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<?php $a = (int) INF; $n = (int) pow(2,64); var_dump( $a/$n ); // floating point div with non-zero value echo $a - ($n * (int) ($a/$n) ),"\n"; // INF but s/b NAN echo fmod(INF,pow(2,64)),"\n"; // NAN correct! echo INF % pow(2,64); // integer div b/c % so pow(2,64) becomes 0
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/UfYZb
function name:  (null)
number of ops:  35
compiled vars:  !0 = $a, !1 = $n
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   CAST                                          4  ~2      INF
          1        ASSIGN                                                   !0, ~2
    3     2        INIT_FCALL                                               'pow'
          3        SEND_VAL                                                 2
          4        SEND_VAL                                                 64
          5        DO_ICALL                                         $4      
          6        CAST                                          4  ~5      $4
          7        ASSIGN                                                   !1, ~5
    5     8        INIT_FCALL                                               'var_dump'
          9        DIV                                              ~7      !0, !1
         10        SEND_VAL                                                 ~7
         11        DO_ICALL                                                 
    7    12        DIV                                              ~9      !0, !1
         13        CAST                                          4  ~10     ~9
         14        MUL                                              ~11     !1, ~10
         15        SUB                                              ~12     !0, ~11
         16        ECHO                                                     ~12
         17        ECHO                                                     '%0A'
   10    18        INIT_FCALL                                               'fmod'
         19        SEND_VAL                                                 INF
         20        INIT_FCALL                                               'pow'
         21        SEND_VAL                                                 2
         22        SEND_VAL                                                 64
         23        DO_ICALL                                         $13     
         24        SEND_VAR                                                 $13
         25        DO_ICALL                                         $14     
         26        ECHO                                                     $14
         27        ECHO                                                     '%0A'
   12    28        INIT_FCALL                                               'pow'
         29        SEND_VAL                                                 2
         30        SEND_VAL                                                 64
         31        DO_ICALL                                         $15     
         32        MOD                                              ~16     INF, $15
         33        ECHO                                                     ~16
         34      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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