help with end of line charater

I have staff inputting email addresses into a <textarea> named $list on a form and when they click submit, my php script sorts the email addresses and writes to disk. The problem is, lets say they enter the email addresses bob@mdah.state.ms.us<staff hits enter> amanda@mdah.state.ms.us<staff hits enter> sally@mdah.state.ms.us<staff hits enter> joe@mdah.state.ms.us<staff hits enter> cindy@mdah.state.ms.us<staff does not hit enter and clicks on submit button> then views the sortes email addresses, it displays as: amanda@mdah.state.ms.us bob@mdah.state.ms.us cindy@mdah.state.ms.usjoe@mdah.state.ms.us sally@mdah.state.ms.us because the staff didn't hit enter on the last line. Is there a way to read each line of input and add a carriage return if needed? I tried the code below but it did not work, nothing happened, and i don't know to examine each line to see if it ends in \r\n either. $list2 = explode("\r\n", $list); foreach ($list2 as $key => $var)

       {

       $var = $var."\r\n";

       }

$list = implode("\r\n", $list2);