Build a PHP framework and build a template engine instance
自从来到新公司就一直很忙，最近这段时间终于稍微闲了一点，赶紧接着写这个系列，感觉再不写就烂尾了。
之前我们说到，拿到{{ $name }}这样一段内容时，我们只需要将它转化成<?php echo $name ?>这样，就可以识别了，输出相应的变量值。
那就要需要正则匹配{{ $name }}，然后替换掉{{和}}，分别替换成<?php echo和?>。
但是要想到一个问题，如果我在 view 里写了 php 的代码，其中含有{{ $name }}，也会被替换。例子如下：
<?php$name = 'test';$str = "{{ $name }}";?>要解决这个问题，我们需要将 PHP 的代码去掉，只留下 html 代码再做替换的处理。幸好 PHP 有一个方法 token_get_all，会将提供的内容按 PHP 标记进行分割。使用此方法解析如下内容：
$content = <<<VIEW<?php\$name = 'test';\$str = "{{ \$name }}";?><html> <body>{{ \$name }}</body><html>VIEW;print_r(token_get_all($content));这里$符号前加\是为了转移，在真正是现实不需要。结果如下：
Array
(
[0] => Array
(
[0] => 379
[1] => <?php
[2] => 1
)
[1] => Array
(
[0] => 382
[1] =>
[2] => 2
)
[2] => =
[3] => Array
(
[0] => 382
[1] =>
[2] => 2
)
[4] => Array
(
[0] => 323
[1] => 'test'
[2] => 2
)
[5] => ;
[6] => Array
(
[0] => 382
[1] =>
[2] => 2
)
[7] => =
[8] => Array
(
[0] => 382
[1] =>
[2] => 3
)
[9] => "
[10] => Array
(
[0] => 322
[1] => {{
[2] => 3
)
[11] => Array
(
[0] => 320
[1] => $name
[2] => 3
)
[12] => Array
(
[0] => 322
[1] => }}
[2] => 3
)
[13] => "
[14] => ;
[15] => Array
(
[0] => 382
[1] =>
[2] => 3
)
[16] => Array
(
[0] => 381
[1] => ?>
[2] => 4
)
[17] => Array
(
[0] => 321
[1] =>
<html>
<body>{{ $name }}</body>
<html>
[2] => 5
)
)可以看到 PHP 相关的代码被解析了，我们只需要判断出是 html 代码，然后做替换就可以了。其中的321就是定义好的常量T_INLINE_HTML的值，标记解析出来的就是 html 代码。
我们定义view文件的后缀为sf，那我们就可以在controller/model/view目录下创建view.sf文件，内容如下
<?php$title = 'It is a title';$str = "{{ $title }}";?><html>
<head>
<title>{{ $title }}</title>
<head>
<body>
<h2>{{ $str }}</h2>
<p>{{ $body }}<p>
</body>
</html>然后我们来改造Controller中的render方法，代码如下
public function render($view, $params = [])
{
$file = '../views/' . $view . '.sf';
$fileContent = file_get_contents($file);
$result = '';
foreach (token_get_all($fileContent) as $token) {
if (is_array($token)) {
list($id, $content) = $token;
if ($id == T_INLINE_HTML) {
$content = preg_replace('/{{(.*)}}/', '<?php echo $1 ?>', $content);
}
$result .= $content;
} else {
$result .= $token;
}
}
$generatedFile = '../runtime/cache/' . md5($file);
file_put_contents($generatedFile, $result);
extract($params);
require_once $generatedFile;
}修改actionView如下
public function actionView(){$this->render('site/view', ['body' => 'Test body information']);}访问 http://localhost/simple-framework/public/index.php?r=site/view ，得到如下页面
今天就先到这里。项目内容和博客内容也都会放到Github上，欢迎大家提建议。
code：
blog project：
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