PHP Remove extra spaces between break lines - php

Question

I have a string in PHP, i'm able to remove multiple continuous break lines and multiple spaces, but what i'm still not able is to remove multiple break lines if i have an space in the middle.
For example:
Text \r\n \r\n extra text
I would like to clean this text as:
Text \r\nextra text
Could also be too:
Text \r\n \r\nextra text
Don't need to be an extra espace after the break line.
What i have right now is:
function clearHTML($text){
$text = strip_tags($text);
$text = str_replace(" ", " ", $text);
$text = preg_replace("/[[:blank:]]+/"," ",$text);
$text = preg_replace("/([\r\n]{4,}|[\n]{2,}|[\r]{2,})/", "\r\n", $text);
$text = trim($text);
return $text;
}
Any suggestions?

Answer 1

To remove extra whitespace between lines, you can use
preg_replace('~\h*(\R)\s*~', '$1', $text)
The regex matches:
\h* - 0 or more horizontal whitespaces
(\R) - Group 1: any line ending sequence (the replacement is $1, just this group vaue)
\s* - one or more whitespaces
The whitespace shrinking part can be merged to a single preg_replace call with the (?: |\h)+ regex that matches one or more occurrences of an string or a horizontal whitespace.
NOTE: If you have Unicode texts, you will need u flag.
The whole cleaning function can look like
function clearHTML($text){
$text = strip_tags($text);
$text = preg_replace("~(?: |\h)+~u", " ", $text);
$text = preg_replace('~\h*(\R)\s*~u', '$1', $text);
return trim($text);
}