Merge branch 'release/4.1.1'

PHP 8.1: fix deprecation in escape modifier

.gitattributes

@@ -7,7 +7,10 @@
 
 # exclude from git export
 /tests export-ignore
-/utilities/ export-ignore
+/demo export-ignore
+/docs export-ignore
+/utilities export-ignore
+/.github export-ignore
 
 /.gitattributes export-ignore
 /.gitignore export-ignore

.github/workflows/ci.yml

@@ -28,6 +28,7 @@ jobs:
           - "7.3"
           - "7.4"
           - "8.0"
+          - "8.1"
 
         compiler:
           - default
@@ -36,6 +37,9 @@ jobs:
           - os: ubuntu-latest
             php-version: "8.0"
             compiler: jit
+          - os: ubuntu-latest
+            php-version: "8.1"
+            compiler: jit
 
     steps:
     - name: Checkout

CHANGELOG.md

@@ -6,6 +6,29 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [4.1.1] - 2022-05-17
+
+### Security
+- Prevent PHP injection through malicious block name or include file name. This addresses CVE-2022-
+
+### Fixed
+- Exclude docs and demo from export and composer [#751](https://github.com/smarty-php/smarty/pull/751)
+- PHP 8.1 deprecation notices in demo/plugins/cacheresource.pdo.php [#706](https://github.com/smarty-php/smarty/issues/706)
+- PHP 8.1 deprecation notices in truncate modifier [#699](https://github.com/smarty-php/smarty/issues/699)
+- Math equation `max(x, y)` didn't work anymore [#721](https://github.com/smarty-php/smarty/issues/721)
+- Fix PHP 8.1 deprecated warning when calling rtrim [#743](https://github.com/smarty-php/smarty/pull/743)
+- PHP 8.1: fix deprecation in escape modifier [#727](https://github.com/smarty-php/smarty/pull/727)
+
+## [4.1.0] - 2022-02-06
+
+### Added
+- PHP8.1 compatibility [#713](https://github.com/smarty-php/smarty/pull/713)
+
+## [4.0.4] - 2022-01-18
+
+### Fixed
+- Fixed illegal characters bug in math function security check [#702](https://github.com/smarty-php/smarty/issues/702)
+
 ## [4.0.3] - 2022-01-10
 
 ### Security

README.md

@@ -7,7 +7,7 @@ Smarty is a template engine for PHP, facilitating the separation of presentation
 Read the [documentation](https://smarty-php.github.io/smarty/) to find out how to use it. 
 
 ## Requirements
-Smarty can be run with PHP 7.1 to PHP 8.0.
+Smarty can be run with PHP 7.1 to PHP 8.1.
 
 ## Installation
 Smarty versions 3.1.11 or later can be installed with [Composer](https://getcomposer.org/).

demo/plugins/cacheresource.pdo.php

@@ -196,7 +196,7 @@ class Smarty_CacheResource_Pdo extends Smarty_CacheResource_Custom
      * @return void
      * @access protected
      */
-    protected function fetch($id, $name, $cache_id = null, $compile_id = null, &$content, &$mtime)
+    protected function fetch($id, $name, $cache_id, $compile_id, &$content, &$mtime)
     {
         $stmt = $this->getFetchStatement($this->fetchColumns, $id, $cache_id, $compile_id);
         $stmt->execute();
@@ -244,7 +244,7 @@ class Smarty_CacheResource_Pdo extends Smarty_CacheResource_Custom
      * @return boolean success
      * @access protected
      */
-    protected function save($id, $name, $cache_id = null, $compile_id = null, $exp_time, $content)
+    protected function save($id, $name, $cache_id, $compile_id, $exp_time, $content)
     {
         $stmt = $this->pdo->prepare($this->insertStatement);
         $stmt->bindValue('id', $id);

