함수 array unique()

PHP

PHP array_unique() 문서를 참고하십시오.

$arr = [ 1,4,5,4,4,3,2,1 ];
$arr2 = array_unique( $arr );
print_r( $arr2 );
# Array
# (
#     [0] => 1
#     [1] => 4
#     [2] => 5
#     [5] => 3
#     [6] => 2
# )

$arr = [ 'a'=>'hello', 'b'=>'world', 'c'=>'hello' ];
$arr2 = array_unique( $arr );
print_r( $arr2 );
# Array
# (
#     [a] => hello
#     [b] => world
# )