Why value returned in preg_replace_callback is string ?

[petrogromovo]

Hi all,
I need to make an array from string by more 1 space. I do it with code:
 

$subject = "
Line one    Line Two    Line Three               LineLast
";
 $result = preg_match_all("~(.+)\b(?:[\s]{2,}|$)~U", $subject, $matches);

It works, but I need to trim all elements inside of $matches :

$matches = preg_replace_callback($validPattern, array($this, "trimStringValue"), $subject, limit: -1);
public function trimStringValue($matches)
{
    return trim($matches[1]);
}

 

But value of $matches after preg_replace_callback has concatanated string of all arrays in $subject,   
but not array of trimmed lines as I need.

Why so and how that can be fixed ?

Thanks in advance!

 

[kicken]

The function you want is preg_split, not preg_match_all or preg_replace_callback.