There is a similar question here: Instagram: Get photos by user and tag which doesn't really solve this problem. Is it really the case that the Instagram API is just not capable of this without sifting through all Instagram images of a certain tag and finding those matching a specified username?
I am using this PHP API: https://github.com/cosenary/Instagram-PHP-API
Using the API searching by user looks like this:
https://api.instagram.com/v1/users/self/media/recent?access_token=ACCESSTOKEN&count=10
And searching by tag:
https://api.instagram.com/v1/tags/cat/media/recent?client_id=CLIENTID&count=10
I've tried this: https://api.instagram.com/v1/tags/cat/media/recent?access_token=ACCESSTOKEN with no joy.
Anyone else had better luck with this?
There is no direct way, you have to first get all photos from a user using API and then search for the hashtag using string match in photo caption or tags.
There is an implementation of this in gramfeed, for example open http://gramfeed.com/krisrak, and then use the keyword search to match hashtags