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<?php $htmls = [ "<p><div><p>aaaaaa</p></div></p>", "<div><p>aaaaaa</p></div>", "<p>aaaaaa</p><div>bbbbbb</div>", "<p>aaaaaa</p><div>bbbbbb</div><p>cccccc</p>", "<p>aaaaaa</p><p>bbbbbb</p>", "<p>hello<p>aaaaaa</p></p>", "<p><p>aaaaaa</p></p>" ]; foreach ($htmls as $i => $html) { $without_ptags = preg_replace('~<p>(?:(?R)|.*?)*</p>~', '', $html, 2, $count); if ($without_ptags === '' && $count == 1) { echo "$i => ", substr($html, 3, -4); }else{ echo "$i => not wrapped in p tags"; } echo "\n---\n"; }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 2, Position 2 = 29
Branch analysis from position: 2
2 jumps found. (Code = 78) Position 1 = 3, Position 2 = 29
Branch analysis from position: 3
2 jumps found. (Code = 46) Position 1 = 14, Position 2 = 16
Branch analysis from position: 14
2 jumps found. (Code = 43) Position 1 = 17, Position 2 = 24
Branch analysis from position: 17
1 jumps found. (Code = 42) Position 1 = 27
Branch analysis from position: 27
1 jumps found. (Code = 42) Position 1 = 2
Branch analysis from position: 2
Branch analysis from position: 24
1 jumps found. (Code = 42) Position 1 = 2
Branch analysis from position: 2
Branch analysis from position: 16
Branch analysis from position: 29
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 29
filename:       /in/fSZOh
function name:  (null)
number of ops:  31
compiled vars:  !0 = $htmls, !1 = $html, !2 = $i, !3 = $without_ptags, !4 = $count
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                       !0, <array>
   12     1      > FE_RESET_R                                           $6      !0, ->29
          2    > > FE_FETCH_R                                           ~7      $6, !1, ->29
          3    >   ASSIGN                                                       !2, ~7
   13     4        INIT_FCALL                                                   'preg_replace'
          5        SEND_VAL                                                     '%7E%3Cp%3E%28%3F%3A%28%3FR%29%7C.%2A%3F%29%2A%3C%2Fp%3E%7E'
          6        SEND_VAL                                                     ''
          7        SEND_VAR                                                     !1
          8        SEND_VAL                                                     2
          9        SEND_REF                                                     !4
         10        DO_ICALL                                             $9      
         11        ASSIGN                                                       !3, $9
   14    12        IS_IDENTICAL                                         ~11     !3, ''
         13      > JMPZ_EX                                              ~11     ~11, ->16
         14    >   IS_EQUAL                                             ~12     !4, 1
         15        BOOL                                                 ~11     ~12
         16    > > JMPZ                                                         ~11, ->24
   15    17    >   NOP                                                          
         18        FAST_CONCAT                                          ~13     !2, '+%3D%3E+'
         19        ECHO                                                         ~13
         20        FRAMELESS_ICALL_3                substr              ~14     !1, 3
         21        OP_DATA                                                      -4
         22        ECHO                                                         ~14
   14    23      > JMP                                                          ->27
   17    24    >   NOP                                                          
         25        FAST_CONCAT                                          ~15     !2, '+%3D%3E+not+wrapped+in+p+tags'
         26        ECHO                                                         ~15
   19    27    >   ECHO                                                         '%0A---%0A'
   12    28      > JMP                                                          ->2
         29    >   FE_FREE                                                      $6
   20    30      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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