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<?php $str = '<br /> <br /> <br /> <br />'; $str = preg_replace("%\s*<br />\s*%", "<br />", $str); echo $str;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Zaor2
function name:  (null)
number of ops:  9
compiled vars:  !0 = $str
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '%3Cbr+%2F%3E+%3Cbr+%2F%3E++%3Cbr+%2F%3E++++%3Cbr+%2F%3E'
    3     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%25%5Cs%2A%3Cbr+%2F%3E%5Cs%2A%25'
          3        SEND_VAL                                                 '%3Cbr+%2F%3E'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        ASSIGN                                                   !0, $2
    4     7        ECHO                                                     !0
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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