From e867407ae8b86b3170f0f103607d54a0fb7c616e Mon Sep 17 00:00:00 2001
From: Christian Schneider
Date: Mon, 24 Jan 2022 17:54:06 +0100
Subject: Fix PHP 8.1 warning when URL given to U() is invalid

---
 it_html.class     | 3 +++
 test/U_tests.json | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/it_html.class b/it_html.class
index 70994e7..d65b101 100644
--- a/it_html.class
+++ b/it_html.class
@@ -502,7 +502,10 @@ static function U(...$args)
 	$base = preg_replace('|\0|', '', $base); # kill null chars
 
 	if (!($u = @parse_url($base)))
+	{
+		$u = [];
 		list($u['path'], $u['query']) = explode("?", $base, 2);
+	}
 
 	$u['host'] = preg_match('/[^-_.0-9a-z]/i', $u['host']) && function_exists('idn_to_ascii') && ($idnahost = idn_to_ascii($GLOBALS['it_html']->p['charset'] == "iso-8859-1" ? utf8_encode($u['host']) : $u['host'])) ? $idnahost : $u['host'];	# Punycode hostname to include into webpage
 	$u['host'] = preg_replace_callback('/[^-_.0-9a-z\x80-\xff]/i', function($m) { return rawurlencode($m[0]); }, $u['host']); # Encode garbage chars in host
diff --git a/test/U_tests.json b/test/U_tests.json
index 0025565..83a6771 100644
--- a/test/U_tests.json
+++ b/test/U_tests.json
@@ -219,5 +219,11 @@
 		"args": ["a:b:c:d:javascript:alert('fail');"],
 		"exp": "alert(%27fail%27)%3B",
 		"name": "U() remove multiple schemes from path"
+	},
+
+	{
+		"args": ["//Oeffnungszeiten:8.30-17.00/"],
+		"exp": "//Oeffnungszeiten:8.30-17.00/",
+		"name": "U() with invalid URL"
 	}
 ]
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