我应该使用array_diff_assoc还是===？

Question

I'm trying to compare two arrays to see if they are sorted or not. What is the difference between array_diff_assoc and comparing two arrays with the === operator? Are they the same thing?

For example

$arr_a
$arr_b

array_diff_assoc($arr_a, $arr_b)

Is the same as

$arr_a === $arr_b

?

Answer 1

Simple example tells us that these are different methods:

$a = ['t' => 2, 'p' => 3];
$b = ['p' => 3, 't' => 2];
var_dump($a === $b); // false, arrays are not identical                
var_dump(array_diff_assoc($a, $b));  
// array(0) {} - means that there's no difference between these arrays
// they have same keys with same values, but in different orders 
// and for `===` order is important