Question

On my slug column I set the limit is varchar = 100 and the values will store like this

how-do-i-truncate-a-string-with-dynamic-length-url-slug

I want the slug will be a unique key so I update the slug value with last auto increment id and new slug value is :

how-do-i-truncate-a-string-with-dynamic-length-url-slug-10

So here the last auto increment will be a big number at the end..

preg_replace('/\s+?(\S+)?$/', '', substr($slugwithautoincrement, 0, 101));

With this preg_replace it will remove my auto increment number

Question :

How do I truncate the value fix to 100 characters without remove the last auto increment number?

So result should be :

how-do-i-truncate-a-string-with-[....remove from here...]10

Answer 1

If you can’t truncate before appending the auto increment value:

$slug = explode('-', $slug);

$value = array_pop($slug);

$slug = substr(implode('-', $slug), 0, 99 - strlen($value)) . '-' . $value;