Variable sharing in PHP files included

I have encountered some problems in the PHP self-learning process, and may encounter common mistakes. Please forgive me! Thank you! For example, we have the following test case. php {code ...} b. php {code ...} however, in ZendStudio, there will be a warning of Undefinedvariable & #039; $ msg & #039;, although it does not affect... self-study PHPSome problems may cause common mistakes during the process. Please forgive me! Thank you!
The following test cases are available:
a.php

b.php

However, in Zend StudioUndefined variable '$msg'Warning, although it does not affect the running results, but it may affect the later maintenance or reading by others, so I would like to ask if there is any good way to solve this problem of "obsessive-compulsive disorder? Can Zend Studio not report this warning?

ViewtypechoThe following statement is displayed in the source code process:
/usr/themes/default/404.php

  
  Need ('header. php');?>
 
404-  
 
                    
    

      
  Need ('footer. php');?>

ThattypechoHow to implement and use$thisAccessneed?
I noticedtypechoThe topic templates of are all used.$thisTo use the provided plug-ins or functions. What is the principle?

Reply content:

Self-studyPHPSome problems may cause common mistakes during the process. Please forgive me! Thank you!
The following test cases are available:
a.php

b.php

However, in Zend StudioUndefined variable '$msg'Warning, although it does not affect the running results, but it may affect the later maintenance or reading by others, so I would like to ask if there is any good way to solve this problem of "obsessive-compulsive disorder? Can Zend Studio not report this warning?

ViewtypechoThe following statement is displayed in the source code process:
/usr/themes/default/404.php

  
  Need ('header. php');?>
 
404-  
 
                    
    

      
  Need ('footer. php');?>

ThattypechoHow to implement and use$thisAccessneed?
I noticedtypechoThe topic templates of are all used.$thisTo use the provided plug-ins or functions. What is the principle?

1. Do not use bare global variables to wrap them into a class.

2. A template is included by the method of an object and has the following scopes:$thisThis variable.