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PHP 标记风格
      当解析一个文件时,PHP 会寻找起始和结束标记,也就是 ,这告诉 PHP 开始和停止解析二者之间的代码。此种解析方式使得 PHP 可以被嵌入到各种不同的文档中去,而任何起始和结束标记之外的部分都会被 PHP 解析器忽略。 
      PHP 也允许使用短标记 和 ?>,但不鼓励使用。只有通过激活 php.ini 中的 short_open_tag 配置指令或者在编译 PHP 时使用了配置选项 --enable-short-tags 时才能使用短标记。 

      如果文件内容是纯 PHP 代码,最好在文件末尾删除 PHP 结束标记。这可以避免在 PHP 结束标记之后万一意外加入了空格或者换行符,会导致 PHP 开始输出这些空白,而脚本中此时并无输出的意图。

 // standard tags-建议使用
?>        // short tags, need short_open_tag enabled in php.ini
     // asp tags, need asp_tags enabled in php.ini
// Script

<?php echo "标准标记<p>";?><script language="php">	echo "脚本风格";</script>

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