Phpstan fixes

app/code/core/Mage/ImportExport/Block/Adminhtml/Export/Filter.php

@@ -434,11 +434,11 @@ public function getFilterElementName($attributeCode)
      * Get row edit URL.
      *
      * @param Mage_Catalog_Model_Resource_Eav_Attribute $row
-     * @return false
+     * @return string
      */
     public function getRowUrl($row)
     {
-        return false;
+        return '';
     }
 
     /**

app/code/core/Mage/ImportExport/Helper/Data.php

@@ -37,7 +37,9 @@ class Mage_ImportExport_Helper_Data extends Mage_Core_Helper_Data
      */
     public function getMaxUploadSize()
     {
-        return min(ini_get('post_max_size'), ini_get('upload_max_filesize'));
+        $postMaxSizeBytes = ini_parse_quantity(ini_get('post_max_size'));
+        $uploadMaxSizeBytes = ini_parse_quantity(ini_get('upload_max_filesize'));
+        return min($postMaxSizeBytes, $uploadMaxSizeBytes);
     }
 
     /**

app/code/core/Mage/ImportExport/Model/Export.php

@@ -65,7 +65,9 @@ protected function _getEntityAdapter()
 
             if (isset($validTypes[$this->getEntity()])) {
                 try {
-                    $this->_entityAdapter = Mage::getModel($validTypes[$this->getEntity()]['model']);
+                    /** @var Mage_ImportExport_Model_Export_Entity_Abstract $_entityAdapter */
+                    $_entityAdapter = Mage::getModel($validTypes[$this->getEntity()]['model']);
+                    $this->_entityAdapter = $_entityAdapter;
                 } catch (Exception $e) {
                     Mage::logException($e);
                     Mage::throwException(
@@ -104,7 +106,9 @@ protected function _getWriter()
 
             if (isset($validWriters[$this->getFileFormat()])) {
                 try {
-                    $this->_writer = Mage::getModel($validWriters[$this->getFileFormat()]['model']);
+                    /** @var Mage_ImportExport_Model_Export_Adapter_Abstract $_writer */
+                    $_writer = Mage::getModel($validWriters[$this->getFileFormat()]['model']);
+                    $this->_writer = $_writer;
                 } catch (Exception $e) {
                     Mage::logException($e);
                     Mage::throwException(
@@ -185,8 +189,7 @@ public function exportFile()
                     Mage::throwException(
                         Mage::helper('importexport')->__('There is no data for export')
                     );
-                }
-                if ($result['rows']) {
+                } else {
                     $this->addLogComment([
                         Mage::helper('importexport')->__('Exported %s rows.', $result['rows']),
                         Mage::helper('importexport')->__('Export has been done.')

app/code/core/Mage/ImportExport/Model/Export/Entity/Abstract.php

@@ -52,7 +52,7 @@ abstract class Mage_ImportExport_Model_Export_Entity_Abstract
     /**
      * Entity type id.
      *
-     * @var int
+     * @var string|null
      */
     protected $_entityTypeId;
 
@@ -170,7 +170,10 @@ public function __construct()
     {
         $entityCode = $this->getEntityTypeCode();
         $this->_entityTypeId = Mage::getSingleton('eav/config')->getEntityType($entityCode)->getEntityTypeId();
-        $this->_connection   = Mage::getSingleton('core/resource')->getConnection('write');
+
+        /** @var Varien_Db_Adapter_Pdo_Mysql $_connection */
+        $_connection         = Mage::getSingleton('core/resource')->getConnection('write');
+        $this->_connection   = $_connection;
     }
 
     /**
@@ -436,7 +439,7 @@ abstract public function getEntityTypeCode();
     /**
      * Entity type ID getter.
      *
-     * @return int
+     * @return string|null
      */
     public function getEntityTypeId()
     {

app/code/core/Mage/ImportExport/Model/Import.php

@@ -56,7 +56,7 @@ class Mage_ImportExport_Model_Import extends Mage_ImportExport_Model_Abstract
     /**
      * Entity invalidated indexes.
      *
-     * @var Mage_ImportExport_Model_Import_Entity_Abstract
+     * @var array<string, array<int, string>>
      */
     protected static $_entityInvalidatedIndexes = [
         'catalog_product' => [
@@ -80,7 +80,9 @@ protected function _getEntityAdapter()
 
