . '>' . $newline;
 
             foreach ($row as $key => $val) {
-                $val = (! empty($val)) ? xml_convert((string) $val) : '';
+                $val = empty($val) ? '' : xml_convert((string) $val);
 
                 $xml .= $tab . $tab . '<' . $key . '>' . $val . '</' . $key . '>' . $newline;
             }
diff --git a/system/Database/Database.php b/system/Database/Database.php
index 80e902d5ab58..36a22862cdd4 100644
--- a/system/Database/Database.php
+++ b/system/Database/Database.php
@@ -136,9 +136,9 @@ protected function parseDSN(array $params): array
      */
     protected function initDriver(string $driver, string $class, $argument): object
     {
-        $classname = (! str_contains($driver, '\\'))
-            ? "CodeIgniter\\Database\\{$driver}\\{$class}"
-            : $driver . '\\' . $class;
+        $classname = str_contains($driver, '\\')
+            ? $driver . '\\' . $class
+            : "CodeIgniter\\Database\\{$driver}\\{$class}";
 
         return new $classname($argument);
     }
diff --git a/system/Database/MigrationRunner.php b/system/Database/MigrationRunner.php
index fdff86589132..8f723924539f 100644
--- a/system/Database/MigrationRunner.php
+++ b/system/Database/MigrationRunner.php
@@ -659,7 +659,7 @@ public function getHistory(string $group = 'default'): array
 
         $query = $builder->orderBy('id', 'ASC')->get();
 
-        return ! empty($query) ? $query->getResultObject() : [];
+        return empty($query) ? [] : $query->getResultObject();
     }
 
     /**
@@ -676,7 +676,7 @@ public function getBatchHistory(int $batch, $order = 'asc'): array
             ->orderBy('id', $order)
             ->get();
 
-        return ! empty($query) ? $query->getResultObject() : [];
+        return empty($query) ? [] : $query->getResultObject();
     }
 
     /**
diff --git a/system/Database/SQLSRV/Builder.php b/system/Database/SQLSRV/Builder.php
index ec4d41195626..0b17a52ff344 100644
--- a/system/Database/SQLSRV/Builder.php
+++ b/system/Database/SQLSRV/Builder.php
@@ -584,7 +584,7 @@ protected function compileSelect($selectOverride = false): string
         if ($selectOverride !== false) {
             $sql = $selectOverride;
         } else {
-            $sql = (! $this->QBDistinct) ? 'SELECT ' : 'SELECT DISTINCT ';
+            $sql = $this->QBDistinct ? 'SELECT DISTINCT ' : 'SELECT ';
 
             // SQL Server can't work with select * if group by is specified
             if (empty($this->QBSelect) && $this->QBGroupBy !== [] && is_array($this->QBGroupBy)) {
diff --git a/system/Debug/Timer.php b/system/Debug/Timer.php
index 37e9901977e7..98b1299a89f7 100644
--- a/system/Debug/Timer.php
+++ b/system/Debug/Timer.php
@@ -46,7 +46,7 @@ class Timer
     public function start(string $name, ?float $time = null)
     {
         $this->timers[strtolower($name)] = [
-            'start' => ! empty($time) ? $time : microtime(true),
+            'start' => empty($time) ? microtime(true) : $time,
             'end'   => null,
         ];
 
diff --git a/system/Email/Email.php b/system/Email/Email.php
index 9ed8465daa66..19282e7e5cce 100644
--- a/system/Email/Email.php
+++ b/system/Email/Email.php
@@ -839,7 +839,7 @@ public function setNewline($newline = "\n")
      */
     public function setCRLF($CRLF = "\n")
     {
-        $this->CRLF = ! in_array($CRLF, ["\n", "\r\n", "\r"], true) ? "\n" : $CRLF;
+        $this->CRLF = in_array($CRLF, ["\n", "\r\n", "\r"], true) ? $CRLF : "\n";
 
         return $this;
     }
@@ -2222,7 +2222,7 @@ protected function mimeTypes($ext = '')
     {
         $mime = Mimes::guessTypeFromExtension(strtolower($ext));
 
-        return ! empty($mime) ? $mime : 'application/x-unknown-content-type';
+        return empty($mime) ? 'application/x-unknown-content-type' : $mime;
     }
 
     public function __destruct()
diff --git a/system/HTTP/Response.php b/system/HTTP/Response.php
index 9de285b85d08..3c59f2e9800d 100644
--- a/system/HTTP/Response.php
+++ b/system/HTTP/Response.php
@@ -221,7 +221,7 @@ public function getStatusCode(): int
     public function getReasonPhrase()
     {
         if ($this->reason === '') {
-            return ! empty($this->statusCode) ? static::$statusCodes[$this->statusCode] : '';
+            return empty($this->statusCode) ? '' : static::$statusCodes[$this->statusCode];
         }
 
         return $this->reason;
diff --git a/system/HTTP/URI.php b/system/HTTP/URI.php
index 5bcf11de655a..6045f0fd3e64 100644
--- a/system/HTTP/URI.php
+++ b/system/HTTP/URI.php
@@ -181,9 +181,9 @@ public static function createURIString(
         }
 
         if ((string) $path !== '') {
-            $uri .= ! str_ends_with($uri, '/')
-                ? '/' . ltrim($path, '/')
-                : ltrim($path, '/');
+            $uri .= str_ends_with($uri, '/')
+                ? ltrim($path, '/')
+                : '/' . ltrim($path, '/');
         }
 
