PHP how to join to records from array

Hi it is any way to connect to records where value is the same?

like

[12]=> Array (
  [ID] => 127078
  [row1] => 
  [post] => N16 7UJ
 )
 
 [13]=> Array (
  [ID] => 127078
  [row1] => something
  [post] =>
 )
 

and make like that

[12]=> Array (
  [ID] => 127078
  [row1] => something
  [post] => N16 7UJ
 )
 

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