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<?php $var=''; print_r(isset($var)); var_dump($var); $var[0]='l'; var_dump($var);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/c1L6s
function name:  (null)
number of ops:  14
compiled vars:  !0 = $var
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, ''
    4     1        INIT_FCALL                                               'print_r'
          2        ISSET_ISEMPTY_CV                                 ~2      !0
          3        SEND_VAL                                                 ~2
          4        DO_ICALL                                                 
    5     5        INIT_FCALL                                               'var_dump'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                                 
    6     8        ASSIGN_DIM                                               !0, 0
          9        OP_DATA                                                  'l'
    7    10        INIT_FCALL                                               'var_dump'
         11        SEND_VAR                                                 !0
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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