recipients from text file php mail - php

Question

I have a emails.txt file with name and email Example: John, john#gmail.com
I can try to export with a different way the emails.txt (for example name: john email: john#gmail.com)
but the important part is
I want to send emails for all recipients that exist in emails.txt using his names to edit the message
$file = fopen("emails.txt", "r") or die("Unable to open file!");
//while(!feof($file)){
$line = fgets($file);
$to = $line;
$subject = "This is subject";
$message = 'Hello Mr %NAME%!';
$header = "From:TESTE \r\n";
$header .= "MIME-Version: 1.0\r\n";
$header .= "Content-type: text/html\r\n";
$retval = mail ($to,$subject,$message,$header);
if( $retval == true ) {
echo "Message sent successfully...";
}else {
echo "Message could not be sent...";
}
fclose($file);

Answer 1

Using explode() to break up the parts of email.txt will give you what you need:
list($name, $to) = explode(",", $line);
$message = sprintf('Hello Mr %s!', $name);
This is based on every row within emails.txt being formatted correctly and clearly such as John Smith, john.smith#example.com
You can also change the code entirely to use str_getcsv() which I will let you look into.