Summary of four ways to mix PHP/HTML-PHP Tutorial-php.cn

Summary of four ways to mix PHP/HTML

墨辰丷

Release： 2023-03-27 22:12:02

Original

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The following editor will bring you a summary of four methods of PHP/HTML mixed writing. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look.

PHP is a back-end language. In order to output it to the browser for the browser to display, it is inevitable to output HTML code. The following is an introduction to the three methods I have used. A PHP/HTML hybrid method

1. Single/double quotation mark enclosing method

This is the most basic method. The usage is like As follows

<?php
 echo &#39;
 <!DOCTYPE html>
 <html>
   <head>
     <title> </title>
   </head>
   <body>
     <span>测试页面</span>
   </body>
 </html>
 &#39;;
?>

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This is the simplest method, just wrap it in single quotes

As for double quotes and single quotes The difference between quotation marks is that the former parses the variables within the quotation marks, while the latter does not parse the variables within the quotation marks. See the following example

<?php
 $Content=&#39;Hello!&#39;;
 echo "$Content";
 echo &#39;<br>&#39;;
 echo &#39;$Content&#39;;
 ?>

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Output

1 Hello!
2 $Content

It can be seen that the variable name in the string surrounded by double quotes is automatically parsed into the variable value. If surrounded by single quotes, the variable name will still be displayed

There are two disadvantages to writing this way

1. If the output content contains the single / Double quotation marks will be extremely difficult to deal with, because PHP cannot determine whether the quotation mark belongs to the program or the output content, so an error will be reported

2. Some modern text editors (such as SublimeText) will not be able to write in this way. The output content is syntax colored, making it extremely difficult to detect any formatting problems. The picture is a screenshot of SublimeText3. The top one is the normal coloring, and the bottom one is the coloring surrounded by quotes

2. Use HEREDOC/ NOWDOC

##HEREDOC and NOWDOC are a new feature that PHP5.3 began to support. It allows the use of a custom identifier to surround text in the program, while HEREDOC and NOWDOC The relationship is similar to that between double quotes and single quotes.

The former parses the variables in the block, while the latter does not parse the variables in the block

Introduced below The usage of HEREDOC and NOWDOC

<?php
 $Content=&#39;Hello!&#39;;
  
 //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
 echo <<<LABEL
 $Content
 LABEL;
 //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
  
 echo &#39;<br>&#39;;//为了演示方便换行
  
 //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
 echo <<<&#39;LABEL&#39;
 $Content
 LABEL;
 //其他无异
  
 ?>

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You can also refer to the wiki about these two on PHP.net: https://wiki .php.net/rfc/heredoc-with-double-quotes

Writing with HEREDOC/NOWDOC perfectly solves the problem of surrounding quotation marks, but it still does not solve the problem of invalid syntax coloring

3. Embed PHP program blocks in HTML (recommended)

This is a very suitable method, and this method is widely used in applications such as WordPress templates and other occasions. It is also more convenient to write. Just write the relevant code directly where it needs to be output, as follows

<?php
  
 //首先在这里写好相关的调用代码
 function OutputTitle(){
   echo &#39;TestPage&#39;;
 }
 function OutputContent(){
   echo &#39;Hello!&#39;;
 }
  
 //然后再下面调用相关函数就可以了
 ?>
  
 <!DOCTYPE html>
 <html>
   <head>
     <title><?php OutputTitle(); ?></title>
   </head>
   <body>
     <span><?php OutputContent(); ?></span>
   </body>
 </html>

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I think this method is The best of these three methods, but the disadvantage of this is that if there are too many such code blocks, it will seriously affect program reading.

4. Use front-end template engine

As the importance of front-end is increasing day by day in the entire web development, now front-end/back-end engineers are gradually After being separated into two professions, in order to ensure that front-end/back-end engineers can cooperate with each other and make the things developed by front-end development and back-end development more perfect, a series of front-end template engines have gradually been spawned, such as Smarty. The implementation code written using Smarty is very readable, which makes the separation of front/back end more efficient and convenient. Interested students can search and learn about

. The above is the entire content of this article. I hope it will be helpful to everyone's study.

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