是否可以获取树枝模板中使用的所有变量
例如：在模板上
<!DOCTYPE html>
<html>
<head>
<title>My Webpage</title>
</head>
<body>
<ul id="navigation">
{% for item in navigation %}
<li><a href="{{ item.href }}">{{ item.caption }}</a></li>
{% endfor %}
</ul>
<h1>My Webpage</h1>
{{ a_variable }}
</body>
</html>
现在我需要将上面使用的所有变量作为数组获取，例如
Array(1=>'navigation',2=>'a_variable')
最好是twig本身能解决
Yo dawg，我听说你喜欢 Twig，所以我写了一个正则表达式，这样你就可以在解析时进行解析：
regex
\{\{(?!%)\s* # Starts with {{ not followed by % followed by 0 or more spaces
((?:(?!\.)[^\s])*) # Match anything without a point or space in it
\s*(?<!%)\}\} # Ends with 0 or more spaces not followed by % ending with }}
| # Or
\{%\s* # Starts with {% followed by 0 or more spaces
(?:\s(?!endfor)(\w+))+ # Match the last word which can not be endfor
\s*%\} # Ends with 0 or more spaces followed by %}
# Flags: i: case insensitive matching | x: Turn on free-spacing mode to ignore whitespace between regex tokens, and allow # comments.
PHP
$string = '<!DOCTYPE html>
<html>
<head>
<title>My Webpage</title>
</head>
<body>
<ul id="navigation">
{% for item in navigation %}
<li><a href="{{ item.href }}">{{ item.caption }}</a></li>
{% endfor %}
</ul>
<h1>My Webpage</h1>
{{ a_variable }}
</body>
</html>';
preg_match_all('/\{\{(?!%)\s*((?:(?!\.)[^\s])*)\s*(?<!%)\}\}|\{%\s*(?:\s(?!endfor)(\w+))+\s*%\}/i', $string, $m);
$m = array_map('array_filter', $m); // Remove empty values
array_shift($m); // Remove first index [0]
print_r($m); // Print results
Regex online demo http://regex101.com/r/jG8pU1 PHP online demo http://viper-7.com/qMrbBK
Note: This is just a POC http://en.wikipedia.org/wiki/Proof_of_concept and is never meant to be used on production.
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