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<?php
 
if (
  preg_match_all(
    '~(?(DEFINE)(?<content>\w+))(?><(?&content)>|\[(?&content)\]|\((?&content)\))~',
    '<123> [234] (45) 6 (<78>)',
    $m
  )
)
print_r($m);
 
?>

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• # 1:   hide show   clone   input   231 days 10 hours ago    Success

  result: Success     time: 0.02s    memory: 13064 kB     returned value: 0

  input: no
  output:

  Array
  (
      [0] => Array
          (
              [0] => <123>
              [1] => [234]
              [2] => (45)
              [3] => <78>
          )
  
      [content] => Array
          (
              [0] => 
              [1] => 
              [2] => 
              [3] => 
          )
  
      [1] => Array
          (
              [0] => 
              [1] => 
              [2] => 
              [3] => 
          )
  
  )