How to use a PHP class from another file

Question

Let s say I ve got two files class php and page php class php  lt  php      class IUarts           function   construct                  this- gt data   get data  mydata                      gt   That s a very rudamentary example  but let s say  I want to use   vars   new IUarts     print  vars- gt data    in my page php file  how do I go about doing that  If I do include LIB   class php    it yells at me and gives me Fatal error  Cannot redeclare class IUarts in  dir class php on line 4

User · Accepted Answer

You can use include include once or require require once  require once  class php        Alternatively  use autoloading by adding to page php   lt  php  function my autoloader  class        include  classes      class     class php      spl autoload register  my autoloader      vars   new IUarts     print  vars- gt data         gt    It also works adding that   autoload function in a lib that you include on every file like utils php   There is also this post that has a nice and different approach   Efficient PHP auto-loading and naming strategies

User · Answer

Use include once instead  This error means that you have already included this file   include once LIB   class php

User · Answer

In this case  it appears that you ve already included the file somewhere  But for class files  you should really  include  them using require once to avoid that sort of thing  it won t include the file if it already has been   And you should usually use require  once   not include  once   the difference being that require will cause a fatal error if the file doesn t exist  instead of just issuing a warning

User · Answer

use   require once   DIR      path  of  filename php      This will also help in importing files in from different folders  Try extends method to inherit the classes in that file and reuse the functions

User · Answer

Use include  class classname php     And class should use  lt  php   code    gt  not  lt     code    gt

[php] How to use a PHP class from another file?

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