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<?php $domain = 'a-valid-domain.com'; var_dump(filter_var($hostname, FILTER_VALIDATE_DOMAIN));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ZiE3O
function name:  (null)
number of ops:  9
compiled vars:  !0 = $domain, !1 = $hostname
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'a-valid-domain.com'
    5     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL                                               'filter_var'
          3        SEND_VAR                                                 !1
          4        SEND_VAL                                                 277
          5        DO_ICALL                                         $3      
          6        SEND_VAR                                                 $3
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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