What do the tags in php language mean?

Tags in programming languages ​​are strings added to the source code for identification. Most languages ​​treat tags as identifiers, followed by a colon for identification.

In PHP we use <?php to indicate the beginning of the PHP identifier, then put the PHP statement and add a terminating identifier ?>To exit PHP mode.

You can turn PHP mode on or off in the HTML file like this according to your needs.

Most embedded scripting languages ​​are embedded in HTML and used together with HTML, such as CSS, JavaScript, PHP, ASP and JSP. (Recommended: "PHP Tutorial")

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 以<?php开始和以?>结束标记是标准风格，这是PHP推荐使用的标记风格。
 
 以<script language="php">开始和<script>结束是长风格标记，这种标记最长，总是可用的，但我们并不常用。
 
 以<?开始和以?>结束标记是简短风格的标记，是最简单的，但是系统管理员偶尔会禁用掉它，因为它会干扰XML文档的声明。只用通过php.ini配置文件中的指令short_open_tag打开后就可以使用。
 
 以<%开始和以%>结束标记是ASP风格的标记，可以在php.ini配置文件设定中启用了asp_tags选项就可以使用它（默认是禁用的），习惯了ASP风格的可以使用它。

Recommended to use

<?php ?> ;

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