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<?php $a = [1,2,3,4,5]; if (!isset(array_keys($a)[0])) echo "x"; echo "y";
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 7, Position 2 = 8
Branch analysis from position: 7
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 8
filename:       /in/G4uKW
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, <array>
    5     1        INIT_FCALL                                               'array_keys'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                         $2      
          4        ISSET_ISEMPTY_DIM_OBJ                         0  ~3      $2, 0
          5        BOOL_NOT                                         ~4      ~3
          6      > JMPZ                                                     ~4, ->8
          7    >   ECHO                                                     'x'
          8    >   ECHO                                                     'y'
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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