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<?php $array["\x00\x01\x02"] = 'foo'; var_dump($array); var_dump(bin2hex(key($array)));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/vGnRt
function name:  (null)
number of ops:  15
compiled vars:  !0 = $array
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN_DIM                                               !0, '%00%01%02'
          1        OP_DATA                                                  'foo'
    5     2        INIT_FCALL                                               'var_dump'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                                 
    6     5        INIT_FCALL                                               'var_dump'
          6        INIT_FCALL                                               'bin2hex'
          7        INIT_FCALL                                               'key'
          8        SEND_VAR                                                 !0
          9        DO_ICALL                                         $3      
         10        SEND_VAR                                                 $3
         11        DO_ICALL                                         $4      
         12        SEND_VAR                                                 $4
         13        DO_ICALL                                                 
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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