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<?php $a = ( $post->post_type ?? 'not-attachment' ) === 'attachement' ; var_dump( $a );
based on LdBVV
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Babft
function name:  (null)
number of ops:  9
compiled vars:  !0 = $a, !1 = $post
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   FETCH_OBJ_IS                                     ~2      !1, 'post_type'
         1        COALESCE                                         ~3      ~2
         2        ASSIGN_BW_OR                                  0  ~3      'not-attachment'
         3        IS_NOT_IDENTICAL                                 ~4      ~3, 'attachement'
         4        QM_ASSIGN                                                !0
   4     5        INIT_FCALL                                               'var_dump'
         6        SEND_VAR                                                 !0
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0