From 5c86bf39f1ae3f35d08dea6b8184deaa7981fad6 Mon Sep 17 00:00:00 2001
From: tianfenghan <rango@swoole.com>
Date: Mon, 25 May 2026 22:34:07 +0800
Subject: [PATCH] =?UTF-8?q?feat(examples):=20=E6=B7=BB=E5=8A=A0=20PHP=20?=
 =?UTF-8?q?=E5=8F=8D=E5=B0=84=20API=20=E7=A4=BA=E4=BE=8B=E7=A8=8B=E5=BA=8F?=
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- 实现了打印内置函数参数和返回值类型信息的功能
- 添加了打印用户自定义函数信息的支持
- 实现了打印类方法参数和返回值类型信息的功能
- 添加了打印闭包(Closure)信息的支持
- 提供了完整的反射细节打印功能
- 支持联合类型、交集类型等复杂类型格式化
- 包含了 tentative return type 的
---
 examples/ref/reflection_demo.php | 296 +++++++++++++++++++++++++++++++
 1 file changed, 296 insertions(+)
 create mode 100644 examples/ref/reflection_demo.php

diff --git a/examples/ref/reflection_demo.php b/examples/ref/reflection_demo.php
new file mode 100644
index 00000000..905e9a05
--- /dev/null
+++ b/examples/ref/reflection_demo.php
@@ -0,0 +1,296 @@
+<?php
+
+/**
+ * PHP 反射 API 示例 - 打印函数的参数和返回值类型信息
+ */
+
+// ============================================================
+// 1. 打印内置函数的信息 (展示 Tentative Return Type)
+// ============================================================
+echo "===== 1. 内置函数: fopen =====" . PHP_EOL;
+printFunctionReflection('random_bytes');
+echo PHP_EOL;
+
+echo "===== 1b. 内置方法: DateTime::format(展示 tentative return type) =====" . PHP_EOL;
+printMethodReflection(\DateTime::class, 'format');
+echo PHP_EOL;
+
+// ============================================================
+// 2. 打印用户自定义函数的信息
+// ============================================================
+
+/**
+ * 计算两个数的和
+ */
+function add(int $a, int $b): int
+{
+    return $a + $b;
+}
+
+/**
+ * 连接字符串和数组
+ */
+function concat(string $prefix, array $items, string $separator = ', '): string
+{
+    return $prefix . implode($separator, $items);
+}
+
+/**
+ * 返回一个对象或 null
+ */
+function findUser(int $id): ?stdClass
+{
+    return null;
+}
+
+/**
+ * 无返回值函数
+ */
+function logMessage(string $message): void
+{
+    echo "[LOG] $message" . PHP_EOL;
+}
+
+/**
+ * 可变参数 + 联合类型
+ */
+function sum(int|float ...$numbers): int|float
+{
+    return array_sum($numbers);
+}
+
+echo "===== 2. 自定义函数: add =====" . PHP_EOL;
+printFunctionReflection('add');
+echo PHP_EOL;
+
+echo "===== 3. 自定义函数: concat =====" . PHP_EOL;
+printFunctionReflection('concat');
+echo PHP_EOL;
+
+echo "===== 4. 自定义函数: findUser =====" . PHP_EOL;
+printFunctionReflection('findUser');
+echo PHP_EOL;
+
+echo "===== 5. 自定义函数: logMessage =====" . PHP_EOL;
+printFunctionReflection('logMessage');
+echo PHP_EOL;
+
+echo "===== 6. 自定义函数: sum(可变参数+联合类型) =====" . PHP_EOL;
+printFunctionReflection('sum');
+echo PHP_EOL;
+
+// ============================================================
+// 3. 打印类方法的信息
+// ============================================================
+
+class Calculator
+{
+    /**
+     * 除法运算
+     */
+    public function divide(float $a, float $b): float|false
+    {
+        if ($b == 0) {
+            return false;
+        }
+        return $a / $b;
+    }
+
+    /**
+     * 批量计算
+     */
+    public static function batchCalculate(array $operations): array
+    {
+        return $operations;
+    }
+}
+
+echo "===== 7. 类方法: Calculator::divide =====" . PHP_EOL;
+printMethodReflection('Calculator', 'divide');
+echo PHP_EOL;
+
+echo "===== 8. 类方法: Calculator::batchCalculate(static) =====" . PHP_EOL;
+printMethodReflection('Calculator', 'batchCalculate');
+echo PHP_EOL;
+
+// ============================================================
+// 4. 打印闭包(Closure)的信息
+// ============================================================
+echo "===== 9. 闭包(Closure) =====" . PHP_EOL;
+$closure = function (string $name, int $age = 18): string {
+    return "Name: $name, Age: $age";
+};
+printFunctionReflection($closure);
+echo PHP_EOL;
+
+// ============================================================
+// 辅助函数
+// ============================================================
+
+/**
+ * 打印函数的参数和返回值类型信息
+ *
+ * @param ReflectionFunction|Closure|string $function 函数名、闭包或 ReflectionFunction 对象
+ */
+function printFunctionReflection(Closure|string $function): void
+{
+    try {
+        $ref = new ReflectionFunction($function);
