PHP中Heredoc

在网页开发过程中，经常发现在html代码中出现php代码，但是加了一些代码： 1 !-- 2 EOT; 3 if($tmpCount==$db_txtadnum){ 4 $tmpCount=0;print EOT 5 -- 6 / tr 7 !-- 8 EOT; 9 }}if($tmpCount $tmpCount$db_txtadnum){ 10 for($i=$tmpCount;$i$db_txtadnum;

在网页开发过程中，经常发现在html代码中出现php代码，但是加了一些代码：

<span> 1</span> <span><!--</span>
<span> 2</span> <span>EOT;
</span><span> 3</span> <span>if($tmpCount==$db_txtadnum){
</span><span> 4</span> <span>$tmpCount=0;print <<<EOT
</span><span> 5</span> <span>--></span>
<span> 6</span>         <span></span><span>tr</span><span>></span>
<span> 7</span> <span><!--</span>
<span> 8</span> <span>EOT;
</span><span> 9</span> <span>}}if($tmpCount && $tmpCount<$db_txtadnum){
</span><span>10</span> <span>for($i=$tmpCount;$i<$db_txtadnum;$i++){print <<<EOT
</span><span>11</span> <span>--></span>
<span>12</span>             <span><span>td </span><span>width</span><span>="$idp%"</span><span>></span><span> </span><span></span><span>td</span><span>></span>
<span>13</span> <span><!--</span>
<span>14</span> <span>EOT;
</span><span>15</span> <span>}print <<<EOT
</span><span>16</span> <span>--></span></span>

开始不知道为什么会这样，可能是在html中有php代码，实现以下判断，以控制页面的显示吧，但是今天在整理以前的任务时，发现了一个叫heredoc技术的东西，特意总结一下：

Heredoc技术，在正规的PHP文档中和技术书籍中一般没有详细讲述，只是提到了这是一种Perl风格的字符串输出技术。但是现在的一些论坛程序，和部分文章系统，都巧妙的使用heredoc技术，来部分的实现了界面与代码的准分离，phpwind模板就是一个典型的例子。 

<span> 1</span> <span>php 
</span><span> 2</span> <span>$name</span> = '浅水游'<span>;
</span><span> 3</span> <span>print</span> EOT
<span> 4</span> 
<span> 5</span>  
<span> 6</span>  
<span> 7</span> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> 
<span> 8</span> <title>Untitled Document</title> 
<span> 9</span>  
<span>10</span>  
<span>11</span> <!--12321--> 
<span>12</span> Hello,<span>$name</span>! 
<span>13</span>  
<span>14</span> 
<span>15</span> 
<span>16</span> <span>EOT;
</span><span>17</span> ?>

1.浠