PHP LDAP Lookup

I have a PHP webpage that captures the username of the person connecting to it.

I now need to do a lookup in Active Directory to get the email address (SecurityPincipal.sAMAccountName)

I have had some success with the below code, in it will bind successfully with LDAP but does not return anything

<?php

//using ldap bind anonymously

// connect to ldap server
$ldapconn = ldap_connect("global.tesco.org")
    or die("Could not connect to LDAP server.");

if ($ldapconn) {

    // binding anonymously
    $ldapbind = ldap_bind($ldapconn);

    if ($ldapbind) {
        echo "LDAP bind anonymous successful...";

        ldap_set_option($ldapconn, LDAP_OPT_PROTOCOL_VERSION,3);
        ldap_set_option($ldapconn, LDAP_OPT_REFERRALS,0);

        $dn = "CN=Users,DC=name,DC=name,DC=org"; 
        $filter="(sAMAccountName=username)";
        $justthese = array("ou", "sn", "givenname", "mail");

        $sr=ldap_search($ldapconn, $dn, $filter, $justthese);

        $info = ldap_get_entries($ldapconn, $sr);

        echo $info["count"]." entries returned\n";

    } else {
        echo "LDAP bind anonymous failed...";
    }
}
?>

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