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<?php $arr = array_flip(['123', '456', '789']); var_dump(isset($arr[123]));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/E0UdH
function name:  (null)
number of ops:  9
compiled vars:  !0 = $arr
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'array_flip'
          1        SEND_VAL                                                 <array>
          2        DO_ICALL                                         $1      
          3        ASSIGN                                                   !0, $1
    5     4        INIT_FCALL                                               'var_dump'
          5        ISSET_ISEMPTY_DIM_OBJ                         0  ~3      !0, 123
          6        SEND_VAL                                                 ~3
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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