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<?php class Out extends Exception { private $value; function __construct($value) { $this->value = $value; } function getValue() { return $this->value; } } function out($value = NULL) { throw new Out($value); } function mul($x, $y) { try { return ($x ?? out('x is NULL')) * ($y ?? out('y is NULL')); } catch (Out $out) { return $out->getValue(); } } var_export(mul(3, 4)); print "\n"; var_export(mul(3, NULL)); print "\n"; var_export(mul(NULL, 4)); print "\n";
based on TjuuO
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/U6arm
function name:  (null)
number of ops:  25
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
  26     0  E >   INIT_FCALL                                               'var_export'
         1        INIT_FCALL                                               'mul'
         2        SEND_VAL                                                 3
         3        SEND_VAL                                                 4
         4        DO_FCALL                                      0  $0      
         5        SEND_VAR                                                 $0
         6        DO_ICALL                                                 
  27     7        ASSIGN_OBJ                                               '%0A'
  28     8        INIT_FCALL                                               'var_export'
         9        INIT_FCALL                                               'mul'
        10        SEND_VAL                                                 3
        11        SEND_VAL                                                 null
        12        DO_FCALL                                      0  $2      
        13        SEND_VAR                                                 $2
        14        DO_ICALL                                                 
  29    15        ASSIGN_OBJ                                               '%0A'
  30    16        INIT_FCALL                                               'var_export'
        17        INIT_FCALL                                               'mul'
        18        SEND_VAL                                                 null
        19        SEND_VAL                                                 4
        20        DO_FCALL                                      0  $4      
        21        SEND_VAR                                                 $4
        22        DO_ICALL                                                 
  31    23        ASSIGN_OBJ                                               '%0A'
        24      > RETURN                                                   1

Function out:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 108) Position 1 = -2
filename:       /in/U6arm
function name:  out
number of ops:  6
compiled vars:  !0 = $value
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
  13     0  E >   RECV_INIT                                        !0      null
  14     1        NEW                                              $1      :6
         2        SEND_VAR_EX                                              !0
         3        DO_FCALL                                      0          
         4      > THROW                                         0          $1
  15     5*     > RETURN                                                   null

End of function out

Function mul:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
Found catch point at position: 15
Branch analysis from position: 15
2 jumps found. (Code = 107) Position 1 = 16, Position 2 = -2
Branch analysis from position: 16
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/U6arm
function name:  mul
number of ops:  20
compiled vars:  !0 = $x, !1 = $y, !2 = $out
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
  17     0  E >   RECV                                             !0      
         1        RECV                                             !1      
  19     2        COALESCE                                         ~3      !0
         3        INIT_FCALL                                               'out'
         4        SEND_VAL                                                 'x+is+NULL'
         5        DO_FCALL                                      0  $4      
         6        ASSIGN_BW_OR                                  0  ~3      $4
         7        COALESCE                                         ~5      !1
         8        INIT_FCALL                                               'out'
         9        SEND_VAL                                                 'y+is+NULL'
        10        DO_FCALL                                      0  $6      
        11        ASSIGN_BW_OR                                  0  ~5      $6
        12        MUL                                              ~7      ~3, ~5
        13      > RETURN                                                   ~7
        14*       JMP                                                      ->19
  21    15  E > > CATCH                                       last         'Out'
  22    16    >   INIT_METHOD_CALL                                         !2, 'getValue'
        17        DO_FCALL                                      0  $8      
        18      > RETURN                                                   $8
  24    19*     > RETURN                                                   null

End of function mul

Class Out:
Function __construct:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/U6arm
function name:  __construct
number of ops:  4
compiled vars:  !0 = $value
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   5     0  E >   RECV                                             !0      
   6     1        ASSIGN_SUB                                    0          'value'
         2        OP_DATA                                                  !0
   7     3      > RETURN                                                   null

End of function __construct

Function getvalue:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/U6arm
function name:  getValue
number of ops:  3
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   9     0  E >   FETCH_OBJ_R                                      ~0      'value'
         1      > RETURN                                                   ~0
  10     2*     > RETURN                                                   null

End of function getvalue

End of class Out.

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