Filter rows of a 2d array by the rows in another 2d array

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Two values from key => value pairs are considered equal only if (string) $elem1 === (string) $elem2 . In other words a strict check takes place so the string representations must be the same.

http://php.net/manual/en/function.array-diff-assoc.php

The (string) value of any array is "Array". Thus, your call to array_diff_assoc is effectively comparing these two things:

Array ( [0] => "Array" [1] => "Array" ) 
Array ( [0] => "Array" )

Since the thing that is different between those two is the [1] key/value pair from the first array, you get that back ([1] => Array( [11] => common set )).

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