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<?php $string = ',1,2,,4,5,,,,6,,,,'; echo preg_replace('/,\K,+/', '', trim($string, ','));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/HhXJI
function name:  (null)
number of ops:  6
compiled vars:  !0 = $string
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, '%2C1%2C2%2C%2C4%2C5%2C%2C%2C%2C6%2C%2C%2C%2C'
    4     1        FRAMELESS_ICALL_2                trim                ~2      !0, '%2C'
          2        FRAMELESS_ICALL_3                preg_replace        ~3      '%2F%2C%5CK%2C%2B%2F', ''
          3        OP_DATA                                                      ~2
          4        ECHO                                                         ~3
          5      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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