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<?php if (!isset($array['key'])) { $array['key'] = 1; }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 3, Position 2 = 5
Branch analysis from position: 3
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 5
filename:       /in/2W7W1
function name:  (null)
number of ops:  6
compiled vars:  !0 = $array
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ISSET_ISEMPTY_DIM_OBJ                         0  ~1      !0, 'key'
         1        BOOL_XOR                                         ~2      ~1
         2      > JMPZ                                                     ~2, ->5
   3     3    >   ASSIGN_DIM                                               !0, 'key'
         4        OP_DATA                                                  1
   4     5    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0