82 lines
2.2 KiB
Markdown
82 lines
2.2 KiB
Markdown
---
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title: 渲染页面
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---
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## 渲染页面
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```php
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$response = $kernel->handle(
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$request = Request::capture()
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)->send();
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```
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这里只需要分析这一行代码，它将请求对象`Request::capture()`捕获，并将其传递给内核对象`$kernel->handle()`，然后将响应对象返回。
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在`Laravel`中，`Request::capture()`方法会捕获当前的请求对象
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### send()方法
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`$response`是类`Symfony\Component\HttpFoundation\Response`实例，在该类中可以找到`send()`方法。
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```php
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public function send()
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{
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// 发送http响应头
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$this->sendHeaders();
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// 发送http响应内容
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$this->sendContent();
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if (\function_exists('fastcgi_finish_request')) {
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fastcgi_finish_request();
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} elseif (\function_exists('litespeed_finish_request')) {
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litespeed_finish_request();
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} elseif (!\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true)) {
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static::closeOutputBuffers(0, true);
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flush();
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}
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return $this;
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}
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```
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#### sendHeaders()方法
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当类`Symfony\Component\HttpFoundation\Response`实例化时，构造函数详细
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```php
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public function __construct(?string $content = '', int $status = 200, array $headers = [])
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{
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$this->headers = new ResponseHeaderBag($headers);
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$this->setContent($content);
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$this->setStatusCode($status);
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$this->setProtocolVersion('1.0');
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}
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public function sendHeaders()
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{
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// headers have already been sent by the developer
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if (headers_sent()) {
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return $this;
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}
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// 这里设置返回的响应头
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foreach ($this->headers->allPreserveCaseWithoutCookies() as $name => $values) {
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$replace = 0 === strcasecmp($name, 'Content-Type');
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foreach ($values as $value) {
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header($name.': '.$value, $replace, $this->statusCode);
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}
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}
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// cookies
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foreach ($this->headers->getCookies() as $cookie) {
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header('Set-Cookie: '.$cookie, false, $this->statusCode);
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}
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// status
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header(sprintf('HTTP/%s %s %s', $this->version, $this->statusCode, $this->statusText), true, $this->statusCode);
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return $this;
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}
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```
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#### sendContent()方法
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```php
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public function sendContent()
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{
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echo $this->content;
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return $this;
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}
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```
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