How to remove extra spaces when writing to the database?

Question

PHP

I handle user input like this:

$field = strip_tags($_POST[$field]);
$field = trim($field);

If you try to enter a code with HTML tags, then the result will be written to the database in the form:

Слово1           Слово2                Слово3                   Слово4 etc...

How can you get rid of unwanted spaces?

Answer 1

$field = trim(preg_replace('/\s+/', ' ', $field));