replaced duplicated spaces with PHP

duplicated.php

<?php

//Replacing multiple spaces with a single space simple single line of php code:
$output = preg_replace('/\s+/', ' ', $input);

//This mean that spaces, tabs or line breaks (one or more) will be replaced by a single space.
//Replace multiple spaces with one space:
$output = preg_replace('/\s+/', ' ', $input);
//Replace one or multiple tabs with one space:
$output = preg_replace('/\t+/', ' ', $input);
//Replace one or multiple new lines with one space:
$output = preg_replace('/\n\r+/', ' ', $input);