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<?php function f(int $a) : string { return (string)$a; } var_dump(f(5));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/QZ1Zb
function name:  (null)
number of ops:  8
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   NOP                                                      
   7     1        INIT_FCALL                                               'var_dump'
         2        INIT_FCALL                                               'f'
         3        SEND_VAL                                                 5
         4        DO_FCALL                                      0  $0      
         5        SEND_VAR                                                 $0
         6        DO_ICALL                                                 
         7      > RETURN                                                   1

Function f:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/QZ1Zb
function name:  f
number of ops:  6
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   RECV                                             !0      
   4     1        CAST                                          6  ~1      !0
         2        VERIFY_RETURN_TYPE                                       ~1
         3      > RETURN                                                   ~1
   5     4*       VERIFY_RETURN_TYPE                                       
         5*     > RETURN                                                   null

End of function f

Generated using Vulcan Logic Dumper, using php 7.3.0