* 在array_map()函数中使用闭包
<?php
$numbersPlusOne = array_map(function($number) {
return $number + 1;
}, [1,2,3]);
print_r($numbersPlusOne);
$ php numbersPlusOne.php
Array
(
[0] => 2
[1] => 3
[2] => 4
)
* 使用use关键字附加闭包的状态
<?php
function enclosePerson($name) {
// use 可以把多个参数传入闭包
return function($doCommand) use ($name) {
return sprintf('%s, %s'.PHP_EOL, $name, $doCommand);
};
}
$clay = enclosePerson('Clay');
echo $clay('get me some sweet tea!');
Clay, get me some sweet tea!
* 使用bindTo方法附加闭包的状态
<?php
class App {
protected $routes = [];
protected $responseStatus = '200 OK';
protected $responseContentType = 'text/html';
protected $responseBody = 'Hello world';
public function addRoute($routePath, $routeCallBack) {
$this->routes[$routePath] = $routeCallBack->bindTo($this, __CLASS__);
}
public function dispatch($currrentPath) {
foreach ($this->routes as $routePath => $callback) {
if ($routePath === $currrentPath) {
$callback();
}
}
header('HTTP/1.1 ', $this->responseStatus);
header('Content-Type: ', $this->responseContentType);
header('Content-length: ', mb_strlen($this->responseBody));
echo $this->responseBody;
}
}
$app = new App();
$app->addRoute('/users/josh', function() {
$this->responseContentType = 'application/json; charset=utf8';
$this->responseBody = '{"name": "Josh"}';
});
$app->dispatch('/users/josh');
echo PHP_EOL;
// {"name": "Josh"}