PHP：如何删除重复的数组项ONCE

Question

I have an array:

$arr1 = [1,2,2,3,3,3];

Is there any method by which I can delete a duplicate value once like,

some_function($arr1,3);

which gives me the ouput $arr1 = [1,2,2,3,3]

Answer 1

As per the comment, check if there are more than one of the element you're searching for, then find and remove one of them.

function remove_one_duplicate( $arr, $target ) {
    if( count( array_keys( $arr, $target ) ) > 1 ) {
        unset( $arr[array_search( $target, $arr )] );
    }

    return $arr;
}