Only variables should be passed by reference

Question

Other variables  MAX FILENAME LENGTH   260   file name     FILES  upload name   name      echo  testing-   file name   lt br gt       file name   strtolower  file name    file extension   end explode       file name      ERROR ON THIS LINE  uploadErrors   array      0  gt  There is no error  the file uploaded with success       1  gt  The uploaded file exceeds the upload max filesize allowed        2  gt  The uploaded file exceeds the MAX FILE SIZE directive that was specified in the HTML form       3  gt  The uploaded file was only partially uploaded       4  gt  No file was uploaded       6  gt  Missing a temporary folder       Any ideas  After 2 days still stuck

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PHP complains because end   expects a reference to something that it wants to change  which can be a variable only   You however pass the result of explode   directly to end   without saving it to a variable first  At the moment when explode   returns your value  it exists only in memory and no variable points to it  You cannot create a reference to something  or to something unknown in the memory   that does not exists   Or in other words  PHP does not know  if the value you give him is the direct value or just a pointer to the value  a pointer is also a variable  integer   which stores the offset of the memory  where the actual value resides   So PHP expects here a pointer  reference  always   But since this is still just a notice  not even deprecated  in PHP 7  you can savely ignore notices and use the ignore-operator instead of completely deactivating error reporting for notices    file extension    end explode       file name

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file extension   end explode       file name      ERROR ON THIS LINE      change this line as        file extension   end  explode       file name        no errors      Technique is simple please put one more brackets for explode        explode     then only it can perform independently

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Try this    parts   explode       file name    file extension   end  parts     The reason is that the argument for end is passed by reference  since end modifies the array by advancing its internal pointer to the final element  If you re not passing a variable in  there s nothing for a reference to point to   See end in the PHP manual for more info

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save the array from explode   to a variable  and then call end   on this variable    tmp   explode       file name    file extension   end  tmp     btw  I use this code to get the file extension    ext   substr  strrchr  file name        1     where strrchr extracts the string after the last   and substr cuts off the

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end     explode       file name    has worked since PHP 5 6  This is documented in the RFC although not in PHP docs themselves

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First  you will have to store the value in a variable like this   value   explode       string     Then you can use the end function to get the last index from an array like this  echo end  value     I hope it will work for you

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Since it raise a flag for over 10 years  but works just fine and return the expected value  a little stfu operator is the goodiest bad practice you are all looking for   file extension    end explode       file name     But warning  don t use in loops due to a performance hit  Newest version of php 7 3  offer the method array key last   and array key first    https   www php net manual en function array-key-last php

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Just as you can t index the array immediately  you can t call end on it either   Assign it to a variable first  then call end    basenameAndExtension   explode       file name    ext   end  basenameAndExtension

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Assign the result of explode to a variable and pass that variable to end    tmp   explode       file name    file extension   end  tmp     The problem is  that end requires a reference  because it modifies the internal representation of the array  i e  it makes the current element pointer point to the last element    The result of explode       file name  cannot be turned into a reference  This is a restriction in the PHP language  that probably exists for simplicity reasons

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Php 7 compatible proper usage    fileName         long file name jpg    tmp             explode       fileName    fileExtension   end  tmp    echo  fileExtension     jpg

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PHP offical Manual   end    Parameters  array   The array  This array is passed by reference because it is modified by the function  This means you must pass it a real variable and not a function returning an array because only actual variables may be passed by reference

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Everyone else has already given you the reason you re getting an error  but here s the best way to do what you want to do   file extension   pathinfo  file name  PATHINFO EXTENSION

[php] Only variables should be passed by reference

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