PHP implementation to get the same/different elements in the array

1. Get the same elements of the array

array_intersect() This function compares the key values ​​​​of two (or more) arrays, and Returns an intersection array containing all keys in the compared array (array1) and any other parameter arrays (array2 or array3, etc.).

<?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 )

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array_intersect_assoc() function is used to compare the key names and keys of two (or more) arrays value, and returns the intersection. Different from the array_intersect() function, this function not only compares key values, but also compares key names. The keys of the elements in the returned array remain unchanged.

<?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 )

2. Get different elements in the array

array_diff() function returns the difference array of two arrays. This array contains all keys that are in the array being compared, but are not in any of the other parameter arrays. In the returned array, the key names remain unchanged.

<?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 )

array_diff_assoc() function is used to compare the key names and key values ​​of two (or more) arrays and return the difference.

<?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 )

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