}
return (strcasecmp(substr($haystack, strlen($haystack) - strlen($needle)), $needle) === 0);
}
+
+/**
+ * Same as nl2br(), but escapes < and >
+ */
+function nl2br_escaped($html)
+{
+ return str_replace('>', '>', str_replace('<', '<', nl2br($html)));
+}
+
+/**
+ * htmlspecialchars wrapper
+ */
+function escape($str)
+{
+ return htmlspecialchars($str, ENT_COMPAT, 'UTF-8', false);
+}
+
+/**
+ * Link sanitization before templating
+ */
+function sanitizeLink(&$link)
+{
+ $link['url'] = escape($link['url']); // useful?
+ $link['title'] = escape($link['title']);
+ $link['description'] = escape($link['description']);
+ $link['tags'] = escape($link['tags']);
+}
+
+/**
+ * Checks if a string represents a valid date
+ *
+ * @param string a string-formatted date
+ * @param format the expected DateTime format of the string
+ * @return whether the string is a valid date
+ * @see http://php.net/manual/en/class.datetime.php
+ * @see http://php.net/manual/en/datetime.createfromformat.php
+ */
+function checkDateFormat($format, $string)
+{
+ $date = DateTime::createFromFormat($format, $string);
+ return $date && $date->format($string) == $string;
+}
+
+/**
+ * Generate a header location from HTTP_REFERER.
+ * Make sure the referer is Shaarli itself and prevent redirection loop.
+ *
+ * @param string $referer - HTTP_REFERER.
+ * @param string $host - Server HOST.
+ * @param array $loopTerms - Contains list of term to prevent redirection loop.
+ *
+ * @return string $referer - final referer.
+ */
+function generateLocation($referer, $host, $loopTerms = array())
+{
+ $final_referer = '?';
+
+ // No referer if it contains any value in $loopCriteria.
+ foreach ($loopTerms as $value) {
+ if (strpos($referer, $value) !== false) {
+ return $final_referer;
+ }
+ }
+
+ // Remove port from HTTP_HOST
+ if ($pos = strpos($host, ':')) {
+ $host = substr($host, 0, $pos);
+ }
+
+ if (!empty($referer) && strpos(parse_url($referer, PHP_URL_HOST), $host) !== false) {
+ $final_referer = $referer;
+ }
+
+ return $final_referer;
+}
+
+/**
+ * Checks the PHP version to ensure Shaarli can run
+ *
+ * @param string $minVersion minimum PHP required version
+ * @param string $curVersion current PHP version (use PHP_VERSION)
+ *
+ * @throws Exception the PHP version is not supported
+ */
+function checkPHPVersion($minVersion, $curVersion)
+{
+ if (version_compare($curVersion, $minVersion) < 0) {
+ throw new Exception(
+ 'Your PHP version is obsolete!'
+ .' Shaarli requires at least PHP '.$minVersion.', and thus cannot run.'
+ .' Your PHP version has known security vulnerabilities and should be'
+ .' updated as soon as possible.'
+ );
+ }
+}
?>