In your first snippet of code you have:

    $this->data["response"] = $response["data"];    $this->data["next_page"] = $response["pagination"]["next_url"];

Note two keys: response and next_page

Then in your second snippet you have:

    $this->data["pagination"] = $response["pagination"]["next_url"];    $this->data["response"] = $response["data"];

Now next_page is pagination

Now if you use

$this->api_request( $this->data["pagination"] );

But you are using $this->data["next_page"] = $response["pagination"]["next_url"]; of course you will not get the right results.

In any case try to var_dump the content of of your $request:

public function pagination_query() {    var_dump($this->data["pagination"]);    $this->api_request( $this->data["pagination"] );    $output = json_encode( $this->data["photos"] );    return $output;}

If you have a debbugger also check inside api_request which is the url passed each time

I've added the following lines of code to the try block of my try...catch statement to return several successive pages at a time:

while ( count( $this->data["photos"] ) < 160 ) {    $this-> api_request( $this->data["next_page"] );}

This essentially tells api_request to call itself until my $this->data["next_page"] array is populated with 160 "grams."

This allows me retrieve a total of 320 grams from Instagram's api: 160 grams when api_request is called after page load and another 160 from my first pagination_query call.

This isn't an ideal solution as a second pagination_query call still returns the same data from my first pagination_query call but it will have to do for the time being.

Update

The above solution is a hack. If anyone can figure out why my pagination_query method still isn't working, it would be much appreciated.