Stripping line breaks from a string - ereg_replace & str_replace

[Quarterbore]

I have a problem with a script in that the script saved line breaks between values that were saved. Well, the script was written that way for another purpose but now it is causing me issues...

I know I can take normal text like this and remove the /n's

$myvalues = 'cars/ntrucks/nautomibiles';

Using code like this:

$myvalues = ereg_replace('/n', '', $myvalues);

HOWEVER, I do not know how to remove LINE BREAKS which I assume would be \n in the data?

For example:

PHP Code:

<?php
$myvalues = 'cars
trucks
automibiles';
echo $myvalues . '<br />';

$myvalues = ereg_replace('/n', '', $myvalues);
echo $myvalues . '<br />';
?>

Outputs the data like this (HTML CODE):

cars
trucks
automibiles<br />cars
trucks
automibiles<br />

Can someone help be strip these line breaks out of my string?

EDIT to change the title to help someone else that may search this!