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<?php function test( string $str ) { echo $str; } $str = null; //test( $str ); $str = ""; test( $str );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/vO1ej
function name:  (null)
number of ops:  6
compiled vars:  !0 = $str
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    8     0  E >   ASSIGN                                                   !0, null
   11     1        ASSIGN                                                   !0, ''
   12     2        INIT_FCALL                                               'test'
          3        SEND_VAR                                                 !0
          4        DO_FCALL                                      0          
          5      > RETURN                                                   1

Function test:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/vO1ej
function name:  test
number of ops:  3
compiled vars:  !0 = $str
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
    5     1        ECHO                                                     !0
    6     2      > RETURN                                                   null

End of function test

Generated using Vulcan Logic Dumper, using php 8.0.0


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