How to Check If Two Arrays are Similar in PHP?

<?php
/**
 * Determine if two associative arrays are similar
 *
 * Both arrays must have the same indexes with identical values
 * without respect to key ordering 
 * 
 * @param array $a
 * @param array $b
 * @return bool
 */
if (!function_exists("arrays_are_similar")) {
  function arrays_are_similar($a, $b) {
    if (!is_array($a) || (!is_array($b))) return false;
    sort($a);
    sort($b);
    $aa1 = implode(',', array_keys($a));
    $bb1 = implode(',', array_keys($b));
    $aa2 = implode(',', array_values($a));
    $bb2 = implode(',', array_values($b));    
    return ($aa1 === $bb1) && ($aa2 === $bb2);
  }
}

<?php
use PHPUnit\Framework\TestCase;
 
require_once('/var/www/functions/arrays_are_similar.php');
 
class ArraySimilarTests extends TestCase { 
 
  public function dataProvider() {
    return [
        [array(1, 2, 3), array(3, 2, 1), true],
        [array(1, 2, 3, 2), array(3, 2, 1), false],
        [array(2, 3, 2), array(3, 2, 1, 2), false],
        [array(1, 2, 3, 2), array(2, 3, 2, 1), true],
        [array(1, "2", 3), array(3, "2", 1), true],
        [array(1, 2, 3, 4), array(3, 2, 1), false],
        [array(1 => 2, 2 => 3), array(1 => 2, 2 => 3), true],        
        [array(1 => 2, 2 => 3), array(2 => 3, 1 => 2), true],
        [array(1 => 2, 2 => "3"), array(2 => 3, 1 => 2), true],
        [array(1 => 2, 2 => 3), array(2 => 4, 1 => 2), false],
        [null, array(2 => 3, 1 => 2), false],
        [null, null, false]
    ];
  }
  
  /**
   * @dataProvider dataProvider
   */    
  public function testArraySimilar($arr1, $arr2, $result) {
    $this->assertEquals($result, arrays_are_similar($arr1, $arr2));
  }        
}