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<?php $html = '<ul class="foo"> <li>Item 1</li> <li>Item 2</li> <li>Item 3</li> </ul> <ul> <li>Item 1</li> <li>Item 2</li> <li>Item 3</li> </ul> <ul class="foo"> <li>Item 1</li> <li>Item 2</li> <li>Item 3</li> </ul>'; $newHtml = preg_replace_callback("/(?<=<ul\sclass=\"foo\">).*?(?=<\/ul>)/s", function($ma){ return preg_replace("/(?<=<li>)(.*)(?=<\/li>)/", '<svg class="icon"><use xlink:href="#foo"></use></svg>$1', $ma[0]); }, $html); echo $newHtml;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/IOokf
function name:  (null)
number of ops:  10
compiled vars:  !0 = $html, !1 = $newHtml
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '%3Cul+class%3D%22foo%22%3E%0A++%3Cli%3EItem+1%3C%2Fli%3E%0A++%3Cli%3EItem+2%3C%2Fli%3E%0A++%3Cli%3EItem+3%3C%2Fli%3E%0A%3C%2Ful%3E%0A%3Cul%3E%0A++%3Cli%3EItem+1%3C%2Fli%3E%0A++%3Cli%3EItem+2%3C%2Fli%3E%0A++%3Cli%3EItem+3%3C%2Fli%3E%0A%3C%2Ful%3E++++%0A%3Cul+class%3D%22foo%22%3E%0A++%3Cli%3EItem+1%3C%2Fli%3E%0A++%3Cli%3EItem+2%3C%2Fli%3E%0A++%3Cli%3EItem+3%3C%2Fli%3E%0A%3C%2Ful%3E'
   19     1        INIT_FCALL                                               'preg_replace_callback'
          2        SEND_VAL                                                 '%2F%28%3F%3C%3D%3Cul%5Csclass%3D%22foo%22%3E%29.%2A%3F%28%3F%3D%3C%5C%2Ful%3E%29%2Fs'
          3        DECLARE_LAMBDA_FUNCTION                          ~3      [0]
   21     4        SEND_VAL                                                 ~3
          5        SEND_VAR                                                 !0
   19     6        DO_ICALL                                         $4      
          7        ASSIGN                                                   !1, $4
   23     8        ECHO                                                     !1
   24     9      > RETURN                                                   1


Dynamic Functions:
Dynamic Function 0
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/IOokf
function name:  {closure}
number of ops:  9
compiled vars:  !0 = $ma
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   19     0  E >   RECV                                             !0      
   20     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%2F%28%3F%3C%3D%3Cli%3E%29%28.%2A%29%28%3F%3D%3C%5C%2Fli%3E%29%2F'
          3        SEND_VAL                                                 '%3Csvg+class%3D%22icon%22%3E%3Cuse+xlink%3Ahref%3D%22%23foo%22%3E%3C%2Fuse%3E%3C%2Fsvg%3E%241'
          4        FETCH_DIM_R                                      ~1      !0, 0
          5        SEND_VAL                                                 ~1
          6        DO_ICALL                                         $2      
          7      > RETURN                                                   $2
   21     8*     > RETURN                                                   null

End of Dynamic Function 0

Generated using Vulcan Logic Dumper, using php 8.0.0


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