docs/getting-started.md

@@ -2,7 +2,7 @@ What is Smarty?
 ==============
 
 ## Requirements
-Smarty can be run with PHP 7.1 to PHP 8.0.
+Smarty can be run with PHP 7.1 to PHP 8.1.
 
 ## Installation
 Smarty versions 3.1.11 or later can be installed with [Composer](https://getcomposer.org/).

libs/Smarty.class.php

@@ -98,7 +98,7 @@ class Smarty extends Smarty_Internal_TemplateBase
     /**
      * smarty version
      */
-    const SMARTY_VERSION = '4.0.3';
+    const SMARTY_VERSION = '4.1.1';
     /**
      * define variable scopes
      */
@@ -867,7 +867,7 @@ class Smarty extends Smarty_Internal_TemplateBase
                 $this->plugins_dir = (array)$this->plugins_dir;
             }
             foreach ($this->plugins_dir as $k => $v) {
-                $this->plugins_dir[ $k ] = $this->_realpath(rtrim($v, '/\\') . DIRECTORY_SEPARATOR, true);
+                $this->plugins_dir[ $k ] = $this->_realpath(rtrim($v ?? '', '/\\') . DIRECTORY_SEPARATOR, true);
             }
             $this->_cache[ 'plugin_files' ] = array();
             $this->_pluginsDirNormalized = true;
@@ -1345,7 +1345,7 @@ class Smarty extends Smarty_Internal_TemplateBase
      */
     private function _normalizeDir($dirName, $dir)
     {
-        $this->{$dirName} = $this->_realpath(rtrim($dir, "/\\") . DIRECTORY_SEPARATOR, true);
+        $this->{$dirName} = $this->_realpath(rtrim($dir ?? '', "/\\") . DIRECTORY_SEPARATOR, true);
     }
 
     /**
@@ -1367,7 +1367,7 @@ class Smarty extends Smarty_Internal_TemplateBase
         }
         foreach ($dir as $k => $v) {
             if (!isset($processed[ $k ])) {
-                $dir[ $k ] = $v = $this->_realpath(rtrim($v, "/\\") . DIRECTORY_SEPARATOR, true);
+                $dir[ $k ] = $v = $this->_realpath(rtrim($v ?? '', "/\\") . DIRECTORY_SEPARATOR, true);
                 $processed[ $k ] = true;
             }
         }

libs/plugins/function.math.php

@@ -69,8 +69,8 @@ function smarty_function_math($params, $template)
     // Adapted from https://www.php.net/manual/en/function.eval.php#107377
     $number = '(?:\d+(?:[,.]\d+)?|pi|π)'; // What is a number
     $functionsOrVars = '((?:0x[a-fA-F0-9]+)|([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*))';
-    $operators = '[+\/*\^%-]'; // Allowed math operators
-    $regexp = '/^(('.$number.'|'.$functionsOrVars.'|('.$functionsOrVars.'\s*\((?1)+\)|\((?1)+\)))(?:'.$operators.'(?2))?)+$/';
+    $operators = '[,+\/*\^%-]'; // Allowed math operators
+    $regexp = '/^(('.$number.'|'.$functionsOrVars.'|('.$functionsOrVars.'\s*\((?1)+\)|\((?1)+\)))(?:'.$operators.'(?1))?)+$/';
 
     if (!preg_match($regexp, $equation)) {
         trigger_error("math: illegal characters", E_USER_WARNING);

libs/plugins/modifier.escape.php

@@ -29,6 +29,9 @@ function smarty_modifier_escape($string, $esc_type = 'html', $char_set = null, $
     if (!$char_set) {
         $char_set = Smarty::$_CHARSET;
     }
+
+    $string = (string)$string;
+
     switch ($esc_type) {
         case 'html':
             if ($_double_encode) {

libs/plugins/modifier.truncate.php

@@ -42,8 +42,8 @@ function smarty_modifier_truncate($string, $length = 80, $etc = '...', $break_wo
             if (!$middle) {
                 return mb_substr($string, 0, $length, Smarty::$_CHARSET) . $etc;
             }
-            return mb_substr($string, 0, $length / 2, Smarty::$_CHARSET) . $etc .
-                   mb_substr($string, -$length / 2, $length, Smarty::$_CHARSET);
+            return mb_substr($string, 0, intval($length / 2), Smarty::$_CHARSET) . $etc .
+                   mb_substr($string, -intval($length / 2), $length, Smarty::$_CHARSET);
         }
         return $string;
     }
@@ -56,7 +56,7 @@ function smarty_modifier_truncate($string, $length = 80, $etc = '...', $break_wo
         if (!$middle) {
             return substr($string, 0, $length) . $etc;
         }
-        return substr($string, 0, $length / 2) . $etc . substr($string, -$length / 2);
+        return substr($string, 0, intval($length / 2)) . $etc . substr($string, -intval($length / 2));
     }
     return $string;
 }

