Form submission PHP form submission form name containing a period () will be converted into an underscore (_)

Recently, when I was working on a company project, I discovered a strange problem. When I submitted a normal form, I found that the submitted value could not be obtained normally. This discovery made me confused at first. At first, I thought it was me. There was a problem with the service and it could not be written to the database normally. Later, after detecting the SQL statement, it was found that the problem actually occurred in obtaining the data. The obtained data was all empty. Later, after debugging, it was discovered that all the variables submitted to the backend were , are no longer the expected variables, but have been converted by PHP.
The test code is provided as follows:

Copy the code The code is as follows:

< ;body>

Name:

Password:

QQ:

Address:

Phone:

Gender: MaleFemale





if ($_POST) {
echo '

'; 
var_export( $_POST); 
} 
?> 


Code Example 1 
The result after running is as follows: 
Figure 1 
As you can see, all the . numbers I included in the control were converted into _Underscore, in order to test some other symbols, I did the above test. So far, I only found that the dot (.) will be converted into an underscore (_), so I took it for granted that I used info.name to access it in the backend. , it cannot be found because it has actually been converted into info_name. 
So when you use forms in the future, try not to use . in naming.
                
                
                

                    The above has introduced form submission. If the PHP form submission form name contains a period (), it will be converted into an underscore (_), including the content of form submission. I hope it will be helpful to friends who are interested in PHP tutorials.