PHP cannot declare class because the name is already in use

Question

I have 5 scripts     database php parent php child1 php child2 php somescript php   parent php class looks like this   include  database php    class Parent       public  db      function   construct              this- gt db   new Database              The child1 php and child2 php classes looks like this   include  parent php    class Child1 extends Parent       function   construct             parent    construct               function useDb              this- gt db- gt some db operation              The problem  When I try to include both child1 and child2 in somescript php  it returns the following error      cannot declare class Database because the name is already in use in   database php on line 4  this is the line which contains words  class Database     But if I include only a single file  child1 or child2   it works great   How do I correct that

User · Answer

Class Parent cannot be declared because it is PHP reserved keyword so in effect it s already in use

User · Answer

try to use use include onceor require once instead of include or require

User · Answer

I had this problem before and to fix this  Just make sure     You did not create an instance of this class before If you call this from a class method  make sure the   destruct is set on the class you called from    My problem  before    I had class   Core  Router  Permissions and Render Core include s the Router class  Router then calls Permissions class  then Router   destruct calls the Render class and the error  Cannot declare class because the name is already in use  appeared   Solution   I added   destruct on Permission class and the   destruct was empty and it s fixed

User · Answer

You should use require once and include once  Inside parent php use  include once  database php     And inside child1 php and child2 php use  include once  parent php

User · Answer

Another option to include once or require once is to use class autoloading  http   php net manual en language oop5 autoload php

User · Answer

you want to use include once   or require once    The other option would be to create an additional file with all your class includes in the correct order so they don t need to call includes themselves    classes php   include  database php   include  parent php   include  child1 php   include  child2 php     Then you just need   require once  classes php

[php] PHP: cannot declare class because the name is already in use

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