libs/plugins/modifiercompiler.escape.php

@@ -42,10 +42,10 @@ function smarty_modifiercompiler_escape($params, Smarty_Internal_TemplateCompile
         switch ($esc_type) {
             case 'html':
                 if ($_double_encode) {
-                    return 'htmlspecialchars(' . $params[ 0 ] . ', ENT_QUOTES, ' . var_export($char_set, true) . ', ' .
+                    return 'htmlspecialchars((string)' . $params[ 0 ] . ', ENT_QUOTES, ' . var_export($char_set, true) . ', ' .
                            var_export($double_encode, true) . ')';
                 } elseif ($double_encode) {
-                    return 'htmlspecialchars(' . $params[ 0 ] . ', ENT_QUOTES, ' . var_export($char_set, true) . ')';
+                    return 'htmlspecialchars((string)' . $params[ 0 ] . ', ENT_QUOTES, ' . var_export($char_set, true) . ')';
                 } else {
                     // fall back to modifier.escape.php
                 }
@@ -54,12 +54,12 @@ function smarty_modifiercompiler_escape($params, Smarty_Internal_TemplateCompile
                 if (Smarty::$_MBSTRING) {
                     if ($_double_encode) {
                         // php >=5.2.3 - go native
-                        return 'mb_convert_encoding(htmlspecialchars(' . $params[ 0 ] . ', ENT_QUOTES, ' .
+                        return 'mb_convert_encoding(htmlspecialchars((string)' . $params[ 0 ] . ', ENT_QUOTES, ' .
                                var_export($char_set, true) . ', ' . var_export($double_encode, true) .
                                '), "HTML-ENTITIES", ' . var_export($char_set, true) . ')';
                     } elseif ($double_encode) {
                         // php <5.2.3 - only handle double encoding
-                        return 'mb_convert_encoding(htmlspecialchars(' . $params[ 0 ] . ', ENT_QUOTES, ' .
+                        return 'mb_convert_encoding(htmlspecialchars((string)' . $params[ 0 ] . ', ENT_QUOTES, ' .
                                var_export($char_set, true) . '), "HTML-ENTITIES", ' . var_export($char_set, true) . ')';
                     } else {
                         // fall back to modifier.escape.php
@@ -68,26 +68,26 @@ function smarty_modifiercompiler_escape($params, Smarty_Internal_TemplateCompile
                 // no MBString fallback
                 if ($_double_encode) {
                     // php >=5.2.3 - go native
-                    return 'htmlentities(' . $params[ 0 ] . ', ENT_QUOTES, ' . var_export($char_set, true) . ', ' .
+                    return 'htmlentities((string)' . $params[ 0 ] . ', ENT_QUOTES, ' . var_export($char_set, true) . ', ' .
                            var_export($double_encode, true) . ')';
                 } elseif ($double_encode) {
                     // php <5.2.3 - only handle double encoding
-                    return 'htmlentities(' . $params[ 0 ] . ', ENT_QUOTES, ' . var_export($char_set, true) . ')';
+                    return 'htmlentities((string)' . $params[ 0 ] . ', ENT_QUOTES, ' . var_export($char_set, true) . ')';
                 } else {
                     // fall back to modifier.escape.php
                 }
             // no break
             case 'url':
-                return 'rawurlencode(' . $params[ 0 ] . ')';
+                return 'rawurlencode((string)' . $params[ 0 ] . ')';
             case 'urlpathinfo':
-                return 'str_replace("%2F", "/", rawurlencode(' . $params[ 0 ] . '))';
+                return 'str_replace("%2F", "/", rawurlencode((string)' . $params[ 0 ] . '))';
             case 'quotes':
                 // escape unescaped single quotes
-                return 'preg_replace("%(?<!\\\\\\\\)\'%", "\\\'",' . $params[ 0 ] . ')';
+                return 'preg_replace("%(?<!\\\\\\\\)\'%", "\\\'", (string)' . $params[ 0 ] . ')';
             case 'javascript':
                 // escape quotes and backslashes, newlines, etc.
                 // see https://html.spec.whatwg.org/multipage/scripting.html#restrictions-for-contents-of-script-elements
-                return 'strtr(' .
+                return 'strtr((string)' .
                        $params[ 0 ] .
                        ', array("\\\\" => "\\\\\\\\", "\'" => "\\\\\'", "\"" => "\\\\\"", "\\r" => "\\\\r", "\\n" => "\\\n", "</" => "<\/", "<!--" => "<\!--", "<s" => "<\s", "<S" => "<\S" ))';
         }

