Replace strval() function by using direct type casting to (string)

app/code/Magento/Authorizenet/Model/Directpost/Request.php

@@ -112,50 +112,50 @@ public function setDataFromOrder(
             sprintf('%.2F', $order->getBaseShippingAmount())
         );
 
-        //need to use strval() because NULL values IE6-8 decodes as "null" in JSON in JavaScript,
+        //need to use (string) because NULL values IE6-8 decodes as "null" in JSON in JavaScript,
         //but we need "" for null values.
         $billing = $order->getBillingAddress();
         if (!empty($billing)) {
-            $this->setXFirstName(strval($billing->getFirstname()))
-                ->setXLastName(strval($billing->getLastname()))
-                ->setXCompany(strval($billing->getCompany()))
-                ->setXAddress(strval($billing->getStreetLine(1)))
-                ->setXCity(strval($billing->getCity()))
-                ->setXState(strval($billing->getRegion()))
-                ->setXZip(strval($billing->getPostcode()))
-                ->setXCountry(strval($billing->getCountryId()))
-                ->setXPhone(strval($billing->getTelephone()))
-                ->setXFax(strval($billing->getFax()))
-                ->setXCustId(strval($billing->getCustomerId()))
-                ->setXCustomerIp(strval($order->getRemoteIp()))
-                ->setXCustomerTaxId(strval($billing->getTaxId()))
-                ->setXEmail(strval($order->getCustomerEmail()))
-                ->setXEmailCustomer(strval($paymentMethod->getConfigData('email_customer')))
-                ->setXMerchantEmail(strval($paymentMethod->getConfigData('merchant_email')));
+            $this->setXFirstName((string)$billing->getFirstname())
+                ->setXLastName((string)$billing->getLastname())
+                ->setXCompany((string)$billing->getCompany())
+                ->setXAddress((string)$billing->getStreetLine(1))
+                ->setXCity((string)$billing->getCity())
+                ->setXState((string)$billing->getRegion())
+                ->setXZip((string)$billing->getPostcode())
+                ->setXCountry((string)$billing->getCountryId())
+                ->setXPhone((string)$billing->getTelephone())
+                ->setXFax((string)$billing->getFax())
+                ->setXCustId((string)$billing->getCustomerId())
+                ->setXCustomerIp((string)$order->getRemoteIp())
+                ->setXCustomerTaxId((string)$billing->getTaxId())
+                ->setXEmail((string)$order->getCustomerEmail())
+                ->setXEmailCustomer((string)$paymentMethod->getConfigData('email_customer'))
+                ->setXMerchantEmail((string)$paymentMethod->getConfigData('merchant_email'));
         }
 
         $shipping = $order->getShippingAddress();
         if (!empty($shipping)) {
             $this->setXShipToFirstName(
-                strval($shipping->getFirstname())
+                (string)$shipping->getFirstname()
             )->setXShipToLastName(
-                strval($shipping->getLastname())
+                (string)$shipping->getLastname()
             )->setXShipToCompany(
-                strval($shipping->getCompany())
+                (string)$shipping->getCompany()
             )->setXShipToAddress(
-                strval($shipping->getStreetLine(1))
+                (string)$shipping->getStreetLine(1)
             )->setXShipToCity(
-                strval($shipping->getCity())
+                (string)$shipping->getCity()
             )->setXShipToState(
-                strval($shipping->getRegion())
+                (string)$shipping->getRegion()
             )->setXShipToZip(
-                strval($shipping->getPostcode())
+                (string)$shipping->getPostcode()
             )->setXShipToCountry(
-                strval($shipping->getCountryId())
+                (string)$shipping->getCountryId()
             );
         }
 
-        $this->setXPoNum(strval($payment->getPoNumber()));
+        $this->setXPoNum((string)$payment->getPoNumber());
 
         return $this;
     }

app/code/Magento/Config/Model/Config/Backend/Currency/AbstractCurrency.php

@@ -71,7 +71,7 @@ protected function _getCurrencyBase()
                 $this->getScopeId()
             );
         }
-        return strval($value);
+        return (string)$value;
     }
 
     /**
@@ -88,7 +88,7 @@ protected function _getCurrencyDefault()
                 $this->getScopeId()
             );
         }
-        return strval($value);
+        return (string)$value;
     }
 
     /**

app/code/Magento/Integration/Block/Adminhtml/Integration/Edit/Tab/Info.php

@@ -78,7 +78,7 @@ public function getTabTitle()
     }
 
     /**
-     * Returns status flag about this tab can be showen or not
+     * Returns status flag about this tab can be shown or not
      *
      * @return true
      */

app/code/Magento/Paypal/Controller/Payflow/ReturnUrl.php

@@ -50,7 +50,7 @@ public function execute()
                     $redirectBlock->setData('goto_success_page', true);
                 } else {
                     if ($this->checkPaymentMethod($order)) {
-                        $gotoSection = $this->_cancelPayment(strval($this->getRequest()->getParam('RESPMSG')));
+                        $gotoSection = $this->_cancelPayment((string)$this->getRequest()->getParam('RESPMSG'));
                         $redirectBlock->setData('goto_section', $gotoSection);
                         $redirectBlock->setData('error_msg', __('Your payment has been declined. Please try again.'));
                     } else {

app/code/Magento/Quote/Model/Quote.php

@@ -1608,7 +1608,7 @@ public function addProduct(
          * Error message
          */
         if (is_string($cartCandidates) || $cartCandidates instanceof \Magento\Framework\Phrase) {
-            return strval($cartCandidates);
+            return (string)$cartCandidates;
         }
 
