DOC-5678 top-k examples

Author: andy-stark-redis

local_examples/php/DtTopkTest.php

@@ -0,0 +1,60 @@
+// EXAMPLE: topk_tutorial
+<?php
+
+require 'vendor/autoload.php';
+
+use Predis\Client as PredisClient;
+
+class DtTopkTest
+// REMOVE_START
+extends PredisTestCase
+// REMOVE_END
+{
+    public function testDtTopk() {
+        $r = new PredisClient([
+            'scheme'   => 'tcp',
+            'host'     => '127.0.0.1',
+            'port'     => 6379,
+            'password' => '',
+            'database' => 0,
+        ]);
+        // REMOVE_START
+        $r->flushall();
+        // REMOVE_END
+
+        // STEP_START topk
+        $res1 = $r->topkreserve('bikes:keywords', 5, 2000, 7, 0.925);
+        echo $res1 . PHP_EOL;
+        // >>> OK
+
+        $res2 = $r->topkadd(
+            'bikes:keywords',
+            'store',
+            'seat',
+            'handlebars',
+            'handles',
+            'pedals',
+            'tires',
+            'store',
+            'seat',
+        );
+        echo json_encode($res2) . PHP_EOL;
+        // >>> [null,null,null,null,null,"handlebars",null,null]
+
+        $res3 = $r->topklist('bikes:keywords');
+        echo json_encode($res3) . PHP_EOL;
+        // >>> ["store","seat","pedals","tires","handles"]
+
+        $res4 = $r->topkquery('bikes:keywords', 'store', 'handlebars');
+        echo json_encode($res4) . PHP_EOL;
+        // >>> [1,0]
+        // STEP_END
+        // REMOVE_START
+        $this->assertEquals('OK', $res1);
+        $this->assertEquals([null, null, null, null, null, 'handlebars', null, null], $res2);
+        $this->assertEquals(['store','seat','pedals','tires','handles'], $res3);
+        $this->assertEquals([1,0], $res4);
+        // REMOVE_END
+    }
+}
+