libs/sysplugins/smarty_internal_cacheresource_file.php

@@ -196,8 +196,8 @@ class Smarty_Internal_CacheResource_File extends Smarty_CacheResource
      */
     public function hasLock(Smarty $smarty, Smarty_Template_Cached $cached)
     {
-        clearstatcache(true, $cached->lock_id);
-        if (is_file($cached->lock_id)) {
+        clearstatcache(true, $cached->lock_id ?? '');
+        if (null !== $cached->lock_id && is_file($cached->lock_id)) {
             $t = filemtime($cached->lock_id);
             return $t && (time() - $t < $smarty->locking_timeout);
         } else {

libs/sysplugins/smarty_internal_compile_block.php

@@ -125,7 +125,7 @@ class Smarty_Internal_Compile_Blockclose extends Smarty_Internal_Compile_Shared_
         // setup buffer for template function code
         $compiler->parser->current_buffer = new Smarty_Internal_ParseTree_Template();
         $output = "<?php\n";
-        $output .= "/* {block {$_name}} */\n";
+        $output .= $compiler->cStyleComment(" {block {$_name}} ") . "\n";
         $output .= "class {$_className} extends Smarty_Internal_Block\n";
         $output .= "{\n";
         foreach ($_block as $property => $value) {
@@ -155,7 +155,7 @@ class Smarty_Internal_Compile_Blockclose extends Smarty_Internal_Compile_Shared_
         }
         $output .= "}\n";
         $output .= "}\n";
-        $output .= "/* {/block {$_name}} */\n\n";
+        $output .= $compiler->cStyleComment(" {/block {$_name}} ") . "\n\n";
         $output .= "?>\n";
         $compiler->parser->current_buffer->append_subtree(
             $compiler->parser,

