使用FOR循环比较和增加字符串值

Question

I'm trying to compare new string against old string from database, and if that string exists increase it by one, for example if string car exists new string should be car-1 and if that string exist then car-2...

I'm using Laravel, and have achieved that by using while() loop, but I would like to do it with for() loop too.

This is my code that works:

foreach($lang_codes as $key => $value)
{               
    $oldAlias = str_slug($request->{"new_category_lang_{$value->code}"}, '-');
    $newAlias = $oldAlias;
    $aliasCheck = ShopCategoryName::where('alias', $oldAlias)->first();
    $newCategory = new ShopCategoryName;

    $i = 1;
    while ($aliasCheck) 
    {
        $newAlias = $oldAlias . '-' . $i;
        $aliasCheck = ShopCategoryName::where('alias', $newAlias)->first();
        $i++;
    }
}

I was trying to use strcmp() with for() loop, but I don't know how to put that code together, it was mess.

So basically, I'm trying code above to work with for() loop, but my brain has blocked and overcomplicated.

Answer 1

This part

$i = 1;
while ($aliasCheck) 
{
    $newAlias = $oldAlias . '-' . $i;
    $aliasCheck = ShopCategoryName::where('alias', $newAlias)->first();
    $i++;
}

is equivalent to

for ($i = 1; $aliasCheck; $i++) 
{
    $newAlias = $oldAlias . '-' . $i;
    $aliasCheck = ShopCategoryName::where('alias', $newAlias)->first();
}

You can also rewrite your code to:

$oldAlias = str_slug($request->{"new_category_lang_{$value->code}"}, '-');
$newAlias = $oldAlias;
$newCategory = new ShopCategoryName; // <-- not sure what that is good for

for ($i = 1; ShopCategoryName::where('alias', $newAlias)->exists(); ++$i) 
{
    $newAlias = $oldAlias . '-' . $i;
}