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.'/SforceEnterpriseClient.php');
require_once ('../userAuth.php');
try {
  $mySforceConnection = new SforceEnterpriseClient();
  $mySoapClient = $mySforceConnection->createConnection(SOAP_CLIENT_BASEDIR.'/enterprise.wsdl.xml');
  $mylogin = $mySforceConnection->login($USERNAME, $PASSWORD);

  $singleEmail1 = new SingleEmailMessage();
  $singleEmail1->setToAddresses(array($eEMAILID));
  $singleEmail1->setPlainTextBody('My message');
  $singleEmail1->setSubject("A Single Email");
  $singleEmail1->setSaveAsActivity(true);
  $singleEmail1->setEmailPriority(EMAIL_PRIORITY_LOW);
  
  echo "***** Send Emails *****\n";
  $emailResponse = $mySforceConnection->sendSingleEmail(array($singleEmail1));

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

Sample Output

stdClass Object
(
    [success] => 1
)