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<?php var_dump([extension_loaded('iconv'), phpversion('iconv')]);
based on LMRP8
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/BknSZ
function name:  (null)
number of ops:  12
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   INIT_FCALL                                               'var_dump'
         1        INIT_FCALL                                               'extension_loaded'
         2        SEND_VAL                                                 'iconv'
         3        DO_ICALL                                         $0      
         4        INIT_ARRAY                                       ~1      $0
         5        INIT_FCALL                                               'phpversion'
         6        SEND_VAL                                                 'iconv'
         7        DO_ICALL                                         $2      
         8        ADD_ARRAY_ELEMENT                                ~1      $2
         9        SEND_VAL                                                 ~1
        10        DO_ICALL                                                 
        11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0