Add image to the beginning of each post in wordpress

<?php



function easy_the_content_filter( $content ) {


        // Add image to the beginning of each page

            $content = sprintf('<img class="post-icon" src="%s/images/php.jpg" alt="Post image" title="" width="100"/>%s',get_bloginfo( 'stylesheet_directory' ),$content );
     

    // Returns the content.
    return $content;
}


?>