Added interpreter for pseudocode for displaying exhibitions, events.

Added basic search.
Added object pages.

inc/functions.php

@@ -69,13 +69,15 @@ function ensureEnvironment() {
 
     $settings = array_merge(
         [
-            "startPage"   => "1",
-            "pageTitle"   => "md:cms",
-            "logo"        => "",
-            "url"         => "",
-            "mdVersion"   => "https://www.museum-digital.de/nat/",
-            "maxFileSize" => 300000,
-            "defaultLang" => "en"
+            "startPage"             => "1",
+            "pageTitle"             => "md:cms",
+            "logo"                  => "",
+            "url"                   => "",
+            "cacheRefreshInterval"  => 0,
+            "mdVersion"             => "https://rlp.museum-digital.de/",
+            "mdImgFolder"           => "https://rlp.museum-digital.de/data/rlp/",
+            "maxFileSize"           => 300000,
+            "defaultLang"           => "en"
         ],
         json_decode(file_get_contents(__DIR__ . "/../data/settings.json"), true)
     );
@@ -109,6 +111,42 @@ function loadPublicPages() {
 
 }
 
+/**
+ * Query or cache pages.
+ *
+ * @param string $url      URL to query.
+ * @param string $area     The type of the queried page. If caching is enabled, renew cache every X seconds.
+ * @param array  $settings Settings variable.
+ *
+ * @return array
+ */
+function queryCachePage(string $url, string $area = "", array $settings = ['cacheRefreshInterval' => 0]) {
+
+    // Ignore caching if cacheRefreshInterval equals zero.
+    if ($settings['cacheRefreshInterval'] == 0) {
+        return file_get_contents($url);
+    }
+
+    $fileDir = __DIR__ . "/../data/caches/$area";
+    ensureDir($fileDir);
+
+    $fileName = md5($url);
+    $filePath = "$fileDir/$fileName.json";
+
+    // Load from cache.
+    if (file_exists($filePath) && time() - filemtime($filePath) < $settings['cacheRefreshInterval']) {
+        return file_get_contents($filePath);
+    }
+
+    // Refresh cache.
+
+    $contents = file_get_contents($url);
+    file_put_contents($filePath, $contents, LOCK_EX);
+
+    return $contents;
+
+}
+
 /**
  * Function scanDirConts is a wrapper around scandir(), which removes [".", ".."].
  *
@@ -320,4 +358,78 @@ function checkPreviewAccess($sessionStarted = false) {
 
 }
 
+/**
+ * Function checking if a string starts with another.
+ *
+ * @param string $haystack String to check.
+ * @param string $needle   Potential start of $haystack.
+ *
+ * @return boolean
+ */
+function startswith(string $haystack, string $needle):bool {
+    if (substr($haystack, 0, strlen($needle)) == $needle) return (true);
+    else return (false);
+}
+
+/**
+ * Function checking if a string starts with any input from the input array.
+ *
+ * @param string   $haystack String to check.
+ * @param string[] $needles  Array containing potential start values of $haystack.
+ *
+ * @return boolean
+ */
+function startswithAny(string $haystack, array $needles):bool {
+    $output = false;
+    foreach ($needles as $needle) {
+        $output = startswith($haystack, $needle);
+        if ($output == true) return $output;
+    }
+    return $output;
+}
+
+/**
+ * Curling web pages.
+ * Function to check errors.
+ *
+ * @param string $url  URL to query.
+ * @param string $host Authentication data. Optional.
+ *
+ * @return string
+ */
+function runCurl(string $url, string $host = ""):string {
+
+    $curl = curl_init();
+
+    curl_setopt($curl, CURLOPT_URL, $url);
+    // curl_setopt($curl, CURLOPT_RESOLVE, ["www.example.com:443:172.16.1.1"]);
+    curl_setopt($curl, CURLOPT_ENCODING, '');
+    if ($host) curl_setopt($ch, CURLOPT_HTTPHEADER, array("Host: $host"));
+    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
+    $result = curl_exec($curl);
+
+    curl_close($curl);
+    return $result;
+
+}
+
+/**
+ * This function cuts down a string and adds a period in case it's longer than length to create a snippet.
+ *
+ * @param string $string Input text to cut down
+ * @param int    $length Length of the snippet to create
+ *
+ * @return string
+ */
+function createTextSnippet($string, $length) {
+
+    if (strlen($string) > $length) {
+        $string  = substr($string, 0, $length);
+        $string  = substr($string, 0, strrpos($string, ' '));
+        $string .= ' ...';
+    }
+    return $string;
+
+}
+
 ?>