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<?php $iterations = 1000000; $string = 'btw'; // test isset perf $count = 0; while ($count < $iterations) { isset($string['key']); ++$count; }
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 7
Branch analysis from position: 7
2 jumps found. (Code = 44) Position 1 = 9, Position 2 = 4
Branch analysis from position: 9
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 4
2 jumps found. (Code = 44) Position 1 = 9, Position 2 = 4
Branch analysis from position: 9
Branch analysis from position: 4
filename:       /in/G8aDG
function name:  (null)
number of ops:  10
compiled vars:  !0 = $iterations, !1 = $string, !2 = $count
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 1000000
    3     1        ASSIGN                                                   !1, 'btw'
    6     2        ASSIGN                                                   !2, 0
    7     3      > JMP                                                      ->7
    8     4    >   ISSET_ISEMPTY_DIM_OBJ                         0  ~6      !1, 'key'
          5        FREE                                                     ~6
    9     6        PRE_INC                                                  !2
    7     7    >   IS_SMALLER                                               !2, !0
          8      > JMPNZ                                                    ~8, ->4
   10     9    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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