Question

I have this array

Array 
( 
    [0] => posts Object 
        ( 
            [title] => test1 
            [dbh] => DataBase Object 
                  ( 
                      [dbh] => PDO Object ( ) 
                  ) 
        )

    [1] => posts Object 
        ( 
            [title] => test1 
            [dbh] => DataBase Object 
                  (
                      [dbh] => PDO Object ( ) 
                  ) 
        )

    [2] => posts Object 
        ( 
            [title] => test2 
            [dbh] => DataBase Object 
                  (
                      [dbh] => PDO Object ( ) 
                  ) 
        )
)

I can’t use array_unique(), because the the object can’t to be converted to string

Answer 1

The best way would be to not use foreach. You should use for:

for ($i = 0; $i < count($array); $i++) {
  for ($j = $i + 1; $j < count($array); $j++) {
    if ($array[$i] === $array[$j]) {
      unset($array[$j]);
      $array = array_values($array);
    }
  }
}

Foreach makes a copy of your array and loops over the copy, which makes it a bit more complicated to keep track of which duplicates is already tested/removed.

The code above will check if your post Objects are of the same instance, and remove if they are. You might want to check if they contain the same data, but are not of the same instance. Then you will have to expand the if line a little bit:

if ($array[$i]->title === $array[$j]->title && $array[$i]->dbh === $array[$j]->dbh) {

…for checking if title is the same and the DataBase objects are of the same instance.