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Home Backend Development PHP Tutorial 这个while循环为什么要分开写呢?为什么不写在一个php标签里面?

这个while循环为什么要分开写呢?为什么不写在一个php标签里面?

Jun 06, 2016 pm 08:19 PM
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图片里这个 为什么while循环的开始的花括号那里就写了结束标记呢 后面的那个结束花括号又单独被php标签包含 while执行语句里面是独立的php标签 为什么要这样写呢? 把这些所有的都包含在一个 这样的标签里面不行吗 我经常看到这样的写法的 一点都不懂为什么要这样写 大家能给解释一下吗
这个while循环为什么要分开写呢?为什么不写在一个php标签里面?

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图片里这个 为什么while循环的开始的花括号那里就写了结束标记呢 后面的那个结束花括号又单独被php标签包含 while执行语句里面是独立的php标签 为什么要这样写呢? 把这些所有的都包含在一个 这样的标签里面不行吗 我经常看到这样的写法的 一点都不懂为什么要这样写 大家能给解释一下吗
这个while循环为什么要分开写呢?为什么不写在一个php标签里面?

一个是PHP代码,一个是HTML代码。如果把HTML代码写到PHP代码块里面需要用echo把HTML代码包裹起来。但这样写PHP解释器就会自动处理中间的HTML代码,省事很多,看着也清晰。

php与html混写的一种方式
要么以php文件的开始与结束符分隔
这种方式就是你所遇到的,碰到html的内容,无论是while还是for等等,只要碰到了,就得结束
要么把html作为php中的一个字符串

<code><?php while (condition) {
    echo "<div>***"
  }
?></code>
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php标签外面的文字会被当成文本处理,因此那个}就是php的一部分,跟第39行的while配对。
其实可以有一个更优雅的写法:替代语法

<code><?php while (xxx): ?>
    <div>some html code</div>
    <!-- 只有单一变量也可以按照下一行这么写 -->
    <div>value $_GET['a'] is =$_GET['a']?></div>
<?php endwhile; ?>
</code>
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对于iffor等语句,也有类似的替代语法。

模板的引入就是为了不要在代码里拼接html,那样是歪门邪道。

因为这是php里输出html啊

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