php实现获取数组中相同/不相同的元素

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"green","g"=>"blue");
  
$result=array_intersect($a1,$a2);
print_r($result);
  
//
Array ( [a] => red [b] => green [c] => blue )

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("a"=>"red","b"=>"green","c"=>"blue");
  
$result=array_intersect_assoc($a1,$a2);
print_r($result);
?>
//
Array ( [a] => red [b] => green [c] => blue )

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"green","g"=>"blue");
  
$result=array_diff($a1,$a2);
print_r($result);
?>
//
Array ( [d] => yellow )

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("a"=>"red","b"=>"green","c"=>"blue");
  
$result=array_diff_assoc($a1,$a2);
print_r($result);
//
Array ( [d] => yellow )