Implementing Validation in ThinkPHP5 Using the Built-in Validate Class
This article demonstrates how to use ThinkPHP5's built‑in Validate class to define validation rules and scenes, create a simple HTML form for data submission, and process the input in a backend controller, providing complete code examples for each step.
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):
<?php
namespace app\index\validate;
use think\Validate;
class Vdate extends Validate{
// Each field corresponds to a rule (first layer)
protected $rule = [
["name","require|max:10","不能为空|分类名不能超过10个字符"],
["parent_id","number","必须为数字"],
];
// Validation scenes (second layer)
protected $scene = [
"save" => ["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:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>验证数据</title>
</head>
<body>
<form action="{:url('index/validateF')}" method="GET">
<input type="text" name="name">
<input type="submit" value="提交">
</form>
</body>
</html>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.
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