diff --git a/.gitignore b/.gitignore
index a38495e..8ca40d3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,7 @@ META-INF/
 
 # vim swp file #
 *.swp
+.idea
 
 # binding
 /binding/java/classes/
diff --git a/binding/php_extension/php5/ip2region/ip2region.c b/binding/php_extension/php5/ip2region/ip2region.c
index 0e9ec26..7139f3b 100644
--- a/binding/php_extension/php5/ip2region/ip2region.c
+++ b/binding/php_extension/php5/ip2region/ip2region.c
@@ -67,10 +67,10 @@ void search(
 
 	if ( res == 1 )
 	{
-		add_assoc_long( *return_value,   "cityId", (*_block).city_id);
+		add_assoc_long( *return_value,   "city_id", (*_block).city_id);
 		add_assoc_string( *return_value, "region", (*_block).region, 1);
 	} else {
-		add_assoc_long( *return_value,   "cityId", 0);
+		add_assoc_long( *return_value,   "city_id", 0);
 		add_assoc_string( *return_value, "region", "[Error] Search Failed! Please check the  path of ip2region db file.", 1);
 	}
 }
diff --git a/binding/php_extension/php7/ip2region/ip2region.c b/binding/php_extension/php7/ip2region/ip2region.c
index 7ea84ba..6b6e121 100644
--- a/binding/php_extension/php7/ip2region/ip2region.c
+++ b/binding/php_extension/php7/ip2region/ip2region.c
@@ -67,12 +67,12 @@ void search(
 
 	if ( res == 1 )
 	{
-		add_assoc_long( *return_value,   "cityId", (*_block).city_id);
+		add_assoc_long( *return_value,   "city_id", (*_block).city_id);
 		//add_assoc_string( *return_value, "region", (*_block).region, 1);
 		// for phpng
 		add_assoc_string( *return_value, "region", (*_block).region);
 	} else {
-		add_assoc_long( *return_value,   "cityId", 0);
+		add_assoc_long( *return_value,   "city_id", 0);
 		//add_assoc_string( *return_value, "region", "[Error] Search Failed! Please check the  path of ip2region db file.", 1);
 		// for phpng
 		add_assoc_string( *return_value, "region", "[Error] Search Failed! Please check the  path of ip2region db file.");