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graphql php实现

2026-02-28 12:56:28PHP

GraphQL PHP 实现指南

安装依赖

使用 Composer 安装 webonyx/graphql-php 包：

composer require webonyx/graphql-php

定义 Schema

创建 GraphQL Schema，包含类型定义和查询/变更操作：

use GraphQL\Type\Definition\ObjectType;
use GraphQL\Type\Definition\Type;
use GraphQL\Type\Schema;

$queryType = new ObjectType([
    'name' => 'Query',
    'fields' => [
        'hello' => [
            'type' => Type::string(),
            'resolve' => function () {
                return 'Hello World!';
            }
        ]
    ]
]);

$schema = new Schema(['query' => $queryType]);

处理请求

接收 HTTP 请求并执行 GraphQL 查询：

use GraphQL\GraphQL;
use GraphQL\Error\FormattedError;

$rawInput = file_get_contents('php://input');
$input = json_decode($rawInput, true);
$query = $input['query'];

try {
    $result = GraphQL::executeQuery($schema, $query);
    $output = $result->toArray();
} catch (\Exception $e) {
    $output = [
        'errors' => [FormattedError::createFromException($e)]
    ];
}

header('Content-Type: application/json');
echo json_encode($output);

高级类型定义

定义自定义对象类型和复杂字段：

$userType = new ObjectType([
    'name' => 'User',
    'fields' => [
        'id' => Type::id(),
        'name' => Type::string(),
        'email' => Type::string()
    ]
]);

$queryType->addField([
    'name' => 'user',
    'type' => $userType,
    'args' => [
        'id' => Type::nonNull(Type::id())
    ],
    'resolve' => function ($root, $args) {
        return getUserById($args['id']); // 实现数据获取逻辑
    }
]);

变更操作

实现数据修改操作：

$mutationType = new ObjectType([
    'name' => 'Mutation',
    'fields' => [
        'createUser' => [
            'type' => $userType,
            'args' => [
                'name' => Type::nonNull(Type::string()),
                'email' => Type::nonNull(Type::string())
            ],
            'resolve' => function ($root, $args) {
                return createNewUser($args); // 实现创建逻辑
            }
        ]
    ]
]);

$schema = new Schema([
    'query' => $queryType,
    'mutation' => $mutationType
]);

数据加载优化

使用 DataLoader 解决 N+1 查询问题：

use GraphQL\Executor\Promise\Adapter\ReactPromiseAdapter;
use GraphQL\Executor\Promise\Promise;

$loader = new DataLoader(function ($keys) {
    $users = batchLoadUsers($keys); // 批量加载逻辑
    return new Promise(function ($resolve) use ($users) {
        $resolve($users);
    });
}, new ReactPromiseAdapter());

$userType->addField([
    'name' => 'friends',
    'type' => Type::listOf($userType),
    'resolve' => function ($user) use ($loader) {
        return $loader->load($user['friendIds']);
    }
]);

错误处理

自定义错误格式和处理：

$result = GraphQL::executeQuery($schema, $query)
    ->setErrorFormatter(function (GraphQL\Error\Error $error) {
        return [
            'message' => $error->getMessage(),
            'locations' => $error->getLocations(),
            'code' => $error->getCode()
        ];
    });

中间件支持

通过中间件处理请求：

$middleware = function ($schema, $query, $variables, $context) {
    // 前置处理逻辑
    $result = GraphQL::executeQuery($schema, $query, null, $context, $variables);
    // 后置处理逻辑
    return $result;
};

性能监控

添加查询复杂度分析：

use GraphQL\Validator\Rules\QueryComplexity;
use GraphQL\Validator\DocumentValidator;

$rule = new QueryComplexity(100); // 设置最大复杂度
DocumentValidator::addRule($rule);

graphql php实现