Strict Standards Only variables should be passed by reference error

Question

I am trying to get an HTML-based recursive directory listing based on code here   http   webdevel blogspot in 2008 06 recursive-directory-listing-php html   Code runs fine but it throws some errors      Strict Standards  Only variables should be passed by reference in   C  xampp htdocs directory5 php on line 34      Strict Standards  Only variables should be passed by reference in   C  xampp htdocs directory5 php on line 32      Strict Standards  Only variables should be passed by reference in   C  xampp htdocs directory5 php on line 34   Below is the excerpt of code   else           the extension is after the last         extension   strtolower array pop explode       value         Line 32        the file name is before the last         fileName   array shift explode       value       Line 34        continue to next item if not one of the desired file types    if  in array       fileTypes   amp  amp   in array  extension   fileTypes   continue         add the list item     results       lt li class   file  extension   gt  lt a href     str replace                 directory     value   gt    displayName  fileName   extension    lt  a gt  lt  li gt  n

User · Answer

array shift the only parameter is an array passed by reference  The return value of explode       value  does not have any reference  Hence the error   You should store the return value to a variable first          arr   explode       value        extension   strtolower array pop  arr            fileName   array shift  arr       From PHP net     The following things can be passed by reference    - Variables  i e  foo  a  - New statements  i e  foo new foobar    -  References returned from functions  2       No other expressions should be passed by reference  as the result is undefined  For example  the following examples of passing by reference are invalid

User · Answer

This should be OK      value   explode       value       extension   strtolower array pop  value        Line 32       the file name is before the last         fileName   array shift  value      Line 34

User · Answer

Instead of parsing it manually it s better to use pathinfo function    path parts   pathinfo  value    extension   strtolower  path parts  extension      fileName    path parts  filename

User · Answer

I had a similar problem   I think the problem is that when you try to enclose two or more functions that deals with an array type of variable  php will return an error   Let s say for example this one    data   array  key1    gt   Robert    key2    gt   Pedro    key3    gt   Jose        This function returns the last key of an array  in this case it s  data   lastKey   array pop array keys  data        Output is  key3  which is the last array     But php will return    Strict Standards  Only variables should     be passed by reference    error     So  In order to solve this one    is that you try to cut     down the process one by one like this    data1    array keys  data    lastkey   array pop  data1    echo  lastkey    There you go

[php] "Strict Standards: Only variables should be passed by reference" error

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