diff --git a/includes/admin/fields/class-open-router-model-field.php b/includes/admin/fields/class-open-router-model-field.php
index 7b0aa5b..7b71b76 100644
--- a/includes/admin/fields/class-open-router-model-field.php
+++ b/includes/admin/fields/class-open-router-model-field.php
@@ -137,12 +137,12 @@ class PRAutoBlogger_OpenRouter_Model_Field {
 	 * @return string[] Stage names, e.g. ['outline', 'draft', 'polish'] for writing model.
 	 */
 	private static function get_stages_for_setting( string $field_id ): array {
-		$map = [
-			'prautoblogger_analysis_model' => [ 'analysis' ],
-			'prautoblogger_writing_model'  => [ 'outline', 'draft', 'polish' ],
-			'prautoblogger_editor_model'   => [ 'review' ],
-		];
-		return $map[ $field_id ] ?? [];
+		$map = array(
+			'prautoblogger_analysis_model' => array( 'analysis' ),
+			'prautoblogger_writing_model'  => array( 'outline', 'draft', 'polish' ),
+			'prautoblogger_editor_model'   => array( 'review' ),
+		);
+		return $map[ $field_id ] ?? array();
 	}
 
 	/**
diff --git a/includes/core/class-cost-tracker.php b/includes/core/class-cost-tracker.php
index 337c098..c874cbf 100644
--- a/includes/core/class-cost-tracker.php
+++ b/includes/core/class-cost-tracker.php
@@ -228,11 +228,11 @@ class PRAutoBlogger_Cost_Tracker {
 		global $wpdb;
 
 		if ( empty( $stages ) ) {
-			return [
+			return array(
 				'avg_prompt_tokens'      => 0.0,
 				'avg_completion_tokens'  => 0.0,
 				'sample_size'            => 0,
-			];
+			);
 		}
 
 		$cutoff_time   = time() - ( $days * DAY_IN_SECONDS );
@@ -254,17 +254,17 @@ class PRAutoBlogger_Cost_Tracker {
 		$result = $wpdb->get_row( $query, ARRAY_A );
 
 		if ( ! $result || 0 === (int) ( $result['sample_count'] ?? 0 ) ) {
-			return [
+			return array(
 				'avg_prompt_tokens'      => 0.0,
 				'avg_completion_tokens'  => 0.0,
 				'sample_size'            => 0,
-			];
+			);
 		}
 
-		return [
+		return array(
 			'avg_prompt_tokens'      => (float) ( $result['avg_input'] ?? 0 ),
 			'avg_completion_tokens'  => (float) ( $result['avg_output'] ?? 0 ),
 			'sample_size'            => (int) ( $result['sample_count'] ?? 0 ),
-		];
+		);
 	}
 }