help with end of line charater

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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@xxxxxxxxxxxxxxxx<staff hits enter>
amanda@xxxxxxxxxxxxxxxx<staff hits enter>
sally@xxxxxxxxxxxxxxxx<staff hits enter>
joe@xxxxxxxxxxxxxxxx<staff hits enter>
cindy@xxxxxxxxxxxxxxxx<staff does not hit enter and clicks on submit button>

then views the sortes email addresses, it displays as:

amanda@xxxxxxxxxxxxxxxx
bob@xxxxxxxxxxxxxxxx
cindy@xxxxxxxxxxxxxxxxxxx@mdah.state.ms.us
sally@xxxxxxxxxxxxxxxx

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);







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