php array_diff_assoc（）给出了错误的区别

Question

i have two arrays, and i use array_diff_assoc() php function for get the difference, but it always returns the comm set as the difference, but it should be new q sets whats the wrong with this, please help

arrays--

Array ( [0] => Array ( [12] => new q sets ) [1] => Array ( [11] => common set ) ) 

Array ( [0] => Array ( [11] => common set ) ) 

after use array_diff_assoc() o p

Array ( [1] => Array ( [11] => common set ) ) 

Answer 1

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 )).