Sample Call

<?php
// SOAP_CLIENT_BASEDIR - folder that contains the PHP Toolkit and your WSDL
// $USERNAME - variable that contains your Salesforce.com username (must be in the form of an email)
// $PASSWORD - variable that contains your Salesforce.com password

define("SOAP_CLIENT_BASEDIR", "../../soapclient");
require_once (SOAP_CLIENT_BASEDIR.'/SforcePartnerClient.php');
require_once ('../userAuth.php');

try {
  $mySforceConnection = new SforcePartnerClient();
  $mySoapClient = $mySforceConnection->createConnection(SOAP_CLIENT_BASEDIR.'/partner.wsdl.xml');
  $mylogin = $mySforceConnection->login($USERNAME, $PASSWORD);

/*--------------------------------------------------------\
| Please manage the values for email id from file userAuth
\--------------------------------------------------------*/

  $singleEmail1 = new SingleEmailMessage();
  $singleEmail1->toAddresses = $EMAILID;
  $singleEmail1->plainTextBody = "Hello there";
  $singleEmail1->subject = "First Single Email";
  $singleEmail1->saveAsActivity = true;
  $singleEmail1->emailPriority = EMAIL_PRIORITY_LOW;

  $singleEmail2 = new SingleEmailMessage();
  $singleEmail2->toAddresses = $EMAILID;
  $singleEmail2->plainTextBody = "Hello there";
  $singleEmail2->subject = "Second Single Email";
  $singleEmail2->saveAsActivity = true;
  $singleEmail2->emailPriority = EMAIL_PRIORITY_LOW;

  echo "***** Send Emails *****\n";
  $emailResponse = $mySforceConnection->sendSingleEmail(array ($singleEmail1, $singleEmail2));

  print_r($emailResponse);

} catch (Exception $e) {
  echo $mySforceConnection->getLastRequest();
  echo $e->faultstring;
}
?>

Sample Output