N°8681 - PHP 8.1: Fix deprecated notice for null value passed to preg_match_all()

core/attributedef.class.inc.php

@@ -4259,6 +4259,9 @@ class AttributeText extends AttributeString
 
 	public static function RenderWikiHtml($sText, $bWikiOnly = false)
 	{
+		// N°8681 - Ensure to have a string value
+		$sText = $sText ?? '';
+
 		if (!$bWikiOnly) {
 			$sPattern = '/'.str_replace('/', '\/', utils::GetConfig()->Get('url_validation_pattern')).'/i';
 			if (preg_match_all(

core/inlineimage.class.inc.php

@@ -266,6 +266,9 @@ class InlineImage extends DBObject
 	 */
 	public static function FixUrls($sHtml)
 	{
+		// N°8681 - Ensure to have a string value
+		$sHtml = $sHtml ?? '';
+
 		$aNeedles = [];
 		$aReplacements = [];
 		// Find img tags with an attribute data-img-id