init

.gitignore

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+/vendor

composer.json

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+{
+    "require": {
+        "facebook/graph-sdk": "^5.6"
+    },
+    "autoload": {
+        "psr-4": {
+            "DieSchittigs\\StarScraper\\": "src/"
+        }
+    }
+
+}

index.php

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+<?php
+
+use DieSchittigs\StarScraper\StarRating;
+use DieSchittigs\StarScraper\GooglePlaceProvider;
+use DieSchittigs\StarScraper\FacebookPageProvider;
+
+require 'vendor/autoload.php';
+
+$starRating = new StarRating();
+$starRating->addProvider(
+	new GooglePlaceProvider(
+		'{{GoogleApiKey}}',
+		'{{GoogleMapsPlaceID}}'
+	)
+);
+$starRating->addProvider(
+	new FacebookPageProvider(
+		'{{FacebookAppID}}',
+		'{{FacebookAppSecret}}',
+		'{{FacebookPage}}'
+	)
+);
+
+$rating = $starRating->getRating();
+
+echo '
+"aggregateRating": {
+	"@type": "AggregateRating",
+	"bestRating": "'. $rating->bestRating .'",
+	"ratingCount": "'. $rating->ratingCount .'",
+	"ratingValue": "'. $rating->ratingValue .'"
+}
+';

src/FacebookPageProvider.php

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+<?php
+
+namespace DieSchittigs\StarScraper;
+
+use Facebook\Facebook;
+
+class FacebookPageProvider implements iRatingProvider{
+    private $BEST_RATING = 5;
+    private $result;
+
+    public function __construct($appID, $appSecret, $pageId){
+        $fb = new Facebook([
+            'app_id' => $appID,
+            'app_secret' => $appSecret,
+            'default_graph_version' => 'v2.10',
+            'default_access_token' => "$appID|$appSecret"
+        ]);
+        try {
+            $response = $fb->get("$pageId?fields=overall_star_rating,rating_count");
+            $this->result = $response->getDecodedBody();
+        } catch(\Facebook\Exceptions\FacebookResponseException $e) {
+            echo 'Graph returned an error: ' . $e->getMessage();
+        } catch(\Facebook\Exceptions\FacebookSDKException $e) {
+            echo 'Facebook SDK returned an error: ' . $e->getMessage();
+        }
+    }
+    public function getRating(){
+        if(
+            !$this->result ||
+            !$this->result['id'] ||
+            !$this->result['rating_count'] ||
+            !$this->result['overall_star_rating']
+        ) return null;
+        $rating = new Rating();
+        $rating->bestRating = $this->BEST_RATING;
+        $rating->ratingCount = $this->result['rating_count'];
+        $rating->ratingValue = $this->result['overall_star_rating'];
+        return $rating;
+    }
+}
+

src/GooglePlaceProvider.php

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+<?php
+
+namespace DieSchittigs\StarScraper;
+
+class GooglePlaceProvider implements iRatingProvider{
+    private $reviews;
+    private $BEST_RATING = 5;
+
+    public function __construct($GoogleApiKey, $GoogleMapsPlaceID){
+        $placeReviews = [];
+        try{
+            $placeDetails = json_decode(
+                file_get_contents("https://maps.googleapis.com/maps/api/place/details/json?placeid=$GoogleMapsPlaceID&key=$GoogleApiKey")
+            );
+            $placeReviews = $placeDetails->result->reviews;
+        } catch (\Exception $e){
+            echo 'Google API returned an error: ' . $e->getMessage();
+        }
+        if($placeReviews && is_array($placeReviews) && !empty($placeReviews)){
+            $this->reviews = $placeReviews;
+        }
+    }
+    public function getRating(){
+        if(!$this->reviews) return null;
+        $rating = new Rating();
+        $rating->bestRating = $this->BEST_RATING;
+        $rating->ratingCount = count($this->reviews);
+        $score = 0;
+        foreach($this->reviews as $review){
+            $score += $review->rating;
+        }
+        $rating->ratingValue = $score / $rating->ratingCount;
+        return $rating;
+    }
+}
+

src/Rating.php

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+<?php
+
+namespace DieSchittigs\StarScraper;
+
+class Rating{
+    public $bestRating = 0;
+    public $ratingCount = 0;
+    public $ratingValue = 0;
+}

src/StarRating.php

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+<?php
+
+namespace DieSchittigs\StarScraper;
+
+class StarRating implements iRatingProvider{
+    private $providers = [];
+    private $best_rating;
+    public function __construct($best_rating = 5){
+        $this->best_rating = $best_rating;
+    }
+    public function addProvider(iRatingProvider $provider){
+        $this->providers[] = $provider;
+    }
+    public function getRating(){
+        if(!$this->providers) return null;
+        $rating = new Rating;
+        $rating->bestRating = $this->best_rating;
+        $rating->ratingCount = 0;
+        $score = 0;
+        $validProviders = 0;
+        foreach($this->providers as $provider){
+            $_rating = $provider->getRating();
+            if(!$_rating) continue;
+            $rating->ratingCount += $_rating->ratingCount;
+            $score += $_rating->ratingValue / $_rating->bestRating * $rating->bestRating;
+            $validProviders ++;
+        }
+        $rating->ratingValue = $score / $validProviders;
+        return $rating;
+    }
+}

src/iRatingProvider.php

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+<?php
+
+namespace DieSchittigs\StarScraper;
+
+interface iRatingProvider{
+    public function getRating();
+}