Implementing Validation in ThinkPHP5 Using the Built-in Validate Class

This guide explains how to implement data validation in a ThinkPHP5 application by leveraging the framework's built‑in Validate class. It covers creating a custom validator, building a minimal HTML form for user input, and handling the validation logic in a controller method. Validator definition (PHP): ["name","parent_id"], ]; } The validator can be placed in the app\index\validate directory or under common as long as the namespace is correct. Frontend HTML form: 验证数据 This simple form sends a GET request with a name parameter to the validateF action of the Index controller. Backend controller method handling validation: public function validateF() { $data = input("get."); print_r($data); $validate = validate("Vdate"); // use the validator if(!$validate->scene("save")->check($data)){ $this->error($validate->getError()); // built‑in error response } // Continue with business logic $res = model("category")->add($data); if($res){ $this->success('新增成功'); }else{ $this->error("新增失败！"); } } When the request passes validation, the data is saved via the category model; otherwise, an error message is returned. Following these steps provides a complete, functional validation workflow in ThinkPHP5.