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PHP教程 基本语法_php基础

May 17, 2016 am 09:02 AM
php basic grammar

PHP 的脚本块以 结束。您可以把 PHP 的脚本块放置在文档中的任何位置。
当然,在支持简写的服务器上,您可以使用 和 ?> 来开始和结束脚本块。
不过,为了达到最好的兼容性,我们推荐您使用标准形式 (

复制代码 代码如下:

?>

PHP 文件通常会包含 HTML 标签,就像一个 HTML 文件,以及一些 PHP 脚本代码。
在下面,我们提供了一段简单的 PHP 脚本,它可以向浏览器输出文本 "Hello World":
复制代码 代码如下:



echo "这是PHP教程网!";
?>



PHP 中的每个代码行都必须以分号结束。分号是一种分隔符,用于把指令集区分开来。
有两种通过 PHP 来输出文本的基础指令:echo 和 print。在上面的例子中,我们使用了 echo 语句来输出文本。
PHP 中的注释
在 PHP 中,我们使用 // 来编写单行注释,或者使用 /* 和 */ 来编写大的注释块。
复制代码 代码如下:



//这是一个注释
/*
这是大的注释,
可以注释多行
*/
echo "test string1";
echo "
"; //这里添加"
"是为了在Web页面上生成新的一行,即换行
echo "
";
//echo "test string2
";
//echo "test string3
";
echo "test string4
";
?>


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