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<?php // prelim $object = new stdClass; $object->field = 10; $param = new stdClass; $param->object = $object; // ternary variant $field = !($param && $param->object)?: $param->object->field; echo $field,"\n"; // alternative to ANDing $field = get_object_vars( $param->object )["field"] ?? null; echo $field,"\n";
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 46) Position 1 = 11, Position 2 = 13
Branch analysis from position: 11
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 13
filename:       /in/OZF61
function name:  (null)
number of ops:  32
compiled vars:  !0 = $object, !1 = $param, !2 = $field
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   NEW                                              $3      'stdClass'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $3
    4     3        ASSIGN_OBJ                                               !0, 'field'
          4        OP_DATA                                                  10
    5     5        NEW                                              $7      'stdClass'
          6        DO_FCALL                                      0          
          7        ASSIGN                                                   !1, $7
    6     8        ASSIGN_OBJ                                               !1, 'object'
          9        OP_DATA                                                  !0
    9    10      > JMPZ_EX                                          ~11     !1, ->13
         11    >   FETCH_OBJ_R                                      ~12     !1, 'object'
         12        BOOL                                             ~11     ~12
         13    >   BOOL_NOT                                         ~13     ~11
         14        JMP_SET                                          ~14     ~13, ->18
         15        FETCH_OBJ_R                                      ~15     !1, 'object'
         16        FETCH_OBJ_R                                      ~16     ~15, 'field'
         17        QM_ASSIGN                                        ~14     ~16
         18        ASSIGN                                                   !2, ~14
   10    19        ECHO                                                     !2
         20        ECHO                                                     '%0A'
   13    21        INIT_FCALL                                               'get_object_vars'
         22        FETCH_OBJ_R                                      ~18     !1, 'object'
         23        SEND_VAL                                                 ~18
         24        DO_ICALL                                         $19     
         25        FETCH_DIM_IS                                     ~20     $19, 'field'
         26        COALESCE                                         ~21     ~20
         27        QM_ASSIGN                                        ~21     null
         28        ASSIGN                                                   !2, ~21
   14    29        ECHO                                                     !2
         30        ECHO                                                     '%0A'
         31      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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