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<?php var_dump( (int)null ); // casting null to int works fine function f(int $i) { } f('1'); // string is coerced fine f(null); // null is not coerced at all
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/RDKKK
function name:  (null)
number of ops:  11
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        CAST                                          4  ~0      null
          2        SEND_VAL                                                 ~0
          3        DO_ICALL                                                 
   10     4        INIT_FCALL                                               'f'
          5        SEND_VAL                                                 '1'
          6        DO_FCALL                                      0          
   11     7        INIT_FCALL                                               'f'
          8        SEND_VAL                                                 null
          9        DO_FCALL                                      0          
         10      > RETURN                                                   1

Function f:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/RDKKK
function name:  f
number of ops:  2
compiled vars:  !0 = $i
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    5     0  E >   RECV                                             !0      
    8     1      > RETURN                                                   null

End of function f

Generated using Vulcan Logic Dumper, using php 8.0.0


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