Checking gravatar is there or not in wordpress

checking_gravatar.php

<?php
/* Function for check gravatar */

function check_avatar($user_email_id) {

    $hash = md5(strtolower(trim($user_email_id)));
    $uri = 'http://www.gravatar.com/avatar/' . $hash . '?d=404';
    $headers = @get_headers($uri);
    if (!preg_match("|200|", $headers[0])) {
        $has_valid_avatar = FALSE;
    } else {
        $has_valid_avatar = TRUE;
    }
    return $has_valid_avatar;
}

/* Getting user_id and email */
$current_user_id = get_current_user_id();

$user_info = get_userdata($current_user_id);
$user_email_id = $user_info->user_email;

/* Getting User first name and last name */
$u_first_name = $user_info->user_firstname;
$u_last_name = $user_info->user_lastname;


/* If true displays gravatar else display defaut imag */
if (check_avatar($user_email_id) == "TRUE") {

    echo get_avatar($user_email_id, 32);
} else {
    ?>

    <!-- Genarating Name text avatar -->
    <div class="name"><?php echo $u_first_name; ?>&nbsp;<?php echo $u_last_name; ?></div>

<?php } ?>