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<?php xdebug_start_trace('/tmp/lookup-trace.log'); $ip = gethostbyname('smtp.gmail.com'); xdebug_stop_trace(); die($IP);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 79) Position 1 = -2
filename:       /in/HDbn2
function name:  (null)
number of ops:  11
compiled vars:  !0 = $ip, !1 = $IP
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL_BY_NAME                                       'xdebug_start_trace'
          1        SEND_VAL_EX                                              '%2Ftmp%2Flookup-trace.log'
          2        DO_FCALL                                      0          
    3     3        INIT_FCALL                                               'gethostbyname'
          4        SEND_VAL                                                 'smtp.gmail.com'
          5        DO_ICALL                                         $3      
          6        ASSIGN                                                   !0, $3
    4     7        INIT_FCALL_BY_NAME                                       'xdebug_stop_trace'
          8        DO_FCALL                                      0          
    5     9      > EXIT                                                     !1
         10*     > RETURN                                                   1

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