Fix strip_tags modifier for falsy input.

Fixes #890

CHANGELOG.md

@@ -6,6 +6,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- `|strip_tags` does not work if the input is 0 [#890](https://github.com/smarty-php/smarty/issues/890)
+
+## [4.3.2] - 2023-07-19
+
+### Fixed
+- `$smarty->muteUndefinedOrNullWarnings()` now also mutes PHP8 warnings for undefined properties
+
 ## [4.3.1] - 2023-03-28
 
 ### Security

libs/Smarty.class.php

@@ -107,7 +107,7 @@ class Smarty extends Smarty_Internal_TemplateBase
     /**
      * smarty version
      */
-    const SMARTY_VERSION = '4.3.1';
+    const SMARTY_VERSION = '4.3.2';
     /**
      * define variable scopes
      */

libs/debug.tpl

@@ -167,9 +167,7 @@
     </html>
 {/capture}
 <script type="text/javascript">
-    {$id = '__Smarty__'}
-    {if $display_mode}{$id = "$offset$template_name"|md5}{/if}
-    _smarty_console = window.open("", "console{$id}", "width=1024,height=600,left={$offset},top={$offset},resizable,scrollbars=yes");
+    _smarty_console = window.open("", "console{$targetWindow}", "width=1024,height=600,left={$offset},top={$offset},resizable,scrollbars=yes");
     _smarty_console.document.write("{$debug_output|escape:'javascript' nofilter}");
     _smarty_console.document.close();
 </script>

libs/plugins/modifiercompiler.strip_tags.php

@@ -21,7 +21,7 @@
 function smarty_modifiercompiler_strip_tags($params)
 {
     if (!isset($params[ 1 ]) || $params[ 1 ] === true || trim($params[ 1 ], '"') === 'true') {
-        return "preg_replace('!<[^>]*?>!', ' ', {$params[0]} ?: '')";
+        return "preg_replace('!<[^>]*?>!', ' ', (string) {$params[0]})";
     } else {
         return 'strip_tags((string) ' . $params[ 0 ] . ')';
     }

libs/sysplugins/smarty_internal_debug.php

@@ -238,9 +238,12 @@ class Smarty_Internal_Debug extends Smarty_Internal_Data
         $_config_vars = $ptr->config_vars;
         ksort($_config_vars);
         $debugging = $smarty->debugging;
+        $templateName = $obj->source->type . ':' . $obj->source->name;
+        $displayMode = $debugging === 2 || !$full;
+        $offset = $this->offset * 50;
         $_template = new Smarty_Internal_Template($debObj->debug_tpl, $debObj);
         if ($obj->_isTplObj()) {
-            $_template->assign('template_name', $obj->source->type . ':' . $obj->source->name);
+            $_template->assign('template_name', $templateName);
         }
         if ($obj->_objType === 1 || $full) {
             $_template->assign('template_data', $this->template_data[ $this->index ]);
@@ -250,8 +253,8 @@ class Smarty_Internal_Debug extends Smarty_Internal_Data
         $_template->assign('assigned_vars', $_assigned_vars);
         $_template->assign('config_vars', $_config_vars);
         $_template->assign('execution_time', microtime(true) - $smarty->start_time);
-        $_template->assign('display_mode', $debugging === 2 || !$full);
-        $_template->assign('offset', $this->offset * 50);
+        $_template->assign('targetWindow', $displayMode ? md5("$offset$templateName") : '__Smarty__');
+        $_template->assign('offset', $offset);
         echo $_template->fetch();
         if (isset($full)) {
             $this->index--;

libs/sysplugins/smarty_internal_errorhandler.php

@@ -17,6 +17,12 @@ class Smarty_Internal_ErrorHandler
      */
     public $allowUndefinedVars = true;
 
+    /**
+     * Allows {$foo->propName} where propName is undefined.
+     * @var bool
+     */
+    public $allowUndefinedProperties = true;
+
     /**
      * Allows {$foo.bar} where bar is unset and {$foo.bar1.bar2} where either bar1 or bar2 is unset.
      * @var bool
@@ -80,6 +86,13 @@ class Smarty_Internal_ErrorHandler
             return; // suppresses this error
         }
 
+        if ($this->allowUndefinedProperties && preg_match(
+                '/^(Undefined property)/',
+                $errstr
+            )) {
+            return; // suppresses this error
+        }
+
         if ($this->allowUndefinedArrayKeys && preg_match(
             '/^(Undefined index|Undefined array key|Trying to access array offset on value of type)/',
             $errstr

tests/UnitTests/TemplateSource/TagTests/PluginModifier/PluginModifierStripTagsTest.php

@@ -0,0 +1,46 @@
+<?php
+/**
+ * Smarty PHPunit tests of modifier
+ */
+
+namespace UnitTests\TemplateSource\TagTests\PluginModifier;
+use PHPUnit_Smarty;
+
+/**
+ * class for modifier tests
+ *
+ * @runTestsInSeparateProcess
+ * @preserveGlobalState disabled
+ * @backupStaticAttributes enabled
+ */
+class PluginModifierStripTagsTest extends PHPUnit_Smarty {
+
+	public function setUp(): void {
+		$this->setUpSmarty(__DIR__);
+	}
+
+	public function testDefault() {
+		$tpl = $this->smarty->createTemplate('string:{$x|strip_tags}');
+		$tpl->assign('x', '<b>hi</b>');
+		$this->assertEquals(" hi ", $this->smarty->fetch($tpl));
+	}
+
+	public function testParam1() {
+		$tpl = $this->smarty->createTemplate('string:{$x|strip_tags:false}');
+		$tpl->assign('x', '<b>hi</b>');
+		$this->assertEquals("hi", $this->smarty->fetch($tpl));
+	}
+
+	public function testInputIsFalsy0() {
+		$tpl = $this->smarty->createTemplate('string:{$x|strip_tags}');
+		$tpl->assign('x', 0);
+		$this->assertEquals("0", $this->smarty->fetch($tpl));
+	}
+
+	public function testInputIsFalsy1() {
+		$tpl = $this->smarty->createTemplate('string:{$x|strip_tags}');
+		$tpl->assign('x', '');
+		$this->assertEquals("", $this->smarty->fetch($tpl));
+	}
+
+}