libs/sysplugins/smarty_internal_compile_function.php

@@ -134,7 +134,7 @@ class Smarty_Internal_Compile_Functionclose extends Smarty_Internal_CompileBase
         if ($compiler->template->compiled->has_nocache_code) {
             $compiler->parent_compiler->tpl_function[ $_name ][ 'call_name_caching' ] = $_funcNameCaching;
             $output = "<?php\n";
-            $output .= "/* {$_funcNameCaching} */\n";
+            $output .= $compiler->cStyleComment(" {$_funcNameCaching} ") . "\n";
             $output .= "if (!function_exists('{$_funcNameCaching}')) {\n";
             $output .= "function {$_funcNameCaching} (Smarty_Internal_Template \$_smarty_tpl,\$params) {\n";
             $output .= "ob_start();\n";
@@ -157,9 +157,9 @@ class Smarty_Internal_Compile_Functionclose extends Smarty_Internal_CompileBase
             $output = "<?php echo \"/*%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%*/<?php ";
             $output .= "\\\$_smarty_tpl->smarty->ext->_tplFunction->restoreTemplateVariables(\\\$_smarty_tpl, '{$_name}');?>\n";
             $output .= "/*/%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%*/\";\n?>";
-            $output .= "<?php echo str_replace('{$compiler->template->compiled->nocache_hash}', \$_smarty_tpl->compiled->nocache_hash, ob_get_clean());\n";
+            $output .= "<?php echo str_replace('{$compiler->template->compiled->nocache_hash}', \$_smarty_tpl->compiled->nocache_hash ?? '', ob_get_clean());\n";
             $output .= "}\n}\n";
-            $output .= "/*/ {$_funcName}_nocache */\n\n";
+            $output .= $compiler->cStyleComment("/ {$_funcName}_nocache ") . "\n\n";
             $output .= "?>\n";
             $compiler->parser->current_buffer->append_subtree(
                 $compiler->parser,
@@ -179,7 +179,7 @@ class Smarty_Internal_Compile_Functionclose extends Smarty_Internal_CompileBase
         }
         $compiler->parent_compiler->tpl_function[ $_name ][ 'call_name' ] = $_funcName;
         $output = "<?php\n";
-        $output .= "/* {$_funcName} */\n";
+        $output .= $compiler->cStyleComment(" {$_funcName} ") . "\n";
         $output .= "if (!function_exists('{$_funcName}')) {\n";
         $output .= "function {$_funcName}(Smarty_Internal_Template \$_smarty_tpl,\$params) {\n";
         $output .= $_paramsCode;
@@ -196,7 +196,7 @@ class Smarty_Internal_Compile_Functionclose extends Smarty_Internal_CompileBase
         );
         $compiler->parser->current_buffer->append_subtree($compiler->parser, $_functionCode);
         $output = "<?php\n}}\n";
-        $output .= "/*/ {$_funcName} */\n\n";
+        $output .= $compiler->cStyleComment("/ {$_funcName} ") . "\n\n";
         $output .= "?>\n";
         $compiler->parser->current_buffer->append_subtree(
             $compiler->parser,

libs/sysplugins/smarty_internal_compile_include.php

@@ -318,14 +318,14 @@ class Smarty_Internal_Compile_Include extends Smarty_Internal_CompileBase
             }
             // get compiled code
             $compiled_code = "<?php\n\n";
-            $compiled_code .= "/* Start inline template \"{$sourceInfo}\" =============================*/\n";
+            $compiled_code .= $compiler->cStyleComment(" Start inline template \"{$sourceInfo}\" =============================") . "\n";
             $compiled_code .= "function {$tpl->compiled->unifunc} (Smarty_Internal_Template \$_smarty_tpl) {\n";
             $compiled_code .= "?>\n" . $tpl->compiler->compileTemplateSource($tpl, null, $compiler->parent_compiler);
             $compiled_code .= "<?php\n";
             $compiled_code .= "}\n?>\n";
             $compiled_code .= $tpl->compiler->postFilter($tpl->compiler->blockOrFunctionCode);
             $compiled_code .= "<?php\n\n";
-            $compiled_code .= "/* End inline template \"{$sourceInfo}\" =============================*/\n";
+            $compiled_code .= $compiler->cStyleComment(" End inline template \"{$sourceInfo}\" =============================") . "\n";
             $compiled_code .= '?>';
             unset($tpl->compiler);
             if ($tpl->compiled->has_nocache_code) {

libs/sysplugins/smarty_internal_compile_insert.php

@@ -93,7 +93,7 @@ class Smarty_Internal_Compile_Insert extends Smarty_Internal_CompileBase
                 }
                 if (!empty($_dir)) {
                     foreach ((array)$_dir as $_script_dir) {
-                        $_script_dir = rtrim($_script_dir, '/\\') . DIRECTORY_SEPARATOR;
+                        $_script_dir = rtrim($_script_dir ?? '', '/\\') . DIRECTORY_SEPARATOR;
                         if (file_exists($_script_dir . $_script)) {
                             $_filepath = $_script_dir . $_script;
                             break;

