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<?php $a=" ad asda "; var_dump(empty(trim($a)));
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/I4M6o
function name:  (null)
number of ops:  9
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, '+ad+asda+'
   3     1        INIT_FCALL                                               'var_dump'
         2        INIT_FCALL                                               'trim'
         3        SEND_VAR                                                 !0
         4        DO_ICALL                                         $2      
         5        BOOL_NOT                                         ~3      $2
         6        SEND_VAL                                                 ~3
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0