WordPress Auto-encode Email in Content

// AUTO-ENCODE EMAIL IN CONTENT
function auto_encode_email_function( $content ){
    $addr_pattern = '/([A-Z0-9._%+-]+)@([A-Z0-9.-]+)\.([A-Z]{2,4})/i';
    preg_match_all($addr_pattern, $content, $addresses);
    $the_addrs = $addresses[0];
    for ($a = 0; $a < count($the_addrs); $a++) {
        $repaddr[$a]    = preg_replace($addr_pattern, '$1@$2.$3', $the_addrs[$a]);
        $repaddr[$a]    = antispambot( $repaddr[$a] );
        $repaddr[$a]    = '<a href="mailto:'.$repaddr[$a].'">'.$repaddr[$a].'</a>';
    }
    $new_content    = str_replace($the_addrs, $repaddr, $content);
    return $new_content;
}
add_filter( 'the_content', 'auto_encode_email_function' );