Fatal error Cannot redeclare function

Question

I have a function this is exactly how it appears  from the top of my file     lt  php   dirname getcwd     function generate salt          salt            for  i   0   i  lt  19   i                   salt    chr rand 35  126               return  salt          And for some reason  I keep getting the error      Fatal error  Cannot redeclare   generate salt    previously declared   in    Applications MAMP htdocs question-air includes functions php 5    in    Applications MAMP htdocs question-air includes functions php   on line 13   I cannot figure out why or how such an error could occur  Any ideas

User · Accepted Answer

This errors says your function is already defined ; which can mean :

you have the same function defined in two files
or you have the same function defined in two places in the same file
or the file in which your function is defined is included two times (so, it seems the function is defined two times)

To help with the third point, a solution would be to use include_once instead of include when including your functions.php file -- so it cannot be included more than once.

User · Answer

In my case it was because of function inside another function  once I moved out the function  error was gone   and everything worked as expected    This answer explains why you shouldn t use function inside function   This might help somebody

User · Answer

I want to add my 2 cent experience that might be helpful for many of you  If you declare a function inside a loop  for  foreach  while    you will face this error message

User · Answer

Solution 1  Don t declare function inside a loop  like foreach  for  while       Declare before them   Solution 2  You should include that file  wherein that function exists  only once  So   instead of     nbsp include       functions php    use        nbsp  nbsp   nbsp   nbsp   nbsp   nbsp   nbsp include once  functions php     Solution 3  If none of above helps  before function declaration  add a check to avoid re-declaration   if   function exists  your function name          function your function name

User · Answer

I had this pop up recently where a function was being called prior to its definition in the same file  and it didnt have the returned value assigned to a variable  Adding a var for the return value to be assigned to made the error go away

User · Answer

I had the same problem  And finally it was a double include  One include in a file named X  And another include in a file named Y  Knowing that in file Y I had include   X

User · Answer

means you have already created a class with same name   For Example   class ExampleReDeclare        some code here  class ExampleReDeclare      That second ExampleReDeclare throw the error

User · Answer

You re probably including the file functions php more than once

User · Answer

you can check first if name of your function isn t exists or not before you write function By     if   function exists  generate salt          function generate salt                                OR you can change name of function to another name

User · Answer

If your having a Wordpress theme problem it could be because although you have renamed the theme in your wp options table you havn t renamed the stylesheet  I struggled with this

User · Answer

This errors says your function is already defined ; which can mean :

you have the same function defined in two files
or you have the same function defined in two places in the same file
or the file in which your function is defined is included two times (so, it seems the function is defined two times)

To help with the third point, a solution would be to use include_once instead of include when including your functions.php file -- so it cannot be included more than once.

User · Answer

I had strange behavor when my   php bak  which automaticly was created by notepad  was included in compilation  After I removed all   php bak from folder this error was gone  Maybe this will be helpful for someone

User · Answer

or you can t create function in loop   such as   for  i 1   i lt 5   i      function foo     echo  something         foo      It will show error regarding redeclaration

User · Answer

Since the code you ve provided does not explicitly include anything  either it is being incldued twice  or  if the script is the entry point for the code  there must be a auto-prepend set up in the webserver config   php ini or alternatively you ve got a really obscure extension loaded which defines the function

User · Answer

I d recommend using get included files - as Pascal says you re either looking at the wrong file somehow or this function is already defined in a file that s been included   require once is also useful if the file you re attempting to include is essential

User · Answer

I don t like function exists  fun name   because it relies on the function name being turned into a string  plus  you have to name it twice  Could easily break with refactoring   Declare your function as a lambda expression  I haven t seen this solution mentioned     generate salt   function                  And use thusly    salt    generate salt      Then  at re-execution of said PHP code  the function simply overwrites the previous declaration

User · Answer

Another possible reason for getting that error is that your function has the same name as another PHP built-in function  For example   function checkdate  date       now strtotime date  Y-m-d H i s         tenYearsAgo strtotime  -10 years    now       dateToCheck strtotime  date      return   tenYearsAgo  gt   dateToCheck    false   true    echo checkdate  2016-05-12      where the checkdate function already exists in PHP

[php] "Fatal error: Cannot redeclare <function>"

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