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<?php $emptyXml = simplexml_load_string('<root />'); $xml = simplexml_load_string('<root>foo</root>'); var_dump(!$emptyXml, empty($emptyXml)); var_dump(!$xml, empty($xml));
based on fZ7lc
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/74Tc4
function name:  (null)
number of ops:  21
compiled vars:  !0 = $emptyXml, !1 = $xml
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'simplexml_load_string'
         1        SEND_VAL                                                 '%3Croot+%2F%3E'
         2        DO_ICALL                                         $2      
         3        ASSIGN                                                   !0, $2
   4     4        INIT_FCALL                                               'simplexml_load_string'
         5        SEND_VAL                                                 '%3Croot%3Efoo%3C%2Froot%3E'
         6        DO_ICALL                                         $4      
         7        ASSIGN                                                   !1, $4
   6     8        INIT_FCALL                                               'var_dump'
         9        BOOL_NOT                                         ~6      !0
        10        SEND_VAL                                                 ~6
        11        ISSET_ISEMPTY_VAR                           293601280  ~7      !0
        12        SEND_VAL                                                 ~7
        13        DO_ICALL                                                 
   7    14        INIT_FCALL                                               'var_dump'
        15        BOOL_NOT                                         ~9      !1
        16        SEND_VAL                                                 ~9
        17        ISSET_ISEMPTY_VAR                           293601280  ~10     !1
        18        SEND_VAL                                                 ~10
        19        DO_ICALL                                                 
        20      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.1.0