Remove multiple whitespaces

You need:

$ro = preg_replace('/\s+/', ' ', $row['message']);

You are using \s\s+ which means whitespace(space, tab or newline) followed by one or more whitespace. Which effectively means replace two or more whitespace with a single space.

What you want is replace one or more whitespace with single whitespace, so you can use the pattern \s\s* or \s+ (recommended)

<?php
$str = "This is  a string       with
spaces, tabs and newlines present";

$stripped = preg_replace(array('/\s{2,}/', '/[\t\n]/'), ' ', $str);

echo $str;
echo "\n---\n";
echo "$stripped";
?>

This outputs

This is  a string   with
spaces, tabs and newlines present
---
This is a string with spaces, tabs and newlines present

preg_replace('/[\s]+/mu', ' ', $var);

\s already contains tabs and new lines, so this above regex appears to be sufficient.

simplified to one function:

function removeWhiteSpace($text)
{
    $text = preg_replace('/[\t\n\r\0\x0B]/', '', $text);
    $text = preg_replace('/([\s])\1+/', ' ', $text);
    $text = trim($text);
    return $text;
}

based on Danuel O'Neal answer.

$str='This is   a Text \n and so on Text text.';
print preg_replace("/[[:blank:]]+/"," ",$str);