On the product details page, check the code of the next product!

 

<! -- For next & Prev link -->

<? PHP // Prev-/next-link...

// I don't quite understand why I need to assign a value: $ _ helper !!

$ _ Helper = $ this-> helper ('catalog/output ');

// Data in data [] -- use $ this-> get ();

$ _ Product = $ this-> getproduct ();

$ Prev_url = $ next_url = $ url = $ _ product-> getproducturl ();

// $ This-> helper ('catalog/data')-> getcategory (): Get the current category object. If yes, assign a value. If it does not exist, use another method to obtain

 

If ($ this-> helper ('catalog/data')-> getcategory ()){

$ Category = $ this-> helper ('catalog/data')-> getcategory ();

} Else {

// Obtain the current product and then the categoryids ("category" array). Here we only use the first one ($ _ ccats [0]), and then use Mage: GetModel () -> load () method to get the instantiated "Classification object"

$ _ Ccats = $ this-> helper ('catalog/data')-> getproduct ()-> getcategoryids ();

$ Category = Mage: GetModel ('catalog/Category ')-> load ($ _ ccats [0]);

}

 

$ Children = $ category-> getproductcollection ();

// Not very clear

$ _ COUNT = is_array ($ children )? Count ($ children): $ children-> count ();

If ($ _ count ){

Foreach ($ children as $ product ){

// Obtain the IDs of all products. Save to array $ plist.

$ Plist [] = $ product-> GETID ();

}

 

/**

* Determine the previous/next link and link to current category

*/

$ Current_pid = $ this-> helper ('catalog/data')-> getproduct ()-> GETID ();

// The array_search () function is used to find the key corresponding to a value in the array.

$ Curpos = array_search ($ current_pid, $ plist );

// Get link for Prev Product

//

$ Previd = isset ($ plist [$ curpos + 1])? $ Plist [$ curpos + 1]: $ current_pid;

$ Product = Mage: GetModel ('catalog/product')-> load ($ previd );

$ Prevpos = $ curpos;

While (! $ Product-> isvisibleincatalog ()){

$ Prevpos + = 1;

// If the next one exists, it is equal to the next one. If not, it is equal to its own

$ Nextid = isset ($ plist [$ prevpos])? $ Plist [$ prevpos]: $ current_pid;

$ Product = Mage: GetModel ('catalog/product')-> load ($ nextid );

}

$ Prev_url = $ product-> getproducturl ();

 

// Get link for next product

$ Nextid = isset ($ plist [$ curpos-1])? $ Plist [$ curpos-1]: $ current_pid;

$ Product = Mage: GetModel ('catalog/product')-> load ($ nextid );

$ Nextpos = $ curpos;

While (! $ Product-> isvisibleincatalog ()){

$ Nextpos-= 1;

//

$ Nextid = isset ($ plist [$ nextpos])? $ Plist [$ nextpos]: $ current_pid;

$ Product = Mage: GetModel ('catalog/product')-> load ($ nextid );

}

$ Next_url = $ product-> getproducturl ();

}

?>

 

 

<Div class = "prevnextcategoriesnavigation">

<Div class = "for-next">

<? PHP if ($ URL! = $ Prev_url):?>

<A class = "Next-product" href = "<? PHP echo $ prev_url;?> ">

<? PHP echo $ this->__ ('<-prev')?>

</A>

<? PHP endif;?>

</Div>

<Div class = "for-categories">

<Ul>

<Li> <? PHP echo $ this->__ ('back to categories: ')?> </LI>

<? PHP $ categories =$ _ product-> getcategoryids ();?>

<? PHP foreach ($ categories as $ K =>$ _ category_id):?>

<? PHP $ _ Category = Mage: GetModel ('catalog/Category ')-> load ($ _ category_id)?>

<Li> <a class = "back-to-catalog" href = "<? PHP echo $ _ category-> geturl ()?> "> <? PHP echo $ _ category-> getname ()?> </A> </LI>

<? PHP endforeach;?>

</Ul>

</Div>

<Div class = "for-Prev">

<? PHP if ($ URL! = $ Next_url):?>

<A class = "Prev-product" href = "<? PHP echo $ next_url;?> ">

<? PHP echo $ this->__ ('next-> ')?>

</A>

<? PHP endif;?>

</Div>

</Div>

<! -- For next & Prev link -->

 

 

// Obtain all products under the current category

$ Productcollection = $ this-> helper ('catalog/data')-> getcategory ()-> getproductcollection ();

// Obtain all categories corresponding to the current product

$ Category = $ this-> helper ('catalog/data')-> getproduct ()-> getcategoryids ();

Supplement:

1. Get store $ store = Mage: APP ()-> getstore ();

You can print $ store, which is a mage_core_model_store object. You can obtain data through the following code:

$ Store = Mage: APP ()-> getstore ()-> getdata ();

2. Get the configuration of the current store $ value = Mage: APP ()-> getstore ()-> getconfig ($ PATH)

 

 

 

First obtain the productid array, and then use this array to add and subtract keys to implement the previous and next products,

$ URL =$ _ product-> getproducturl ();

You can determine whether the URL is equal to $ prev_url or $ next_url. If the URL is equal, no next product exists and no previous product exists !!