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<?php $a=array('0.txt','1.txt','2.txt','3.txt'); $n=(int)current(explode('.',end($a))); echo $n+=1; ?>
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/BNbe6
function name:  (null)
number of ops:  16
compiled vars:  !0 = $a, !1 = $n
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    3     1        INIT_FCALL                                               'current'
          2        INIT_FCALL                                               'explode'
          3        SEND_VAL                                                 '.'
          4        INIT_FCALL                                               'end'
          5        SEND_REF                                                 !0
          6        DO_ICALL                                         $3      
          7        SEND_VAR                                                 $3
          8        DO_ICALL                                         $4      
          9        SEND_VAR                                                 $4
         10        DO_ICALL                                         $5      
         11        CAST                                          4  ~6      $5
         12        ASSIGN                                                   !1, ~6
    4    13        ASSIGN_OP                                     1  ~8      !1, 1
         14        ECHO                                                     ~8
    5    15      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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