fix: check array values

bind.go

@@ -232,7 +232,12 @@ func (b *DefaultBinder) bindData(destination interface{}, data map[string][]stri
 			}
 		}
 
-		inputValue, exists := data[inputFieldName]
+		var inputValue []string
+		var exists bool
+		inputValue, exists = data[inputFieldName]
+		if !exists {
+			inputValue, exists = data[inputFieldName+"[]"]
+		}
 		if !exists {
 			// Go json.Unmarshal supports case-insensitive binding.  However the
 			// url params are bound case-sensitive which is inconsistent.  To

bind_test.go

@@ -62,6 +62,10 @@ type bindTestStruct struct {
 	SA          StringArray
 }
 
+type bindQueryArrayTestStruct struct {
+	Foo []string `query:"foo"`
+}
+
 type bindTestStructWithTags struct {
 	I           int      `json:"I" form:"I"`
 	PtrI        *int     `json:"PtrI" form:"PtrI"`
@@ -275,6 +279,30 @@ func TestBindQueryParamsCaseSensitivePrioritized(t *testing.T) {
 	}
 }
 
+func TestBindQueryArrayParams(t *testing.T) {
+	e := New()
+	req := httptest.NewRequest(http.MethodGet, "/?foo=one&foo=two", nil)
+	rec := httptest.NewRecorder()
+	c := e.NewContext(req, rec)
+	q := new(bindQueryArrayTestStruct)
+	err := c.Bind(q)
+	if assert.NoError(t, err) {
+		assert.Equal(t, []string{"one", "two"}, q.Foo)
+	}
+}
+
+func TestBindQueryArrayParamsWithSuffix(t *testing.T) {
+	e := New()
+	req := httptest.NewRequest(http.MethodGet, "/?foo[]=one&foo[]=two", nil)
+	rec := httptest.NewRecorder()
+	c := e.NewContext(req, rec)
+	q := new(bindQueryArrayTestStruct)
+	err := c.Bind(q)
+	if assert.NoError(t, err) {
+		assert.Equal(t, []string{"one", "two"}, q.Foo)
+	}
+}
+
 func TestBindHeaderParam(t *testing.T) {
 	e := New()
 	req := httptest.NewRequest(http.MethodGet, "/", nil)