Add Custom URL field to Categories and Show it on Category Page

//add extra fields to category edit form hook
add_action ( ‘edit_category_form_fields’, ‘extra_category_fields’);
//add extra fields to category edit form callback function
function extra_category_fields( $tag ) { //check for existing featured ID
$t_id = $tag->term_id;
$cat_meta = get_option( “category_$t_id”);
?>

<input type="text" name="Cat_meta[img]" id="Cat_meta[img]" size="3" style="width:60%;" value="”>
<input type="text" name="Cat_meta[extra1]" id="Cat_meta[extra1]" size="25" style="width:60%;" value="”>
<input type="text" name="Cat_meta[extra2]" id="Cat_meta[extra2]" size="25" style="width:60%;" value="”>
<?php
}

// save extra category extra fields hook
add_action ( 'edited_category', 'save_extra_category_fields');
// save extra category extra fields callback function
function save_extra_category_fields( $term_id ) {
if ( isset( $_POST['Cat_meta'] ) ) {
$t_id = $term_id;
$cat_meta = get_option( "category_$t_id");
$cat_keys = array_keys($_POST['Cat_meta']);
foreach ($cat_keys as $key){
if (isset($_POST['Cat_meta'][$key])){
$cat_meta[$key] = $_POST['Cat_meta'][$key];
}
}
//save the option array
update_option( "category_$t_id", $cat_meta );
}
}

add_action ( 'category_add_form_fields', 'extra_category_fields');