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<?php $str = '\u00c3\u0096sterreich'; $str = preg_replace_callback('/\\\\u([0-9a-fA-F]{4})/', function ($match) { return utf8_decode(mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE')); }, $str); print_r( $str);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/a6BG7
function name:  (null)
number of ops:  12
compiled vars:  !0 = $str
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, '%5Cu00c3%5Cu0096sterreich'
    5     1        INIT_FCALL                                                   'preg_replace_callback'
          2        SEND_VAL                                                     '%2F%5C%5Cu%28%5B0-9a-fA-F%5D%7B4%7D%29%2F'
          3        DECLARE_LAMBDA_FUNCTION                              ~2      [0]
    7     4        SEND_VAL                                                     ~2
          5        SEND_VAR                                                     !0
    5     6        DO_ICALL                                             $3      
          7        ASSIGN                                                       !0, $3
    9     8        INIT_FCALL                                                   'print_r'
          9        SEND_VAR                                                     !0
         10        DO_ICALL                                                     
         11      > 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/a6BG7
function name:  {closure:/in/a6BG7:5}
number of ops:  16
compiled vars:  !0 = $match
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    5     0  E >   RECV                                                 !0      
    6     1        INIT_FCALL                                                   'utf8_decode'
          2        INIT_FCALL                                                   'mb_convert_encoding'
          3        INIT_FCALL                                                   'pack'
          4        SEND_VAL                                                     'H%2A'
          5        FETCH_DIM_R                                          ~1      !0, 1
          6        SEND_VAL                                                     ~1
          7        DO_ICALL                                             $2      
          8        SEND_VAR                                                     $2
          9        SEND_VAL                                                     'UTF-8'
         10        SEND_VAL                                                     'UCS-2BE'
         11        DO_ICALL                                             $3      
         12        SEND_VAR                                                     $3
         13        DO_FCALL_BY_NAME                                             
         14      > RETURN                                                       $4
    7    15*     > RETURN                                                       null

End of Dynamic Function 0

Generated using Vulcan Logic Dumper, using php 8.5.0


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