Feat php csv export

.gitignore

@@ -1,2 +1,3 @@
 .DS_Store
 /data/
+OUTPUT/*

README.md

@@ -61,6 +61,19 @@ HtmlQ introduces a few new settings that were not available in FlashQ:
     <item id="leaveSiteWarning">Your answers will be lost.</item>
 ```
 
+### CSV Export
+
+If your webspace supports [PHP](https://www.php.net/) then you can config HtmlQ to write all results into a CSV file. You will find the CSV file in the folder with the name `OUTPUT`. Delete the file to start a new survey.
+
+`settings/config.xml`:
+
+```xml
+    <!-- URL for data transmission via POST/GET (leave blank if not required) -->
+    <item id="submitUrl">src/save_as_csv.php</item>
+    <!-- request mode (post|get) -->
+    <item id="submitUrlMethod">get</item>
+```
+
 ## Creating unique participation links (UID)
 
 If you want to send out unique links to a HtmlQ survey that will automatically fill in the UID/user code, you can create links in the following format: [https://www.yourdomain.com/htmlq/#/?userCode=USERCODE](). In the resulting CSV file, the user code will show up in the UID field. This allows you to identify participants without requiring them to log in.

src/save_as_csv.php

@@ -0,0 +1,90 @@
+<?php
+/**
+  * This PHP script takes the results of the survey and writes it into a CSV file.
+  *
+  * Change in settings/config.xml the following:
+  *
+  *   <!-- URL for data transmission via POST/GET (leave blank if not required) -->
+  *   <item id="submitUrl">src/save_as_csv.php</item>
+  *   <!-- request mode (post|get) -->
+  *   <item id="submitUrlMethod">get</item>
+  *
+  * You will find the generate CSV file in the folder OUTPUT. Simply move or delete the file if you
+  * would like to start a new survey.
+  *
+  * @author Paul Spiesberger - no warrenty for any dataloss or other harm.
+ */
+
+$filePath = "../OUTPUT/survey_results.csv";
+
+createDir("../OUTPUT/"); // create directory if it doesn't exist yet
+
+$csvFile = fopen($filePath, "a") or die("Unable to open file!");
+
+// Extract comments
+$comments = array();
+$commentHeaders = array();
+
+for ($x = 0; $x <= 10000; $x++) {
+    $key = "comment" . $x;
+
+    if(isset($_GET[$key])) {
+        $comments[] = htmlspecialchars($_GET[$key]);
+        $commentHeaders[] = "comment" . sizeof($commentHeaders);
+    }
+}
+
+// Extract Forms
+$forms = array();
+$formHeaders = array();
+
+for ($x = 0; $x <= 10000; $x++) {
+    $key = "form" . $x;
+
+    if(isset($_GET[$key])) {
+        $forms[] = htmlspecialchars($_GET[$key]);
+        $formHeaders[] = $key;
+    }
+}
+
+// Extract Durations
+$durations = array();
+$durationHeaders = array();
+
+for ($x = 0; $x <= 10000; $x++) {
+    $key = "dur" . $x;
+
+    if(isset($_GET[$key])) {
+        $durations[] = htmlspecialchars($_GET[$key]);
+        $durationHeaders[] = $key;
+    }
+}
+
+// Adding headers  
+if (filesize($filePath) == 0) {
+
+    $headers = array("uuid", "name", "datetime", "nneg", "nneu", "npos", "sort");
+    $headers = array_merge($headers, $commentHeaders, $formHeaders, $durationHeaders);
+    fputcsv($csvFile, $headers);
+}
+
+// Create Data Arrays
+$data = array_merge(array(
+    uniqid(), // generate random UUID
+    htmlspecialchars($_GET["name"]), 
+    htmlspecialchars($_GET["datetime"]), 
+    htmlspecialchars($_GET["nneg"]), 
+    htmlspecialchars($_GET["nneu"]), 
+    htmlspecialchars($_GET["npos"]), 
+    htmlspecialchars($_GET["sort"])
+), $comments, $forms, $durations);
+
+fputcsv($csvFile, $data); // Write data
+
+fclose($csvFile); // Closing file
+
+function createDir($path, $mode = 0777, $recursive = true) {
+    if(file_exists($path)) return true;
+    return mkdir($path, $mode, $recursive);
+}
+?>