在构建字符串php时添加换行符

Question

i have been looking all over and i cant find the answer. i am sure this is easy

i am sending an email, and in the body are names of clients

the code looks for clients that fit the search conditions and as each one is found it goes into a loop

while($row = mysql_fetch_array($result)) {
 $clients = $clients . $first_name . ???
}

the result should be

Client1
Client2
Client3

but what i keep getting is:

Client1Client2Client3

I have tried

     $clients = $clients . $first_name . lf;
     $clients = $clients . $first_name . cr;
     $clients = $clients . $first_name . '
';

but always the same result

TIA

Answer 1

If your output will be the command line, file, etc. Use PHP_EOL. If it will be a web browser use <br>:

while($row = mysql_fetch_array($result)) {
    $clients = $clients . $first_name . PHP_EOL;
}

while($row = mysql_fetch_array($result)) {
    $clients = $clients . $first_name . "<br/>";
}