             if (isset($validTypes[$this->getEntity()])) {
                 try {
-                    $this->_entityAdapter = Mage::getModel($validTypes[$this->getEntity()]['model']);
+                    /** @var Mage_ImportExport_Model_Import_Entity_Abstract $_entityAdapter */
+                    $_entityAdapter = Mage::getModel($validTypes[$this->getEntity()]['model']);
+                    $this->_entityAdapter = $_entityAdapter;
                 } catch (Exception $e) {
                     Mage::logException($e);
                     Mage::throwException(
@@ -366,7 +368,7 @@ public function expandSource()
                     if (!empty($row[$colName])) {
                         preg_match($regExps[$regExpType], $row[$colName], $m);
 
-                        $row[$colName] = $m[1] . ($m[2] + $size) . ($regExpType == 'middle' ? $m[3] : '');
+                        $row[$colName] = $m[1] . ((int) $m[2] + $size) . ($regExpType == 'middle' ? $m[3] : '');
                     }
                 }
                 $writer->writeRow($row);

app/code/core/Mage/ImportExport/Model/Import/Entity/Abstract.php

@@ -33,7 +33,7 @@ abstract class Mage_ImportExport_Model_Import_Entity_Abstract
     /**
      * DB connection.
      *
-     * @var Varien_Convert_Adapter_Interface
+     * @var Varien_Db_Adapter_Pdo_Mysql
      */
     protected $_connection;
 
@@ -54,7 +54,7 @@ abstract class Mage_ImportExport_Model_Import_Entity_Abstract
     /**
      * Entity type id.
      *
-     * @var int
+     * @var string|null
      */
     protected $_entityTypeId;
 
@@ -183,10 +183,13 @@ abstract class Mage_ImportExport_Model_Import_Entity_Abstract
 
     public function __construct()
     {
-        $entityType = Mage::getSingleton('eav/config')->getEntityType($this->getEntityTypeCode());
+        $entityType             = Mage::getSingleton('eav/config')->getEntityType($this->getEntityTypeCode());
         $this->_entityTypeId    = $entityType->getEntityTypeId();
         $this->_dataSourceModel = Mage_ImportExport_Model_Import::getDataSourceModel();
-        $this->_connection      = Mage::getSingleton('core/resource')->getConnection('write');
+
+        /** @var Varien_Db_Adapter_Pdo_Mysql $_connection */
+        $_connection            = Mage::getSingleton('core/resource')->getConnection('write');
+        $this->_connection      = $_connection;
     }
 
     /**
@@ -398,7 +401,7 @@ abstract public function getEntityTypeCode();
     /**
      * Entity type ID getter.
      *
-     * @return int
+     * @return string|null
      */
     public function getEntityTypeId()
     {

app/code/core/Mage/ImportExport/Model/Import/Entity/Customer.php

@@ -369,6 +369,7 @@ protected function _saveCustomers()
             $entityRowsIn = [];
             $entityRowsUp = [];
             $attributes   = [];
+            $entityId     = null;
 
             $oldCustomersToLower = array_change_key_case($this->_oldCustomers, CASE_LOWER);
 

app/code/core/Mage/ImportExport/Model/Import/Entity/Product.php

@@ -416,7 +416,7 @@ class Mage_ImportExport_Model_Import_Entity_Product extends Mage_ImportExport_Mo
     /**
      * url_key attribute id
      *
-     * @var int
+     * @var string|false|null
      */
     protected $_urlKeyAttributeId;
 
@@ -901,6 +901,8 @@ protected function _saveCustomOptions()
                         'updated_at'       => Varien_Date::now()
                     ];
                 }
+
+                $prevOptionId = 0;
                 if ($rowIsMain) {
                     $solidParams = [
                         'option_id'      => $nextOptionId,
@@ -1152,6 +1154,7 @@ protected function _saveLinks()
             $productIds   = [];
             $linkRows     = [];
             $positionRows = [];
+            $sku          = null;
 
             foreach ($bunch as $rowNum => $rowData) {
                 $this->_filterRowData($rowData);
@@ -1362,6 +1365,7 @@ protected function _saveProducts()
             $tierPrices   = [];
             $groupPrices  = [];
             $mediaGallery = [];
+            $rowSku       = null;
             $uploadedGalleryFiles = [];
             $previousType = null;
             $previousAttributeSet = null;
@@ -2207,7 +2211,7 @@ public function getAffectedEntityIds()
     /**
      * Get product url_key attribute id
      *
-     * @return null|int
+     * @return string|false|null
      */
     protected function _getUrlKeyAttributeId()
     {

app/code/core/Mage/ImportExport/Model/Import/Entity/Product/Type/Configurable.php

