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<?php function foo(): ?array { return array(); } function bar(): ?array { return null; } foo(); bar();
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/YiD0p
function name:  (null)
number of ops:  7
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   NOP                                                      
   8     1        NOP                                                      
  13     2        INIT_FCALL                                               'foo'
         3        DO_FCALL                                      0          
  14     4        INIT_FCALL                                               'bar'
         5        DO_FCALL                                      0          
         6      > RETURN                                                   1

Function foo:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/YiD0p
function name:  foo
number of ops:  3
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   5     0  E > > RETURN                                                   <array>
   6     1*       VERIFY_RETURN_TYPE                                       
         2*     > RETURN                                                   null

End of function foo

Function bar:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/YiD0p
function name:  bar
number of ops:  3
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
  10     0  E > > RETURN                                                   null
  11     1*       VERIFY_RETURN_TYPE                                       
         2*     > RETURN                                                   null

End of function bar

Generated using Vulcan Logic Dumper, using php 7.3.0