libs/sysplugins/smarty_internal_config_file_compiler.php

@@ -157,10 +157,12 @@ class Smarty_Internal_Config_File_Compiler
             $this->smarty->_debug->end_compile($this->template);
         }
         // template header code
-        $template_header =
-            "<?php /* Smarty version " . Smarty::SMARTY_VERSION . ", created on " . strftime("%Y-%m-%d %H:%M:%S") .
-            "\n";
-        $template_header .= "         compiled from '{$this->template->source->filepath}' */ ?>\n";
+        $template_header = sprintf(
+            "<?php /* Smarty version %s, created on %s\n         compiled from '%s' */ ?>\n",
+            Smarty::SMARTY_VERSION,
+            date("Y-m-d H:i:s"),
+            str_replace('*/', '* /' , $this->template->source->filepath)
+        );
         $code = '<?php $_smarty_tpl->smarty->ext->configLoad->_loadConfigVars($_smarty_tpl, ' .
                 var_export($this->config_data, true) . '); ?>';
         return $template_header . $this->template->smarty->ext->_codeFrame->create($this->template, $code);

libs/sysplugins/smarty_internal_runtime_codeframe.php

@@ -44,9 +44,12 @@ class Smarty_Internal_Runtime_CodeFrame
             $properties[ 'file_dependency' ] = $_template->cached->file_dependency;
             $properties[ 'cache_lifetime' ] = $_template->cache_lifetime;
         }
-        $output = "<?php\n";
-        $output .= "/* Smarty version {$properties[ 'version' ]}, created on " . strftime("%Y-%m-%d %H:%M:%S") .
-                   "\n  from '" . str_replace('*/', '* /', $_template->source->filepath) . "' */\n\n";
+        $output = sprintf(
+			"<?php\n/* Smarty version %s, created on %s\n  from '%s' */\n\n",
+            $properties[ 'version' ],
+	        date("Y-m-d H:i:s"),
+	        str_replace('*/', '* /', $_template->source->filepath)
+        );
         $output .= "/* @var Smarty_Internal_Template \$_smarty_tpl */\n";
         $dec = "\$_smarty_tpl->_decodeProperties(\$_smarty_tpl, " . var_export($properties, true) . ',' .
                ($cache ? 'true' : 'false') . ')';

libs/sysplugins/smarty_internal_templatecompilerbase.php

@@ -1135,7 +1135,7 @@ abstract class Smarty_Internal_TemplateCompilerBase
             flush();
         }
         $e = new SmartyCompilerException($error_text);
-        $e->line = $line;
+        $e->setLine($line);
         $e->source = trim(preg_replace('![\t\r\n]+!', ' ', $match[ $line - 1 ]));
         $e->desc = $args;
         $e->template = $this->template->source->filepath;
@@ -1439,6 +1439,10 @@ abstract class Smarty_Internal_TemplateCompilerBase
      */
     abstract protected function doCompile($_content, $isTemplateSource = false);
 
+    public function cStyleComment($string) {
+        return '/*' . str_replace('*/', '* /' , $string) . '*/';
+    }
+
     /**
      * Compile Tag
      *

libs/sysplugins/smartycompilerexception.php

@@ -16,12 +16,12 @@ class SmartyCompilerException extends SmartyException
     }
 
     /**
-     * The line number of the template error
-     *
-     * @type int|null
+     * @param int $line
      */
-    public $line = null;
-
+    public function setLine($line)
+    {
+        $this->line = $line;
+    }
     /**
      * The template source snippet relating to the error
      *

tests/UnitTests/CacheResourceTests/_shared/CacheResourceTestCommon.php

@@ -30,7 +30,8 @@ class CacheResourceTestCommon extends PHPUnit_Smarty
 
     public function compiledPrefilter($text, Smarty_Internal_Template $tpl)
     {
-        return str_replace('#', $tpl->getTemplateVars('test'), $text);
+        $replace = $tpl->getTemplateVars('test');
+        return str_replace('#', $replace ?? '', $text);
     }
 
     /**

tests/UnitTests/ResourceTests/Custom/Ambiguous/PHPunitplugins/resource.ambiguous.php

