Scope::finally
(PHP 8.6+, True Async 1.0)
public function finally(\Closure $callback): void
注册一个在作用域完成时执行的回调函数。这相当于作用域的 finally 块，保证无论作用域如何结束（正常完成、被取消或出现错误），清理代码都会运行。
参数
callback — 作用域完成时将被调用的闭包。
返回值
没有返回值。
示例
示例 #1 资源清理
<?php
use Async\Scope;
$scope = new Scope();
$scope->finally(function() {
echo "Scope completed, cleaning up resources\n";
// Close connections, delete temporary files
});
$scope->spawn(function() {
echo "Executing task\n";
});
$scope->awaitCompletion();
// Output: "Executing task"
// Output: "Scope completed, cleaning up resources"
示例 #2 多个回调
<?php
use Async\Scope;
$scope = new Scope();
$scope->finally(function() {
echo "Closing database connection\n";
});
$scope->finally(function() {
echo "Writing metrics\n";
});
$scope->spawn(function() {
\Async\delay(1000);
});
$scope->dispose();
// Both callbacks will be invoked when the scope completes
参见
- Scope::dispose — 关闭作用域
- Scope::isFinished — 检查作用域是否已完成
- Coroutine::finally — 协程完成时的回调