@@ -356,6 +356,8 @@ public function saveData()
         $newSku          = $this->_entityModel->getNewSku();
         $oldSku          = $this->_entityModel->getOldSku();
         $productSuperData = [];
+        $productSuperAttrId = null;
+        $productId       = null;
         $productData     = null;
         /** @var Mage_ImportExport_Model_Resource_Helper_Mysql4 $helper */
         $helper          = Mage::getResourceHelper('importexport');

app/code/core/Mage/ImportExport/Model/Import/Entity/Product/Type/Grouped.php

@@ -65,6 +65,7 @@ public function saveData()
         $newSku        = $this->_entityModel->getNewSku();
         $oldSku        = $this->_entityModel->getOldSku();
         $attributes    = [];
+        $productData   = [];
 
         // pre-load attributes parameters
         $select = $connection->select()
@@ -101,6 +102,7 @@ public function saveData()
                 } else {
                     continue;
                 }
+
                 $scope = $this->_entityModel->getRowScope($rowData);
                 if (Mage_ImportExport_Model_Import_Entity_Product::SCOPE_DEFAULT == $scope) {
                     $productData = $newSku[$rowData[Mage_ImportExport_Model_Import_Entity_Product::COL_SKU]];

app/code/core/Mage/Shipping/Model/Carrier/Abstract.php

@@ -97,7 +97,7 @@ abstract class Mage_Shipping_Model_Carrier_Abstract extends Varien_Object
     /**
      * Rate result data
      *
-     * @var Mage_Shipping_Model_Rate_Result|null
+     * @var Mage_Shipping_Model_Rate_Result|Mage_Shipping_Model_Tracking_Result|null
      */
     protected $_result;
 

app/code/core/Mage/Uploader/Helper/File.php

@@ -703,7 +703,7 @@ public function getUploadMaxSize()
     /**
      * Get max upload size
      *
-     * @return mixed
+     * @return string
      */
     public function getDataMaxSize()
     {

app/code/core/Mage/Usa/Model/Shipping/Carrier/Usps.php

@@ -85,10 +85,18 @@ class Mage_Usa_Model_Shipping_Carrier_Usps extends Mage_Usa_Model_Shipping_Carri
      */
     protected $_rawRequest = null;
 
+
+    /**
+     * Raw rate tracking request data
+     *
+     * @var Varien_Object|null
+     */
+    protected $_rawTrackRequest = null;
+
     /**
      * Rate result data
      *
-     * @var Mage_Shipping_Model_Rate_Result|null
+     * @var Mage_Shipping_Model_Rate_Result|Mage_Shipping_Model_Tracking_Result|null
      */
     protected $_result = null;
 
@@ -425,7 +433,7 @@ protected function _getXmlQuotes()
      *
      * @link http://www.usps.com/webtools/htm/Rate-Calculators-v2-3.htm
      * @param string $response
-     * @return Mage_Shipping_Model_Rate_Result
+     * @return Mage_Shipping_Model_Rate_Result|void
      */
     protected function _parseXmlResponse($response)
     {
@@ -512,6 +520,7 @@ protected function _parseXmlResponse($response)
             }
         }
     }
+
     /**
      * Get configuration data of carrier
      *
@@ -901,7 +910,7 @@ public function getTracking($trackingData)
     /**
      * Set tracking request
      *
-     * @return null
+     * @return void
      */
     protected function setTrackingRequest()
     {
@@ -960,7 +969,7 @@ protected function _getXmlTracking($trackingData)
      *
      * @param array $trackingValue
      * @param string $response
-     * @return null
+     * @return void
      */
     protected function _parseXmlTrackingResponse($trackingValue, $response)
     {