基本的 PHP 语法 (Syntax)
如果你要在网页里写一段 PHP 代码，你应以 为结束。
<?php?>
在支持简写的服务器上，你可以使用 和 ?> 来开始和结束 PHP 脚本块。
<??>
为了保证你的 PHP 文件能够在不同环境下正常运行，强烈建议你使用第一种方法。即以 结束。
一个简单的 PHP 文件的例子你可以用 Notepad 编写如下代码，这就是一个最简单的 PHP 文件。
<html><body><?php echo "Blabla.cn" ?></body></html>
其中的 echo 是 PHP 最常用的函数之一，作用是输出文本。
保存 PHP 文件PHP 文件以 .php 作为文件扩展名。
比如你可以将上面的例子保存为 blabla.php。
运行 PHP 示例文件在浏览器里输入上述 PHP 示例文件的 URL 路径，你会看到显示的结果是：
Blabla.cn
请用浏览器查看该示例网页源代码，你会发现，你看不到上面示例文件中写的 PHP 代码，你看到的只是 PHP 脚本执行后形成的 HTML ，如下所示：
<html><body>Blabla.cn</body></html>
用户看不到 PHP 文件的源代码，只能看到 PHP 文件执行后的输出结果。
PHP 语言中分号 (Semicolon) 的作用: 指令分隔符 (Instruction separation)PHP 语言中，分号 (Semicolon) 表示一个 PHP 指令的结束，记住在每个 PHP 指令结束后加上分号，不过在一个 PHP 脚本块中，最后一个指令后可以不必加分号，因为 ?> 自动暗含了一个分号，当然你加分号也不会出错。
比如我们用分号分隔两个 echo 语句，如下：
<html><body><?phpecho "Blabla.cn";echo "Hello"?></body></html>空格
空格在两个 PHP 指令之间是被忽略的。
下面三种写法，输出 HTML 结果是一样的。
<?phpecho "Blabla.cn";echo "Hello"?>
<?phpecho "Blabla.cn";echo "Hello"?>
<?phpecho "Blabla.cn";echo "Hello"?>
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