diff --git a/src/wp-includes/PHPMailer/PHPMailer.php b/src/wp-includes/PHPMailer/PHPMailer.php
index ed14d7c7a2..27af1a937b 100644
--- a/src/wp-includes/PHPMailer/PHPMailer.php
+++ b/src/wp-includes/PHPMailer/PHPMailer.php
@@ -853,7 +853,7 @@ class PHPMailer
     private function mailPassthru($to, $subject, $body, $header, $params)
     {
         //Check overloading of mail function to avoid double-encoding
-        if (ini_get('mbstring.func_overload') & 1) {
+        if (ini_get('mbstring.func_overload') & 1) { // phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.mbstring_func_overloadDeprecated
             $subject = $this->secureHeader($subject);
         } else {
             $subject = $this->encodeHeader($this->secureHeader($subject));
@@ -1401,10 +1401,13 @@ class PHPMailer
                 //Ignore IDE complaints about this line - method signature changed in PHP 5.4
                 $errorcode = 0;
                 if (defined('INTL_IDNA_VARIANT_UTS46')) {
+                    // phpcs:ignore PHPCompatibility.ParameterValues.NewIDNVariantDefault.NotSet
                     $punycode = idn_to_ascii($domain, $errorcode, INTL_IDNA_VARIANT_UTS46);
                 } elseif (defined('INTL_IDNA_VARIANT_2003')) {
+                    // phpcs:ignore PHPCompatibility.Constants.RemovedConstants.intl_idna_variant_2003Deprecated
                     $punycode = idn_to_ascii($domain, $errorcode, INTL_IDNA_VARIANT_2003);
                 } else {
+                    // phpcs:ignore PHPCompatibility.ParameterValues.NewIDNVariantDefault.NotSet
                     $punycode = idn_to_ascii($domain, $errorcode);
                 }
                 if (false !== $punycode) {
diff --git a/src/wp-includes/Text/Diff/Engine/shell.php b/src/wp-includes/Text/Diff/Engine/shell.php
index 91c1843b83..a2ccc70db8 100644
--- a/src/wp-includes/Text/Diff/Engine/shell.php
+++ b/src/wp-includes/Text/Diff/Engine/shell.php
@@ -83,7 +83,7 @@ class Text_Diff_Engine_shell {
 
             if ($from_line_no < $match[1] || $to_line_no < $match[4]) {
                 // copied lines
-                assert('$match[1] - $from_line_no == $match[4] - $to_line_no');
+                assert($match[1] - $from_line_no == $match[4] - $to_line_no);
                 array_push($edits,
                     new Text_Diff_Op_copy(
                         $this->_getLines($from_lines, $from_line_no, $match[1] - 1),