changing duplicate array elements

[wildmurphy]

$arr[0] = "p"
$arr[1] = "ps"
$arr[2] = "pw"
$arr[3] = "p"

is there a way of using array_unique to change the $arr[3] into p_1 or something along those lines???

Thanks, Jay.

[Rohan_Hill]

No, array_unique just deletes duplicate values.

[coditoergosum]

You could create a function that does it all with a few loops, something like this:

<? 

$arr[0] = "p";
$arr[1] = "ps";
$arr[2] = "pw";
$arr[3] = "p";

for ($i = 0; isset($arr[$i]); $i++) {
$c = 0;
for($c = 0; $i > $c; $c++) {
if ($arr[$i] == $arr[$c]) {
$arr[$i] = $arr[$i] . "_1";
}
}
}

echo("$arr[0]<br>$arr[1]<br>$arr[2]<br>$arr[3]<br>");
?>

Hope this helps.

[wildmurphy]

Thats super cool thanks dude, managed to figure it out eventually for myself, Extremely similiar to what you have there, gave myself a new problem though, when there are three or four #++ of the same in one array you get _1_1_1 on the end of them lol.

Got that covere though 🙂

Cheers!

[Wien]

I did something really cool with a small complexity O(2n) compared to your two loops O(n*n), so really quicker ! ! which is very important if you handle big big arrays

but i change a little bit what you need, let's say there is 3 occurences of "a" then in the result you'll have
a_1
a_2
a_3
and if there is 1 occurence of b
b_1
I don't think it's embarrassing for your needs

The script :

$arr[0] = "a";
$arr[1] = "b";
$arr[2] = "c";
$arr[3] = "a";
$arr[4] = "a";
$arr[5] = "b";
$arr[6] = "a";
$arr[7] = "d";
$arr[8] = "a";
$arr[9] = "b";
$arr[10] = "e";

for ($i = 0,$n = count($arr); $i < $n; $i++) {
    $uTab[$arr[$i]] += 1;
    $arr2[$i] = $arr[$i] . "_" . $uTab[$arr[$i]];
}

for ($i = 0,$n = count($arr2); $i < $n; $i++) {
    echo "<br>" . $arr2[$i];
}

The result is

a_1
b_1
c_1
a_2
a_3
b_2
a_4
d_1
a_5
b_3
e_1