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<?php function isCorrect($string) { $len = strlen($string); $stack = []; for( $i = 0; $i < $len; ++$i) { if ($string[$i] == '(') array_push($stack, $string[i]); else if($string[$i] == ')') { if ( empty($stack) === false) array_pop($stack); else return false; } } return empty($stack); } $string = '((()))'; isCorrect($string); //var_dump(isCorrect($string)); //var_dump(strlen($string) % 2); //assert(isCorrect('') === true); //assert(isCorrect('()') === true); //assert(isCorrect('{()}') === true); //assert(isCorrect('{()}{}') === true); //assert(isCorrect('(())') === true); //assert(isCorrect('{({({({()})})})}') === true); //assert(isCorrect('{(})') === false);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/G96HY
function name:  (null)
number of ops:  5
compiled vars:  !0 = $string
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   17     0  E >   ASSIGN                                                   !0, '%28%28%28%29%29%29'
   18     1        INIT_FCALL                                               'iscorrect'
          2        SEND_VAR                                                 !0
          3        DO_FCALL                                      0          
   28     4      > RETURN                                                   1

Function iscorrect:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 28
Branch analysis from position: 28
2 jumps found. (Code = 44) Position 1 = 30, Position 2 = 6
Branch analysis from position: 30
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 6
2 jumps found. (Code = 43) Position 1 = 9, Position 2 = 16
Branch analysis from position: 9
1 jumps found. (Code = 42) Position 1 = 27
Branch analysis from position: 27
2 jumps found. (Code = 44) Position 1 = 30, Position 2 = 6
Branch analysis from position: 30
Branch analysis from position: 6
Branch analysis from position: 16
2 jumps found. (Code = 43) Position 1 = 19, Position 2 = 27
Branch analysis from position: 19
2 jumps found. (Code = 43) Position 1 = 22, Position 2 = 26
Branch analysis from position: 22
1 jumps found. (Code = 42) Position 1 = 27
Branch analysis from position: 27
Branch analysis from position: 26
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 27
filename:       /in/G96HY
function name:  isCorrect
number of ops:  33
compiled vars:  !0 = $string, !1 = $len, !2 = $stack, !3 = $i
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   RECV                                             !0      
    3     1        STRLEN                                           ~4      !0
          2        ASSIGN                                                   !1, ~4
    4     3        ASSIGN                                                   !2, <array>
    5     4        ASSIGN                                                   !3, 0
          5      > JMP                                                      ->28
    7     6    >   FETCH_DIM_R                                      ~8      !0, !3
          7        IS_EQUAL                                                 ~8, '%28'
          8      > JMPZ                                                     ~9, ->16
          9    >   INIT_FCALL                                               'array_push'
         10        SEND_REF                                                 !2
         11        FETCH_CONSTANT                                   ~10     'i'
         12        FETCH_DIM_R                                      ~11     !0, ~10
         13        SEND_VAL                                                 ~11
         14        DO_ICALL                                                 
         15      > JMP                                                      ->27
    8    16    >   FETCH_DIM_R                                      ~13     !0, !3
         17        IS_EQUAL                                                 ~13, '%29'
         18      > JMPZ                                                     ~14, ->27
   10    19    >   ISSET_ISEMPTY_CV                                 ~15     !2
         20        TYPE_CHECK                                    4          ~15
         21      > JMPZ                                                     ~16, ->26
         22    >   INIT_FCALL                                               'array_pop'
         23        SEND_REF                                                 !2
         24        DO_ICALL                                                 
         25      > JMP                                                      ->27
   11    26    > > RETURN                                                   <false>
    5    27    >   PRE_INC                                                  !3
         28    >   IS_SMALLER                                               !3, !1
         29      > JMPNZ                                                    ~19, ->6
   15    30    >   ISSET_ISEMPTY_CV                                 ~20     !2
         31      > RETURN                                                   ~20
   16    32*     > RETURN                                                   null

End of function iscorrect

Generated using Vulcan Logic Dumper, using php 8.0.0


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