diff --git a/src/wp-admin/includes/class-wp-site-health.php b/src/wp-admin/includes/class-wp-site-health.php
index 72395c26b3..538552133d 100644
--- a/src/wp-admin/includes/class-wp-site-health.php
+++ b/src/wp-admin/includes/class-wp-site-health.php
@@ -802,30 +802,33 @@ class WP_Site_Health {
 	 * Make the check for available PHP modules into a simple boolean operator for a cleaner test runner.
 	 *
 	 * @since 5.2.0
-	 * @since 5.3.0 The `$constant` and `$class` parameters were added.
+	 * @since 5.3.0 The `$constant_name` and `$class_name` parameters were added.
 	 *
-	 * @param string $extension Optional. The extension name to test. Default null.
-	 * @param string $function  Optional. The function name to test. Default null.
-	 * @param string $constant  Optional. The constant name to test for. Default null.
-	 * @param string $class     Optional. The class name to test for. Default null.
+	 * @param string $extension_name Optional. The extension name to test. Default null.
+	 * @param string $function_name  Optional. The function name to test. Default null.
+	 * @param string $constant_name  Optional. The constant name to test for. Default null.
+	 * @param string $class_name     Optional. The class name to test for. Default null.
 	 * @return bool Whether or not the extension and function are available.
 	 */
-	private function test_php_extension_availability( $extension = null, $function = null, $constant = null, $class = null ) {
+	private function test_php_extension_availability( $extension_name = null, $function_name = null, $constant_name = null, $class_name = null ) {
 		// If no extension or function is passed, claim to fail testing, as we have nothing to test against.
-		if ( ! $extension && ! $function && ! $constant && ! $class ) {
+		if ( ! $extension_name && ! $function_name && ! $constant_name && ! $class_name ) {
 			return false;
 		}
 
-		if ( $extension && ! extension_loaded( $extension ) ) {
+		if ( $extension_name && ! extension_loaded( $extension_name ) ) {
 			return false;
 		}
-		if ( $function && ! function_exists( $function ) ) {
+
+		if ( $function_name && ! function_exists( $function_name ) ) {
 			return false;
 		}
-		if ( $constant && ! defined( $constant ) ) {
+
+		if ( $constant_name && ! defined( $constant_name ) ) {
 			return false;
 		}
-		if ( $class && ! class_exists( $class ) ) {
+
+		if ( $class_name && ! class_exists( $class_name ) ) {
 			return false;
 		}
 
@@ -994,10 +997,10 @@ class WP_Site_Health {
 		$failures = array();
 
 		foreach ( $modules as $library => $module ) {
-			$extension  = ( isset( $module['extension'] ) ? $module['extension'] : null );
-			$function   = ( isset( $module['function'] ) ? $module['function'] : null );
-			$constant   = ( isset( $module['constant'] ) ? $module['constant'] : null );
-			$class_name = ( isset( $module['class'] ) ? $module['class'] : null );
+			$extension_name = ( isset( $module['extension'] ) ? $module['extension'] : null );
+			$function_name  = ( isset( $module['function'] ) ? $module['function'] : null );
+			$constant_name  = ( isset( $module['constant'] ) ? $module['constant'] : null );
+			$class_name     = ( isset( $module['class'] ) ? $module['class'] : null );
 
 			// If this module is a fallback for another function, check if that other function passed.
 			if ( isset( $module['fallback_for'] ) ) {
@@ -1012,7 +1015,10 @@ class WP_Site_Health {
 				}
 			}
 
-			if ( ! $this->test_php_extension_availability( $extension, $function, $constant, $class_name ) && ( ! isset( $module['php_bundled_version'] ) || version_compare( PHP_VERSION, $module['php_bundled_version'], '<' ) ) ) {
+			if ( ! $this->test_php_extension_availability( $extension_name, $function_name, $constant_name, $class_name )
+				&& ( ! isset( $module['php_bundled_version'] )
+					|| version_compare( PHP_VERSION, $module['php_bundled_version'], '<' ) )
+			) {
 				if ( $module['required'] ) {
 					$result['status'] = 'critical';