Summary of ways to mix PHP and HTML

The following is a summary of how to mix PHP and HTML. The content is quite good, so I will share it with you now and give it as a reference.

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 PHP/HTML hybrid methods I have used

1. Single/double quotation mark enclosing method

This is the most basic method. The usage is as follows

 
   
     
   

   
     测试页面
   
 
 ';
?>

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

As for the difference between double quotes and single quotes, it isThe former parses variables within quotation marks, while the latter does not parse variables within quotation marks, see the example below

';
 echo '$Content';
 ?>

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, while it is still displayed when surrounded by single quotes. There are two disadvantages to writing the variable name

1. If the output content contains single/double quotes, it will be extremely difficult to process, because PHP cannot determine whether the quotation marks belong to the program or the output content, so it will report an error

2. Some modern text editors (such as SublimeText) written in this way will not be able to syntax color the output content surrounded by quotation marks. If Some formatting problems will be extremely difficult to detect. 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

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

';//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 <<<'LABEL'
 $Content
 LABEL;
 //其他无异
 
 ?>

3. Embed PHP program blocks in HTML (recommended)

4. Use front-end template engine

thinkPHP5.0 framework configuration format, loading, parsing and reading methods

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