本文章来给大家介绍PHP MVC框架视图学习笔记,以方便以后需要参考.今天来讲讲view,视图...没了解之前,你可能觉得模板引擎很神奇,了解了之后你会觉得,原来是如此简单...
对于模板引擎而言,它的原理一般是这样,把模板引擎的语言替换成可执行的语言,然后把变量输出...因为PHP本身就是一个良好了模板引擎,所以用原生的模板引擎是灰常方便和容易做到的...
index.html实例代码如下:
<html>
<head>
<title><?php echo $title ?></title>
</head>
<body>
<h1><?php echo $content ?></h1>
<?php if( ! emptyempty($arr)) {
<ul>
<?php foreach($arr as $value) { ?>
<li><?php echo $value ?></li>
<?php } ?>
</ul>
<?php } ?>
</body>
</html>想上面这样一个html页面,采用的就是原生的php模板引擎,服务器在你include这个页面时,会处理html中的PHP代码.
你也许会问,要是我想定制模板语言可以吗？答案当然是可以的,像我上面说的,用模板引擎的语言,只需要多做一步,就是把模板引擎的语言替换成标准的PHP语言...
index_2.html实例代码如下:
<html> <head> <title><?php echo $title ?></title> </head> <body> <h1><?php echo $content ?></h1> <ifexist arr> <ul> <for value = arr> <li><echo value></li> <endfor> </ul> <endexist> </body> </html>
看看这个页面,发现和index.html 有什么不同吗,没错,就是在循环那里,我们用的不是标准的php语言,而是,按照自己的喜好,定义了几个模板语言,一个是
实例代码如下:
$pattern = array(
'/<ifexists+(\w+)>/i',
'/<fors+(\w+)s=s(\w+)>/',
'/<echos+(\w+)>/'
);
$replacement = array(
'<?php if( ! emptyempty($\1)){ ',
'<?php foreach($\2 as $\1){ ',
'<?php echo $\1 '
);
$content = preg_replace($pattern, $replacement, $content);
$search = array('<endexist>', '<endfor>');
$content = str_replace($search, '<?php } ?>', $content);上面的正则就可以帮我们把刚刚定义的标签,转换成标准p hp语言...转换之后是这样,请看图.
转换之后可以输出了吗？答案是不行的,因为你获取到html文件的内容的时候,php就已经解释了,那时候你还没替换成标准的php语言,所以,你现在输出的话,其中的php代码就没有执行...不过我们可以利用 php eval 这个函数,来强制要求执行其中的代码.
实例代码如下:
$content = eval(' ?>'.$content);
注意哦,要 ?>.$content 要不,php会把其中的html当成是php代码的执行,这样就会出错了...刷新一下,ok,已经可以执行了~~~
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