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<?php $latest_filename = "1444301049_10.PNG"; if((int) substr($latest_filename, -6, -4) >= 10) { $file = (int) substr($latest_filename, -6) + 1; var_dump($file); $string = $path . $name . "_" . (string)$file . ".PNG"; // var_dump($string); }
based on CT8oX
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = 9, Position 2 = 25
Branch analysis from position: 9
Jump found. Position 1 = -2
Branch analysis from position: 25
filename:       /in/a0lAT
function name:  (null)
number of ops:  26
compiled vars:  !0 = $latest_filename, !1 = $file, !2 = $string, !3 = $path, !4 = $name
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   ASSIGN                                                   !0, '1444301049_10.PNG'
   3     1        INIT_FCALL                                               'substr'
         2        SEND_VAR                                                 !0
         3        SEND_VAL                                                 -6
         4        SEND_VAL                                                 -4
         5        DO_ICALL                                         $6      
         6        CAST                                          4  ~7      $6
         7        IS_SMALLER_OR_EQUAL                              ~8      10, ~7
         8      > JMPZ                                                     ~8, ->25
   5     9    >   INIT_FCALL                                               'substr'
        10        SEND_VAR                                                 !0
        11        SEND_VAL                                                 -6
        12        DO_ICALL                                         $9      
        13        CAST                                          4  ~10     $9
        14        ADD                                              ~11     ~10, 1
        15        ASSIGN                                                   !1, ~11
   6    16        INIT_FCALL                                               'var_dump'
        17        SEND_VAR                                                 !1
        18        DO_ICALL                                                 
   7    19        CONCAT                                           ~14     !3, !4
        20        CONCAT                                           ~15     ~14, '_'
        21        CAST                                          6  ~16     !1
        22        CONCAT                                           ~17     ~15, ~16
        23        CONCAT                                           ~18     ~17, '.PNG'
        24        ASSIGN                                                   !2, ~18
        25    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0