+        printReflectionDetails($ref);
+    } catch (ReflectionException $e) {
+        echo "  [错误] " . $e->getMessage() . PHP_EOL;
+    }
+}
+
+/**
+ * 打印类方法的参数和返回值类型信息
+ *
+ * @param string $className  类名
+ * @param string $methodName 方法名
+ */
+function printMethodReflection(string $className, string $methodName): void
+{
+    try {
+        $ref = new ReflectionMethod($className, $methodName);
+        printReflectionDetails($ref);
+    } catch (ReflectionException $e) {
+        echo "  [错误] " . $e->getMessage() . PHP_EOL;
+    }
+}
+
+/**
+ * 打印反射细节（通用，适用于 ReflectionFunction / ReflectionMethod）
+ */
+function printReflectionDetails(ReflectionFunctionAbstract $ref): void
+{
+    // 名称
+    $name = $ref instanceof ReflectionMethod
+        ? $ref->getDeclaringClass()->getName() . '::' . $ref->getName()
+        : $ref->getName();
+    echo "  名称: {$name}" . PHP_EOL;
+
+    // 是否内置
+    echo "  类型: " . ($ref->isInternal() ? '内置函数' : '用户自定义') . PHP_EOL;
+
+    // 是否为静态方法
+    if ($ref instanceof ReflectionMethod) {
+        echo "  静态: " . ($ref->isStatic() ? '是' : '否') . PHP_EOL;
+    }
+
+    // 是否为可变参数
+    echo "  可变参数: " . ($ref->isVariadic() ? '是' : '否') . PHP_EOL;
+
+    // 参数信息
+    $params = $ref->getParameters();
+    echo "  参数个数: " . count($params) . PHP_EOL;
+
+    foreach ($params as $i => $param) {
+        echo "    参数 #{$i}: \${$param->getName()}" . PHP_EOL;
+
+        // 类型
+        $type = $param->getType();
+        if ($type) {
+            echo "      类型: " . formatType($type) . PHP_EOL;
+        } else {
+            echo "      类型: (未声明)" . PHP_EOL;
+        }
+
+        // 默认值
+        if ($param->isDefaultValueAvailable()) {
+            $defaultValue = $param->getDefaultValue();
+            echo "      默认值: " . formatDefaultValue($defaultValue) . PHP_EOL;
+        }
+
+        // 是否为可变参数
+        if ($param->isVariadic()) {
+            echo "      (可变参数)" . PHP_EOL;
+        }
+
+        // 是否可为 null
+        if ($type && $type->allowsNull()) {
+            echo "      允许 null: 是" . PHP_EOL;
+        }
+
+        // 是否为引用传递
+        if ($param->isPassedByReference()) {
+            echo "      引用传递: 是" . PHP_EOL;
+        }
+    }
+
+    // 返回值类型
+    $returnType = $ref->getReturnType();
+    if ($returnType) {
+        echo "  返回值类型: " . formatType($returnType) . PHP_EOL;
+    } else {
+        echo "  返回值类型: (未声明)" . PHP_EOL;
+    }
+
+    // Tentative Return Type (PHP 8.0+，主要用于内置函数/方法)
+    $tentativeReturnType = $ref->getTentativeReturnType();
+    if ($tentativeReturnType) {
+        echo "  Tentative 返回值类型: " . formatType($tentativeReturnType) . PHP_EOL;
+        echo '  说明: 这是 PHP 8.0+ 为旧版内置函数/方法添加的【暂定返回值类型】，不强制要求继承类或用户代码实现' . PHP_EOL;
+    } else {
+        echo "  Tentative 返回值类型: (未声明)" . PHP_EOL;
+    }
+}
+
+/**
+ * 格式化类型信息（支持联合类型、交集类型等）
+ */
+function formatType(ReflectionType $type): string
+{
+    if ($type instanceof ReflectionUnionType) {
+        $types = [];
+        foreach ($type->getTypes() as $t) {
+            $types[] = formatNamedType($t);
+        }
+        return implode(' | ', $types);
+    }
+
+    if ($type instanceof ReflectionIntersectionType) {
+        $types = [];
+        foreach ($type->getTypes() as $t) {
+            $types[] = formatNamedType($t);
+        }
+        return implode(' & ', $types);
+    }
+
+    if ($type instanceof ReflectionNamedType) {
+        return formatNamedType($type);
+    }
+
+    return (string)$type;
+}
+
+/**
+ * 格式化命名类型
+ */
+function formatNamedType(ReflectionNamedType $type): string
+{
+    $prefix = $type->allowsNull() && $type->getName() !== 'mixed' ? '?' : '';
+    return $prefix . $type->getName();
+}
+
+/**
+ * 格式化默认值显示
+ */
+function formatDefaultValue(mixed $value): string
+{
+    if ($value === null) {
+        return 'null';
+    }
+    if (is_bool($value)) {
+        return $value ? 'true' : 'false';
+    }
+    if (is_string($value)) {
+        return "'{$value}'";
+    }
+    if (is_array($value)) {
+        return '[]';
+    }
+    if (is_float($value)) {
+        return var_export($value, true);
+    }
+    return (string)$value;
+}