Build a template engine instance of PHP framework

Since came to the new company has been very busy, recently this period of time finally a little idle, hurriedly continue to write this series, feel no longer write on the rotten tail.

As we said before, when we get this piece of {{ $name }} content, we just need to convert it <?php echo $name ?> so that we can recognize it and output the corresponding variable value.

That would require a regular match {{ $name }} , and then replace and replace them with {{ }} each <?php echo other ?> .

But to think of a problem, if I write PHP code in the view, which contains {{ $name }} , it will be replaced. Examples are as follows:

<?php$name = ' Test '; $str = "{$name}}";? >

To solve this problem, we need to remove the PHP code, leaving only the HTML code to do the replacement processing. Fortunately PHP has a method Token_get_all, will be provided by the PHP tag to split the content. Use this method to parse the following:

$content = <<<view<?php\ $name = ' test '; \ $str = ' {{\ $name}} ';? >
Here the $ symbol before plus \ is for the transfer, which is not needed in the real reality. The results are as follows:

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] = Arra    Y ([0] = 323 [1] = ' Test ' [2] = 2) [5] = =; [6] = = Array ([0] = 382 [1] = [2] = 2) [7] = = [ 8] = = Array ([0] = 382 [1] = [2] = 3) [9] = = "[1] 0] = = Array ([0] = 322 [1] = = {{[2] = 3) [One] = ARR        Ay ([0] = [1] = $name [2] = 3) [] = = Array     ([0] = 322       [1] + =}} [2] = 3) [[] = [+] =; [+] = Array ([0] = 382 [1] = [2] = 3) [+] = Arra        Y ([0] = 381 [1] =?> [2] = 4) [+] = = Array ([0] = 321 [1] =>
You can see that the PHP-related code is parsed, we just need to determine the HTML code, and then replace it. 321 is the value of the defined constant T_INLINE_HTML , and the markup parses the HTML code.

We define the view file with the suffix SF, then we can create the file in the controller/model/view directory, the view.sf content is as follows

<?php$title = ' It is a title '; $str = ' {{$title}} ';? >
And then we're going to change the Controller method in the render code below

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 '?> ', $content);            }            $result. = $content;        } else {            $result. = $token;        }    }    $generatedFile = '. /runtime/cache/'. MD5 ($file);    File_put_contents ($generatedFile, $result);    Extract ($params);    Require_once $generatedFile;}
Modify the actionView following

Public Function Actionview () {$this->render (' Site/view ', [' body ' = ' Test body information ']);}
Visit Http://localhost/simple-framework/public/index.php?r=site/view to get the following page

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