         if ((string) $query !== '') {
diff --git a/system/Helpers/form_helper.php b/system/Helpers/form_helper.php
index 7b89bb9ec173..a9415821f970 100644
--- a/system/Helpers/form_helper.php
+++ b/system/Helpers/form_helper.php
@@ -350,7 +350,7 @@ function form_checkbox($data = '', string $value = '', bool $checked = false, $e
     {
         $defaults = [
             'type'  => 'checkbox',
-            'name'  => (! is_array($data) ? $data : ''),
+            'name'  => is_array($data) ? '' : $data,
             'value' => $value,
         ];
 
diff --git a/system/Images/Handlers/ImageMagickHandler.php b/system/Images/Handlers/ImageMagickHandler.php
index bd2df0e49478..58bb0c912b94 100644
--- a/system/Images/Handlers/ImageMagickHandler.php
+++ b/system/Images/Handlers/ImageMagickHandler.php
@@ -72,7 +72,7 @@ public function __construct($config = null)
      */
     public function _resize(bool $maintainRatio = false)
     {
-        $source      = ! empty($this->resource) ? $this->resource : $this->image()->getPathname();
+        $source      = empty($this->resource) ? $this->image()->getPathname() : $this->resource;
         $destination = $this->getResourcePath();
 
         $escape = '\\';
@@ -99,7 +99,7 @@ public function _resize(bool $maintainRatio = false)
      */
     public function _crop()
     {
-        $source      = ! empty($this->resource) ? $this->resource : $this->image()->getPathname();
+        $source      = empty($this->resource) ? $this->image()->getPathname() : $this->resource;
         $destination = $this->getResourcePath();
 
         $extent = ' ';
@@ -126,7 +126,7 @@ protected function _rotate(int $angle)
     {
         $angle = '-rotate ' . $angle;
 
-        $source      = ! empty($this->resource) ? $this->resource : $this->image()->getPathname();
+        $source      = empty($this->resource) ? $this->image()->getPathname() : $this->resource;
         $destination = $this->getResourcePath();
 
         $action = ' ' . $angle . ' ' . escapeshellarg($source) . ' ' . escapeshellarg($destination);
@@ -147,7 +147,7 @@ protected function _flatten(int $red = 255, int $green = 255, int $blue = 255)
     {
         $flatten = "-background 'rgb({$red},{$green},{$blue})' -flatten";
 
-        $source      = ! empty($this->resource) ? $this->resource : $this->image()->getPathname();
+        $source      = empty($this->resource) ? $this->image()->getPathname() : $this->resource;
         $destination = $this->getResourcePath();
 
         $action = ' ' . $flatten . ' ' . escapeshellarg($source) . ' ' . escapeshellarg($destination);
@@ -168,7 +168,7 @@ protected function _flip(string $direction)
     {
         $angle = $direction === 'horizontal' ? '-flop' : '-flip';
 
-        $source      = ! empty($this->resource) ? $this->resource : $this->image()->getPathname();
+        $source      = empty($this->resource) ? $this->image()->getPathname() : $this->resource;
         $destination = $this->getResourcePath();
 
         $action = ' ' . $angle . ' ' . escapeshellarg($source) . ' ' . escapeshellarg($destination);
@@ -411,7 +411,7 @@ protected function _text(string $text, array $options = [])
         // Text
         $cmd .= ' -annotate 0 ' . escapeshellarg($text);
 
-        $source      = ! empty($this->resource) ? $this->resource : $this->image()->getPathname();
+        $source      = empty($this->resource) ? $this->image()->getPathname() : $this->resource;
         $destination = $this->getResourcePath();
 
         $cmd = ' ' . escapeshellarg($source) . ' ' . $cmd . ' ' . escapeshellarg($destination);
diff --git a/system/Model.php b/system/Model.php
index 44ed52a0edd0..60759b9e201f 100644
--- a/system/Model.php
+++ b/system/Model.php
@@ -396,7 +396,7 @@ protected function doInsert(array $row)
 
         // If insertion succeeded then save the insert ID
         if ($result) {
-            $this->insertID = ! $this->useAutoIncrement ? $row[$this->primaryKey] : $this->db->insertID();
+            $this->insertID = $this->useAutoIncrement ? $this->db->insertID() : $row[$this->primaryKey];
         }
 
         return $result;
diff --git a/system/Test/Fabricator.php b/system/Test/Fabricator.php
index 1a7c5c8f392f..b366464d5a26 100644
--- a/system/Test/Fabricator.php
+++ b/system/Test/Fabricator.php
@@ -168,7 +168,7 @@ public static function resetCounts()
      */
     public static function getCount(string $table): int
     {
-        return ! isset(self::$tableCounts[$table]) ? 0 : self::$tableCounts[$table];
+        return self::$tableCounts[$table] ?? 0;
     }
 
     /**
diff --git a/system/Validation/Validation.php b/system/Validation/Validation.php
index d3f2a3dc828f..37cf552499d9 100644
--- a/system/Validation/Validation.php
+++ b/system/Validation/Validation.php
@@ -918,7 +918,7 @@ protected function getErrorMessage(
 
         $args = [
             'field' => ($label === null || $label === '') ? $field : lang($label),
-            'param' => (! isset($this->rules[$param]['label'])) ? $param : lang($this->rules[$param]['label']),
+            'param' => isset($this->rules[$param]['label']) ? lang($this->rules[$param]['label']) : $param,
             'value' => $value ?? '',
         ];