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<?php $a = 'a-';echo var_dump(explode('-', $a)); ?>
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/cB3YO
function name:  (null)
number of ops:  10
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, 'a-'
         1        INIT_FCALL                                               'var_dump'
         2        INIT_FCALL                                               'explode'
         3        SEND_VAL                                                 '-'
         4        SEND_VAR                                                 !0
         5        DO_ICALL                                         $2      
         6        SEND_VAR                                                 $2
         7        DO_ICALL                                         $3      
         8        ECHO                                                     $3
         9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0