PHP Fatal error Cannot redeclare class

Question

Does anyone know what can cause this problem      PHP Fatal error  Cannot redeclare class

User · Answer

This function will print a stack telling you where it was called from:

function PrintTrace() {
    $trace = debug_backtrace();
    echo '<pre>';
    $sb = array();
    foreach($trace as $item) {
        if(isset($item['file'])) {
            $sb[] = htmlspecialchars("$item[file]:$item[line]");
        } else {
            $sb[] = htmlspecialchars("$item[class]:$item[function]");
        }
    }
    echo implode("\n",$sb);
    echo '</pre>';
}

Call this function at the top of the file that includes your class.

Sometimes it will only print once, even though your class is being included two or more times. This is because PHP actually parses all the top-level classes in a file before executing any code and throws the fatal error immediately. To remedy this, wrap your class declaration in if(true) { ... }, which will move your class down a level in scope. Then you should get your two traces before PHP fatal errors.

This should help you find where you class is being included from multiple times in a complex project.

User · Answer

Just adding   This error can also occur if you by mistake put a function inside another function

User · Answer

Sometimes that happens due to some bugs in PHP s FastCGI   Try to restart it  At Ubuntu it s   service php-fastcgi restart

User · Answer

You must use require once   function

User · Answer

It actually means that class is already declared in the page and you are trying to recreate it   A simple technique is as follow   I solved the issue with the following  Hope this will help you a bit   if  class exists  testClassIfExist          require once  testClassIfExist php

User · Answer

Did You use Zend Framework  I have the same problem too  I solved it by commenting out this the following line in config application ini    includePaths library   APPLICATION PATH      library    I hope this will help you

User · Answer

Another possible culprit is source control and unresolved conflicts  SVN may cause the same class to appear twice in the conflicted code file  two alternative versions of it   mine  and  theirs

User · Answer

i have encountered that same problem  found out the case was the class name  i dealt with it by changing the name  hence resolving the problem

User · Answer

I have encountered that same problem  newer php version doesn t deal the same with multiple incluse of the same file  as a library   so now I have to change all my include by some include once   Or this tricks could help  if you d ont have too much class in your library     if  class exists  TestClass      true          your definition of TestClass

User · Answer

Use include once    - with this  your codes  will be included only one time

User · Answer

I had the same problem while using autoload like follows    lt  php  function   autoload  class name        include  class name     php         autoload  MyClass1      obj   new MyClass1       gt    and in other class there was    namespace testClassNamespace    class MyClass1        function    construct                 echo  MyClass1 constructor             The sollution is to keep namespace compatibility  in my example namespace testClassNamespace  in both files

User · Answer

Just do one thing whenever you include or require filename namely class login php  You can include it this way   include once class login php or  require once class login php   This way it never throws an error

User · Answer

That happens when you declare a class more than once in a page  You can fix it by either wrapping that class with an if statement  like below   or you can put it into a separate file and use require once    instead of include     if   class exists  TestClass            Put class TestClass here

User · Answer

This error might also occur if you define the   construct method more than once

User · Answer

This will happen if we use any of the in built classes in the php library  I used the class name as Directory and I got the same error  If you get error first make sure that the class name you use is not one of the in built classes

User · Answer

PHP 5 3  an I think older versions too  seems to have problem with same name in different cases  So I had this problem when a had the class Login and the interface it implements LogIn  After I renamed LogIn to Log In the problem got solved

User · Answer

You have a class of the same name declared more than once   Maybe via multiple includes   When including other files you need to use something like   include once  something php     to prevent multiple inclusions   It s very easy for this to happen  though not always obvious  since you could have a long chain of files being included by one another

User · Answer

It means you ve already created a class   For instance   class Foo        some code here  class Foo      That second Foo would throw the error

User · Answer

I had the same problem  quot PHP Fatal error  Cannot redeclare class XYZ php quot   I have two directories like controller and model and I uploaded by mistakenly XYZ php in both directories  so file with the same name cause the issue   First solution  Find in your whole project and make sure you have only one class XYZ php  Second solution  Add a namespace in your class so you can use the same class name

[php] PHP Fatal error: Cannot redeclare class

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