@@ -13,7 +13,7 @@ class Smarty_Resource_Ambiguous extends Smarty_Internal_Resource_File
 
     public function __construct($directory)
     {
-        $this->directory = rtrim($directory, "/\\") . DIRECTORY_SEPARATOR;
+        $this->directory = rtrim($directory ?? '', "/\\") . DIRECTORY_SEPARATOR;
         //        parent::__construct();
     }
 

tests/UnitTests/ResourceTests/Stream/StreamResourceTest.php

@@ -234,7 +234,7 @@ class ResourceStream
         $v = &$GLOBALS[$this->varname];
         $l = strlen($data);
         $p = &$this->position;
-        $v = substr($v, 0, $p) . $data . substr($v, $p += $l);
+        $v = substr($v ?? '', 0, $p) . $data . substr($v ?? '', $p += $l);
 
         return $l;
     }

tests/UnitTests/SecurityTests/SecurityTest.php

@@ -366,9 +366,9 @@ class SecurityTest extends PHPUnit_Smarty
 
     /**
      * In security mode, accessing $smarty.template_object should be illegal.
-     * @expectedException SmartyCompilerException
      */
     public function testSmartyTemplateObject() {
+        $this->expectException(SmartyCompilerException::class);
         $this->smarty->display('string:{$smarty.template_object}');
     }
 
@@ -416,7 +416,7 @@ class ResourceStreamSecurity
         $v = &$GLOBALS[$this->varname];
         $l = strlen($data);
         $p = &$this->position;
-        $v = substr($v, 0, $p) . $data . substr($v, $p += $l);
+        $v = substr($v ?? '', 0, $p) . $data . substr($v ?? '', $p += $l);
 
         return $l;
     }

tests/UnitTests/TemplateSource/TagTests/TemplateFunction/CompileFunctionTest.php

@@ -435,9 +435,9 @@ class CompileFunctionTest extends PHPUnit_Smarty
 
     /**
      * Test handling of function names that are a security risk
-     * @expectedException        SmartyCompilerException
      */
     public function testIllegalFunctionName() {
+        $this->expectException(SmartyCompilerException::class);
 	    $this->smarty->fetch('string:{function name=\'rce(){};echo "hi";function \'}{/function}');
     }
 

tests/UnitTests/TemplateSource/ValueTests/Math/MathTest.php

@@ -44,6 +44,30 @@ class MathTest extends PHPUnit_Smarty
         $this->assertEquals($expected, $this->smarty->fetch($tpl));
     }
 
+    public function testMultipleOperators()
+    {
+        $this->smarty->disableSecurity();
+        $expected = "2 -- 2";
+        $tpl = $this->smarty->createTemplate('eval:{$x = 5}{$y = 4}{math equation="x - y + 1" x=$x y=$y} -- {math equation="5 - 4 + 1"}');
+        $this->assertEquals($expected, $this->smarty->fetch($tpl));
+    }
+
+    public function testMathMaxFunctionParameters()
+    {
+        $this->smarty->disableSecurity();
+        $expected = max(0, 2) . ' -- ' . max(0, 2, 3);
+        $tpl = $this->smarty->createTemplate('eval:{$x = 0}{$y = 2}{$z = 3}{math equation="max(x, y)" x=$x y=$y} -- {math equation="max(x, y, z)" x=$x y=$y z=$z}');
+        $this->assertEquals($expected, $this->smarty->fetch($tpl));
+    }
+
+    public function testMathMinFunctionParameters()
+    {
+        $this->smarty->disableSecurity();
+        $expected = min(1, 2) . ' -- ' . min(1, 2, 0);
+        $tpl = $this->smarty->createTemplate('eval:{$x = 1}{$y = 2}{$z = 0}{math equation="min(x, y)" x=$x y=$y} -- {math equation="min(x, y, z)" x=$x y=$y z=$z}');
+        $this->assertEquals($expected, $this->smarty->fetch($tpl));
+    }
+
     public function testSyntaxSin()
     {
         $this->smarty->disableSecurity();

tests/UnitTests/TemplateSource/ValueTests/Variables/Stream/StreamVariableTest.php

@@ -96,7 +96,7 @@ class VariableStream
         $v = &$GLOBALS[$this->varname];
         $l = strlen($data);
         $p = &$this->position;
-        $v = substr($v, 0, $p) . $data . substr($v, $p += $l);
+        $v = substr($v ?? '', 0, $p) . $data . substr($v ?? '', $p += $l);
 
         return $l;
     }