1 files changed, 32 insertions, 0 deletions
diff --git a/src/web/lib/ie.php b/src/web/lib/ie.php
new file mode 100644
index 0000000..ead6c1a
--- /dev/null
+++ b/src/web/lib/ie.php
@@ -0,0 +1,32 @@
+<?php /* Copyright (c) 2024 Freya Murphy */
+
+/// IE 5 though 8 support IE conditional comments
+/// IE 4 does not (need to fall back to user agent)
+
+{
+	if (preg_match('/MSIE\s(?P<v>\d+)/i', @$_SERVER['HTTP_USER_AGENT'], $B)) {
+		define('IE_VERSION', $B['v']);
+	} else {
+		define('IE_VERSION', FALSE);
+	}
+
+	if (IE_VERSION == FALSE || IE_VERSION > 4) {
+		// ADD COND COMMENTS
+		define('IE_START', "<!--[if lt IE 8 ]>");
+		define('IE_END', "<![endif]-->");
+	} else {
+		// IE4 DETECTED, DO NOT ADD COMMENTS
+		define('IE_START', '');
+		define('IE_END', '');
+	}
+}
+
+function ie(string $inner) {
+	return IE_START . $inner . IE_END;
+}
+
+function ie_ua(string $inner, int $ver) {
+	if (IE_VERSION == $ver)
+		return $inner;
+	return '';
+}