WordPress Get Featured Image URL

<?php

/**
 * Get the featured image URL.
 *
 * @param string|array $size // Name of image size or an array; array( 300, 400 )
 * @param boolean $icon Use a media icon to represent the attachment.
 * @return string|boolean
 * @author Kenth Hagström
 * @version 1.0
 * @license GPL
 */
function keha76_get_image_url( $size = 'thumbnail', $icon = false ) {
    global $post;
    $src = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), $size, $icon );
    if( $src ) {
        echo $src[ 0 ];
    }
    return false;
}

?>