$test1= ereg_replace("[\r\n]+", 'YEA', $myvalues);
<?php $myvalues = 'cars trucks automobiles'; echo 'DATA IN<br />'; echo nl2br($myvalues) . '<br />'; echo '<br />TEST 2<br />'; $test2 = str_replace("\n", "GO", $myvalues); echo nl2br($test2) . '<br />'; echo '<br />TEST 3<br />'; $test3= str_replace("\r\n", "NO", $myvalues); echo nl2br($test3) . '<br />'; echo '<br />TEST 4<br />'; $test4 = str_replace("\r\n", "", $myvalues); echo nl2br($test4) . '<br />'; ?>