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<?php $a = "aabbbbabbaa"; print_r(preg_split("/a/", $a));
based on TbNtr
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/PCmHR
function name:  (null)
number of ops:  9
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, 'aabbbbabbaa'
   5     1        INIT_FCALL                                               'print_r'
         2        INIT_FCALL                                               'preg_split'
         3        SEND_VAL                                                 '%2Fa%2F'
         4        SEND_VAR                                                 !0
         5        DO_ICALL                                         $2      
         6        SEND_VAR                                                 $2
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0