         /**

dev/tests/functional/tests/app/Magento/CatalogSearch/Test/Fixture/CatalogSearchQuery/QueryText.php

@@ -70,7 +70,7 @@ private function createProducts(FixtureFactory $fixtureFactory, $productsData)
 
                 $products[] = $product;
             } elseif ($this->data === null) {
-                $this->data = strval($productData);
+                $this->data = (string)$productData;
             }
         }
 

dev/tests/functional/tests/app/Magento/UrlRewrite/Test/Fixture/UrlRewrite/TargetPath.php

@@ -44,7 +44,7 @@ public function __construct(FixtureFactory $fixtureFactory, array $params, $data
             $id = $this->entity->hasData('id') ? $this->entity->getId() : $this->entity->getPageId();
             $this->data = preg_replace('`(%.*?%)`', $id, $data['entity']);
         } else {
-            $this->data = strval($data['entity']);
+            $this->data = (string)$data['entity'];
         }
     }
 

lib/internal/Magento/Framework/App/DeploymentConfig.php

@@ -117,7 +117,7 @@ public function resetData()
     }
 
     /**
-     * Check if data from deploy files is avaiable
+     * Check if data from deploy files is available
      *
      * @return bool
      * @since 100.1.3

lib/internal/Magento/Framework/DB/Select/OrderRenderer.php

@@ -40,12 +40,12 @@ public function render(Select $select, $sql = '')
             $order = [];
             foreach ($select->getPart(Select::ORDER) as $term) {
                 if (is_array($term)) {
-                    if (is_numeric($term[0]) && strval(intval($term[0])) == $term[0]) {
+                    if (is_numeric($term[0]) && (string)intval($term[0]) == $term[0]) {
                         $order[] = (int)trim($term[0]) . ' ' . $term[1];
                     } else {
                         $order[] = $this->quote->quoteIdentifier($term[0]) . ' ' . $term[1];
                     }
-                } elseif (is_numeric($term) && strval(intval($term)) == $term) {
+                } elseif (is_numeric($term) && (string)intval($term) == $term) {
                     $order[] = (int)trim($term);
                 } else {
                     $order[] = $this->quote->quoteIdentifier($term);

lib/internal/Magento/Framework/Data/Form/Element/Checkboxes.php

@@ -121,13 +121,13 @@ public function getChecked($value)
             return;
         }
         if (!is_array($checked)) {
-            $checked = [strval($checked)];
+            $checked = [(string)$checked];
         } else {
             foreach ($checked as $k => $v) {
-                $checked[$k] = strval($v);
+                $checked[$k] = (string)$v;
             }
         }
-        if (in_array(strval($value), $checked)) {
+        if (in_array((string)$value, $checked)) {
             return 'checked';
         }
         return;
@@ -141,13 +141,13 @@ public function getDisabled($value)
     {
         if ($disabled = $this->getData('disabled')) {
             if (!is_array($disabled)) {
-                $disabled = [strval($disabled)];
+                $disabled = [(string)$disabled];
             } else {
                 foreach ($disabled as $k => $v) {
-                    $disabled[$k] = strval($v);
+                    $disabled[$k] = (string)$v;
                 }
             }
-            if (in_array(strval($value), $disabled)) {
+            if (in_array((string)$value, $disabled)) {
                 return 'disabled';
             }
         }

lib/internal/Magento/Framework/Filter/Translit.php

@@ -409,7 +409,7 @@ public function __construct(\Magento\Framework\App\Config\ScopeConfigInterface $
         $convertConfig = $config->getValue('url/convert', 'default');
         if ($convertConfig) {
             foreach ($convertConfig as $configValue) {
-                $this->convertTable[strval($configValue['from'])] = strval($configValue['to']);
+                $this->convertTable[(string)$configValue['from']] = strval($configValue['to']);
             }
         }
     }

lib/internal/Magento/Framework/Phrase/Renderer/Placeholder.php

@@ -40,6 +40,6 @@ public function render(array $source, array $arguments)
      */
     private function keyToPlaceholder($key)
     {
-        return '%' . (is_int($key) ? strval($key + 1) : $key);
+        return '%' . (is_int($key) ? (string)($key + 1) : $key);
     }
 }

setup/src/Magento/Setup/Console/Command/InstallCommand.php

@@ -50,7 +50,7 @@ class InstallCommand extends AbstractSetupCommand
     /**
      * List of comma-separated module names. That must be avoided during installation.
      * List of comma-separated module names. That must be avoided during installation.
-     * Avaiable magic param all.
+     * Available magic param all.
      */
     const INPUT_KEY_DISABLE_MODULES = 'disable_modules';
 
@@ -166,14 +166,14 @@ protected function configure()
                 null,
                 InputOption::VALUE_OPTIONAL,
                 'List of comma-separated module names. That must be included during installation. '
-                . 'Avaiable magic param "all".'
+                . 'Available magic param "all".'
             ),
             new InputOption(
                 self::INPUT_KEY_DISABLE_MODULES,
                 null,
                 InputOption::VALUE_OPTIONAL,
                 'List of comma-separated module names. That must be avoided during installation. '
-                . 'Avaiable magic param "all".'
+                . 'Available magic param "all".'
             ),
             new InputOption(
                 self::CONVERT_OLD_SCRIPTS_KEY,