DOC-5544 added string data type example for PHP

Author: andy-stark-redis

local_examples/php/DtStringTest.php

@@ -0,0 +1,88 @@
+// EXAMPLE: set_tutorial
+<?php
+
+require 'vendor/autoload.php';
+
+use Predis\Client as PredisClient;
+
+class DtStringTest
+// REMOVE_START
+extends PredisTestCase
+// REMOVE_END
+{
+    public function testDtString() {
+        $r = new PredisClient([
+            'scheme'   => 'tcp',
+            'host'     => '127.0.0.1',
+            'port'     => 6379,
+            'password' => '',
+            'database' => 0,
+        ]);
+        // REMOVE_START
+        $r->flushall();
+        // REMOVE_END
+
+        // STEP_START set_get
+        $res1 = $r->set('bike:1', 'Deimos');
+        echo "$res1" . PHP_EOL;
+        // >>> OK
+
+        $res2 = $r->get('bike:1');
+        echo "$res2" . PHP_EOL;
+        // >>> Deimos
+        // STEP_END
+        // REMOVE_START
+        $this->assertEquals('OK', $res1);
+        $this->assertEquals('Deimos', $res2);
+        // REMOVE_END
+
+        // STEP_START setnx_xx
+        $res3 = $r->set('bike:1', 'bike', 'nx');
+        echo "$res3" . PHP_EOL;
+        // >>> (null)
+        
+        echo $r->get('bike:1') . PHP_EOL;
+        // >>> Deimos
+
+        $res4 = $r->set('bike:1', 'bike', 'xx');
+        echo "$res4" . PHP_EOL;
+        // >>> OK
+        // STEP_END
+        // REMOVE_START
+        $this->assertEquals(null, $res3);
+        $this->assertEquals('OK', $res4);
+        $this->assertEquals('bike', $r->get('bike:1'));
+        // REMOVE_END
+
+        // STEP_START mset
+        $res5 = $r->mset([
+            'bike:1' => 'Deimos', 'bike:2' => 'Ares', 'bike:3' => 'Vanth'
+        ]);
+        echo "$res5" . PHP_EOL;
+        // >>> OK
+
+        $res6 = $r->mget(['bike:1', 'bike:2', 'bike:3']);
+        echo json_encode($res6) . PHP_EOL;
+        // >>> ["Deimos","Ares","Vanth"]
+        // STEP_END
+        // REMOVE_START
+        $this->assertEquals('OK', $res5);
+        $this->assertEquals(['Deimos', 'Ares', 'Vanth'],  $res6);
+        // REMOVE_END
+
+        // STEP_START incr
+        $r->set('total_crashes', 0);
+        $res7 = $r->incr('total_crashes');
+        echo "$res7" . PHP_EOL;
+        // >>> 1
+
+        $res8 = $r->incrby('total_crashes', 10);
+        echo "$res8" . PHP_EOL;
+        // >>> 11
+        // STEP_END
+        // REMOVE_START
+        $this->assertEquals(1, $res7);
+        $this->assertEquals(11, $res8);
+        // REMOVE_END
+    }
+}