Easy to use PHP mail function for smtp using phpmailer

gistfile1.php

<?php
/*
--- Send mail using SMTP

Parameters:
to (string - required, email address of recipient)
to_name (string -optional, name of recipient
from (string - required, email address of sender)
from_name (string - optional, name of sender)
subject (string - optional, inherits 40 char from body if blank)
body (string - required, body text HTML)
attachments (string - optional, path to file)
attachments (array - optional, array of path/filenames) =>
  path (string, required if attachments is array) full path to file
	filename (string, always optional) short name of file that will be downloaded by user
  
Usage:
php_mail_smtp(array(
  'to' => 'jdoe@example.org',
  'from' => 'bob@example.org',
  'from_name' => 'bob smith',
  'body' => '<strong>Hello J!</strong>',
  'attachments' => array(
    array(
      'path' => '/var/www/my-website.com/file.jpg',
      'filename' => 'my-amazing-file.jpg'
    ),
    array(
      'path' => '/var/www/my-website.com/another-file.png'
    )
  )
));
*/

function php_mail_smtp( $args ) {
	require_once($_SERVER['DOCUMENT_ROOT'] . '/class.phpmailer.php');
		
	// Turn all argument keys into actual variables, based on key name
	extract($args);
	
	// Required arguments
	if (!$to || !$from || !$body) return false;
	
	// Inherit defaults if not set
	if (!isset($to_name) || !$to_name) $to_name = $to;
	if (!isset($from_name) || !$from_name) $from_name = $from;
	if (!isset($subject) || !$subject) $subject = substr($body, 0, 40); // First 40 chars of body as subject
	if (!isset($attachments) || !$attachments || !is_array($attachments)) 
		$attachments = array();
	
	$jobapp_email = 'sender@example.org';
	$jobapp_name = 'Email Sender';
	
	$mail = new PHPMailer;
	
	$mail->IsSMTP();                                      // Set mailer to use SMTP
	$mail->Host = 'smtp-1.example.com;smtp-2.example.com';  // Specify main and backup server
	$mail->SMTPAuth = true;                               // Enable SMTP authentication
	$mail->Username = 'sender@example.org';                            // SMTP username
	$mail->Password = 'secret';                           // SMTP password
	$mail->SMTPSecure = 'tls';                            // Enable encryption, 'ssl' also accepted

	$mail->From = $from;
	$mail->FromName = $from_name;
	$mail->AddAddress($to, $to_name);  // Add a recipient
	$mail->AddReplyTo($jobapp_email, $jobapp_name);

	$mail->WordWrap = 50;                                 // Set word wrap to 50 characters
	$mail->IsHTML(true);                                  // Set email format to HTML
	
	foreach($attachments as $attachment) {
		$path = false;
		$filename = false;
		
		// Extract path and filename, when available, or if simple string just use as path
		if ( is_array($attachment) ) {
			if (isset($attachment['path'])) $path = $attachment['path'];
			if (isset($attachment['filename'])) $filename = $attachment['filename'];
		}else{
			$path = $attachment;
		}
		
    // We couldn't find path, ignore
		if (!$path) continue;
		
		// If path isn't correct, ignore
		if ( !$path || !file_exists($path) ) continue;
		
		if ($filename) 
			$mail->AddAttachment($path, $filename);         // Add attachments
		else
			$mail->AddAttachment($path);         // Name is optional
			
	}

	$mail->Subject = $subject;
	$mail->Body    = $body;
	
	if(!$mail->Send()) {
		 echo 'Message could not be sent.';
		 echo 'Mailer Error: ' . $mail->ErrorInfo;
		 exit;
	}
	
	return true;
}