It is recommended to use the &&, || operators, instead of and, or to prevent confusion.

Author: lfluvisotto

app/code/Magento/Catalog/Controller/Adminhtml/Product/Attribute/Validate.php

@@ -158,7 +158,7 @@ private function isUniqueAdminValues(array $optionsValues, array $deletedOptions
     {
         $adminValues = [];
         foreach ($optionsValues as $optionKey => $values) {
-            if (!(isset($deletedOptions[$optionKey]) and $deletedOptions[$optionKey] === '1')) {
+            if (!(isset($deletedOptions[$optionKey]) && $deletedOptions[$optionKey] === '1')) {
                 $adminValues[] = reset($values);
             }
         }

app/code/Magento/Paypal/Controller/Transparent/RequestSecureToken.php

@@ -82,7 +82,7 @@ public function execute()
         /** @var Quote $quote */
         $quote = $this->sessionManager->getQuote();
 
-        if (!$quote or !$quote instanceof Quote) {
+        if (!$quote || !$quote instanceof Quote) {
             return $this->getErrorResponse();
         }
 

app/code/Magento/Security/Model/SecurityChecker/Quantity.php

@@ -53,7 +53,7 @@ public function check($securityEventType, $accountReference = null, $longIp = nu
     {
         $isEnabled = $this->securityConfig->getPasswordResetProtectionType() != ResetMethod::OPTION_NONE;
         $allowedAttemptsNumber = $this->securityConfig->getMaxNumberPasswordResetRequests();
-        if ($isEnabled and $allowedAttemptsNumber) {
+        if ($isEnabled && $allowedAttemptsNumber) {
             $collection = $this->prepareCollection($securityEventType, $accountReference, $longIp);
             if ($collection->count() >= $allowedAttemptsNumber) {
                 throw new SecurityViolationException(

app/code/Magento/SendFriend/Model/SendFriend.php

@@ -236,7 +236,7 @@ public function validate()
         }
 
         $email = $this->getSender()->getEmail();
-        if (empty($email) or !\Zend_Validate::is($email, \Magento\Framework\Validator\EmailAddress::class)) {
+        if (empty($email) || !\Zend_Validate::is($email, \Magento\Framework\Validator\EmailAddress::class)) {
             $errors[] = __('Invalid Sender Email');
         }
 
@@ -281,13 +281,13 @@ public function setRecipients($recipients)
         // validate array
         if (!is_array(
             $recipients
-        ) or !isset(
+        ) || !isset(
             $recipients['email']
-        ) or !isset(
+        ) || !isset(
             $recipients['name']
-        ) or !is_array(
+        ) || !is_array(
             $recipients['email']
-        ) or !is_array(
+        ) || !is_array(
             $recipients['name']
         )
         ) {
@@ -487,7 +487,7 @@ protected function _sentCountByCookies($increment = false)
             $oldTimes = explode(',', $oldTimes);
             foreach ($oldTimes as $oldTime) {
                 $periodTime = $time - $this->_sendfriendData->getPeriod();
-                if (is_numeric($oldTime) and $oldTime >= $periodTime) {
+                if (is_numeric($oldTime) && $oldTime >= $periodTime) {
                     $newTimes[] = $oldTime;
                 }
             }

app/code/Magento/Tax/Model/Sales/Total/Quote/Tax.php

@@ -264,7 +264,7 @@ protected function processExtraTaxables(Address\Total $total, array $itemsByType
     {
         $extraTaxableDetails = [];
         foreach ($itemsByType as $itemType => $itemTaxDetails) {
-            if ($itemType != self::ITEM_TYPE_PRODUCT and $itemType != self::ITEM_TYPE_SHIPPING) {
+            if ($itemType != self::ITEM_TYPE_PRODUCT && $itemType != self::ITEM_TYPE_SHIPPING) {
                 foreach ($itemTaxDetails as $itemCode => $itemTaxDetail) {
                     /** @var \Magento\Tax\Api\Data\TaxDetailsInterface $taxDetails */
                     $taxDetails = $itemTaxDetail[self::KEY_ITEM];

dev/tests/static/testsuite/Magento/Test/Integrity/ClassesTest.php

@@ -191,7 +191,7 @@ private function assertClassesExist($classes, $path)
         foreach ($classes as $class) {
             $class = trim($class, '\\');
             try {
-                if (strrchr($class, '\\') === false and !Classes::isVirtual($class)) {
+                if (strrchr($class, '\\') === false && !Classes::isVirtual($class)) {
                     $badUsages[] = $class;
                     continue;
                 } else {

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

@@ -227,7 +227,7 @@ public function templateDirective($construction)
     {
         // Processing of {template config_path=... [...]} statement
         $templateParameters = $this->getParameters($construction[2]);
-        if (!isset($templateParameters['config_path']) or !$this->getTemplateProcessor()) {
+        if (!isset($templateParameters['config_path']) || !$this->getTemplateProcessor()) {
             // Not specified template or not set include processor
             $replacedValue = '{Error in template processing}';
         } else {

lib/internal/Magento/Framework/Message/Manager.php

@@ -226,7 +226,7 @@ public function addUniqueMessages(array $messages, $group = null)
         $items = $this->getMessages(false, $group)->getItems();
 
         foreach ($messages as $message) {
-            if ($message instanceof MessageInterface and !in_array($message, $items, false)) {
+            if ($message instanceof MessageInterface && !in_array($message, $items, false)) {
                 $this->addMessage($message, $group);
             }
         }

setup/src/Magento/Setup/Model/ConfigOptionsList/Session.php

@@ -301,7 +301,7 @@ public function validate(array $options, DeploymentConfig $deploymentConfig)
 
         if (isset($options[self::INPUT_KEY_SESSION_REDIS_LOG_LEVEL])) {
             $level = $options[self::INPUT_KEY_SESSION_REDIS_LOG_LEVEL];
-            if (($level < 0) or ($level > 7)) {
+            if (($level < 0) || ($level > 7)) {
                 $errors[] = "Invalid Redis log level '{$level}'. Valid range is 0-7, inclusive.";
             }
         }