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<?php $s='Ceam mai frecventa litera este , frecventa fiind de'; $a= explode('',$s); var_dump($a); var_dump(sort(array_unique($a)));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Wr7Uu
function name:  (null)
number of ops:  19
compiled vars:  !0 = $s, !1 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'Ceam+mai+frecventa+litera+este+%2C+frecventa+fiind+de'
    4     1        INIT_FCALL                                               'explode'
          2        SEND_VAL                                                 ''
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $3      
          5        ASSIGN                                                   !1, $3
    5     6        INIT_FCALL                                               'var_dump'
          7        SEND_VAR                                                 !1
          8        DO_ICALL                                                 
    6     9        INIT_FCALL                                               'var_dump'
         10        INIT_FCALL                                               'sort'
         11        INIT_FCALL                                               'array_unique'
         12        SEND_VAR                                                 !1
         13        DO_ICALL                                         $6      
         14        SEND_VAR_NO_REF                               0          $6
         15        DO_ICALL                                         $7      
         16        SEND_VAR                                                 $7
         17        DO_ICALL                                                 
         18      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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