替换数组中的重复单词（不删除）

Question

I have an array that have multiple set of words, some of them might be duplicated, and i want to replace the duplicated words from array with word: duplicate, and also keep one original. So if i have 5 duplicates, i want 4 of them to be replaced with duplicate and keep original one

$my_array = (0=>'test', 1=>'test2',2=>'test3',3=>'test');

As you see in my array, the array keys 0 and 3 has same value, i want to replace the last value with word 'duplicate'

$my_array = (0=>'test', 1=>'test2',2=>'test3',3=>'duplicate');

I tried different methods but without success:(

Answer 1

Try this, just remember what values you have visited.

$visited = array();
foreach($my_array as $key=>$val) {
    if(isset($visited[$val])) {
        $my_array[$key] = 'duplicate';
    } else {
        $visited[$val] = true;
    }
}