php - Why does this causes an error? -


this question has answer here:

i have codeline....

define('csv_textsign', '');  $var = ( empty( trim( csv_textsign ) ) ? '"' : csv_textsign );

this causes error

fatal error: can't use function return value in write context in... line xx

but there valid functions...

bool empty ( mixed $var ) string trim ( string $str [, string $charlist ] )

i tried switch " ' in define , use vars instead of constants

am blind ? can explain me whats going wrong ?

from http://php.net/empty

prior php 5.5, empty() supports variables; else result in parse error. in other words, following not work: empty(trim($name)). instead, use trim($name) == false.


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