Restructures demos.

demos/php/.vscode/launch.json

@@ -0,0 +1,17 @@
+{
+	// Use IntelliSense to find out which attributes exist for C# debugging
+	// Use hover for the description of the existing attributes
+	// For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"name": "PHP - Demo",
+			"type": "php",
+			"request": "launch",
+			"program": "${workspaceFolder}/php/demo.php",
+			"xdebugSettings": {
+				"max_data": -1
+			}
+		}
+	]
+}

demos/php/.vscode/settings.json

@@ -0,0 +1,8 @@
+{
+	"debugVisualizer.debugAdapterConfigurations": {
+		"php": {
+			"context": "watch",
+			"expressionTemplate": "${expr}"
+		}
+	}
+}

demos/php/.vscode/tasks.json

@@ -0,0 +1,32 @@
+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "npm",
+			"label": "typescript-watch",
+			"script": "dev",
+			"problemMatcher": "$tsc-watch",
+			"isBackground": true,
+			"presentation": {
+				"reveal": "never"
+			},
+			"path": "js/",
+			"group": {
+				"kind": "build",
+				"isDefault": true
+			}
+		},
+		{
+			"label": "csharp-build",
+			"command": "dotnet",
+			"type": "process",
+			"args": [
+				"build",
+				"${workspaceFolder}/csharp/demo.csproj",
+				"/property:GenerateFullPaths=true",
+				"/consoleloggerparameters:NoSummary"
+			],
+			"problemMatcher": "$msCompile"
+		}
+	]
+}

demos/php/demo.php

@@ -0,0 +1,33 @@
+<?php
+
+// Install php, xdebug and the php debug extension for VS Code
+// (https://marketplace.visualstudio.com/items?itemName=felixfbecker.php-debug).
+
+// The Debug Visualizer has no support for PHP data extractors yet,
+// so to visualize data, your value must be a valid JSON string representing the data.
+// See readme for supported data schemas.
+
+$graph = [
+    "kind" => ["graph" => true],
+    "nodes" => [
+        ["id" => "1", "label" => "1"]
+    ],
+    "edges" => []
+];
+// Visualize "$visualize()"
+$visualize = function () use (&$graph) {
+    return json_encode($graph);
+};
+
+for ($i = 2; $i < 100; $i++) {
+    // add a node
+    $id = "" . $i;
+    array_push($graph["nodes"],
+        ["id" => $id, "label" => $id]);
+    // connects the node to a random edge
+    $targetId = "" . random_int(1, $i - 1);
+    array_push($graph["edges"],
+        ["from" => $id, "to" => "" . $targetId]);
+}
+
+echo "finished";