[整理]PHP/HTML混写的四种方式
PHP作为一款后端语言，为了输出给浏览器让浏览器呈现出来，无可避免的要输出HTML代码，下文介绍下我用过的三种PHP/HTML混编方法
1.单/双引号包围法
这是最初级的方法了，用法就像下面这样
1 <?php 2 echo ' 3 <!DOCTYPE html> 4 <html> 5 <head> 6 <title> </title> 7 </head> 8 <body> 9 <span>测试页面</span>10 </body>11 </html>12 ';13 ?>
这样是最简单的一种方法了，直接用单引号包装上就行了
至于双引号和单引号的区别，就在于前者解析引号内的变量，而后者不解析引号内的变量，参看下面的例子
1 <?php2 $Content='Hello!';3 echo "$Content";4 echo '<br>';5 echo '$Content';6 ?>
输出
1 Hello!2 $Content
由此可见，用双引号包围的字符串中的变量名自动解析为了变量值，而用单引号包围则依然显示变量名
这样书写的缺点有两点
1.如果输出内容中包含单/双引号将极难处理，因为PHP无法判断这个引号是属于程序的还是输出内容的，所以会报错
2.这样书写一些现代文本编辑器（如SublimeText）将无法对引号包围的输出的内容进行语法着色，如果出现一些格式问题将极难发现。图中为SublimeText3的一张截图，上面的是正常的着色，下面则是用引号包围的着色
2.使用HEREDOC/NOWDOC
HEREDOC和NOWDOC是PHP5.3开始支持的一种新特性，它允许在程序中使用一种自定义的标志符来包围文本，而HEREDOC和NOWDOC的关系就类似于双引号包围和单引号包围一样，前者解析区块内的变量，而后者不解析区块内的变量
下面介绍HEREDOC和NOWDOC的用法
1 <?php 2 $Content='Hello!'; 3 4 //下面写出了一个HEREDOC，其中标识LABEL可以自定义为任何字符串，但要保证开头的标识和结尾的标识一样 5 echo <<<LABEL 6 $Content 7 LABEL; 8 //结尾的方法：另起一行，打上LABEL。注意结尾的标识前面和后面不要插入任何字符，空格也不行 9 10 echo '<br>';//为了演示方便换行11 12 //NOWDOC和HEREDOC的书写方式差别在于NOWDOC的标识符需要用单引号包围13 echo <<<'LABEL'14 $Content15 LABEL;16 //其他无异17 18 19 ?>
也可以参考PHP.net上的关于这两个的wiki：https://wiki.php.net/rfc/heredoc-with-double-quotes
用HEREDOC/NOWDOC书写极好的解决了包围引号的问题，但依然没有解决语法着色失效的问题
3.HTML中嵌入PHP程序块（推荐）
这是一种非常合适的办法，并且这种方法广泛用在了诸如WordPress模板等场合中。书写起来也较为方便，直接在需要输出的地方写上相关的代码就行了，就像下面这样
1 <?php 2 3 //首先在这里写好相关的调用代码 4 function OutputTitle(){ 5 echo 'TestPage'; 6 } 7 function OutputContent(){ 8 echo 'Hello!'; 9 }10 11 //然后再下面调用相关函数就可以了12 ?>13 14 <!DOCTYPE html>15 <html>16 <head>17 <title><?php OutputTitle(); ?></title>18 </head>19 <body>20 <span><?php OutputContent(); ?></span>21 </body>22 </html>我认为这种方法是在这三种方法中最好的，但是这样做的缺点是如果这样的代码块一多了就会严重影响程序阅读。
4.使用前端模板引擎
由于前端的重要性在整个Web开发中日益上升，现在前/后端工程师逐渐在分离成两个职业，所以说为了确保前/后端工程师能够相互配合，使前端开发和后端开发出来的东西对接更完美，逐渐催生出了一系列前端模板引擎，比如Smarty。使用Smarty书写的实现代码可读性非常的高，这使前/后端的分离也更加的高效和便捷。有兴趣的同学可以去搜索了解
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1666
14
1426
52
1328
25
1273
29
1253
24
Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1?
Apr 17, 2025 am 12:06 AM
In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
How does PHP type hinting work, including scalar types, return types, union types, and nullable types?
Apr 17, 2025 am 12:25 AM
PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.
PHP vs. Other Languages: A Comparison
Apr 13, 2025 am 12:19 AM
PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
PHP and Python: Different Paradigms Explained
Apr 18, 2025 am 12:26 AM
PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.
