Send message to the emails included in the file

This function is used for sending message to the emails included in the file text.

<?php
function send_message_to_emails_included_in_file($file,$subject,$message,$headers="", $parameters=""){
if(file_exists($file)){
$content = file_get_contents($file, true);
preg_match_all('/(\w+\.)*\w+@(\w+\.)*\w+(\w+\-\w+)*\.\w+/', $content, $emails, PREG_PATTERN_ORDER);

$emails = $emails[0];
$emails = array_unique($emails);

foreach($emails as $email){
mail($email,$subject,$message,$headers,$parameters);
}
return true;
}else{
return false;
}
}

$file = "file.txt"; // the path of the file
$subject = "Hello"; // email subject
$message = "This is a test message."; // email massage
$headers = "From: rubensargsyan.com"; // email headers

send_message_to_emails_included_in_file($file,$subject,$message,$headers);
?>


If the file is not found the function return false.