Add :string method signature to compile method everywhere.

src/Compile/Base.php

@@ -229,5 +229,5 @@ abstract class Base implements CompilerInterface {
 	 * @return string compiled code as a string
 	 * @throws \Smarty\CompilerException
 	 */
-	abstract public function compile($args, Template $compiler, $parameter = array(), $tag = null, $function = null);
+	abstract public function compile($args, Template $compiler, $parameter = array(), $tag = null, $function = null): string;
 }

src/Compile/BlockCompiler.php

@@ -50,7 +50,8 @@ class BlockCompiler extends Base {
 	 * @throws CompilerException
 	 * @throws Exception
 	 */
-	public function compile($args, Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 
 		if (!isset($tag[5]) || substr($tag, -5) !== 'close') {
 			$output = $this->compileOpeningTag($compiler, $args, $tag, $function);

src/Compile/CompilerInterface.php

@@ -20,7 +20,7 @@ interface CompilerInterface {
 	 * @return string compiled code as a string
 	 * @throws \Smarty\CompilerException
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null);
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string;
 
 	public function isCacheable(): bool;
 }

src/Compile/DefaultHandlerFunctionCallCompiler.php

@@ -27,7 +27,8 @@ class DefaultHandlerFunctionCallCompiler extends Base {
 	 * @throws \Smarty\CompilerException
 	 * @throws \Smarty\Exception
 	 */
-	public function compile($args, Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		// check and get attributes
 		$_attr = $this->getAttributes($compiler, $args);
 		unset($_attr['nocache']);

src/Compile/FunctionCallCompiler.php

@@ -49,7 +49,8 @@ class FunctionCallCompiler extends Base {
 	 * @throws \Smarty\CompilerException
 	 * @throws \Smarty\Exception
 	 */
-	public function compile($args, Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 
 		// check and get attributes
 		$_attr = $this->getAttributes($compiler, $args);

src/Compile/ModifierCompiler.php

@@ -33,7 +33,8 @@ class ModifierCompiler extends Base {
 	 * @throws \Smarty\CompilerException
 	 * @throws \Smarty\Exception
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 
 		$output = $parameter['value'];
 

src/Compile/ObjectMethodCallCompiler.php

@@ -39,7 +39,8 @@ class ObjectMethodCallCompiler extends Base {
 	 * @throws \Smarty\CompilerException
 	 * @throws \Smarty\Exception
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		// check and get attributes
 		$_attr = $this->getAttributes($compiler, $args);
 		unset($_attr['nocache']);

src/Compile/PrintExpressionCompiler.php

@@ -47,7 +47,8 @@ class PrintExpressionCompiler extends Base {
 	 * @return string
 	 * @throws \Smarty\Exception
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 
 		// check and get attributes
 		$_attr = $this->getAttributes($compiler, $args);

src/Compile/SpecialVariableCompiler.php

@@ -37,7 +37,8 @@ class SpecialVariableCompiler extends Base {
 	 * @return string compiled code
 	 * @throws CompilerException
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 
 		$_index = preg_split("/\]\[/", substr($parameter, 1, strlen($parameter) - 2));
 		$variable = smarty_strtolower_ascii($compiler->getId($_index[0]));
@@ -127,5 +128,7 @@ class SpecialVariableCompiler extends Base {
 			}
 			return $compiled_ref;
 		}
+
+		return '';
 	}
 }

src/Compile/Tag/Append.php

@@ -35,8 +35,8 @@ class Append extends Assign
      * @return string compiled code
      * @throws \Smarty\CompilerException
      */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = array(), $tag = null, $function = null)
-    {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = array(), $tag = null, $function = null): string
+	{
 
         // check and get attributes
         $_attr = $this->getAttributes($compiler, $args);

src/Compile/Tag/Assign.php

@@ -55,8 +55,8 @@ class Assign extends Base
      * @return string compiled code
      * @throws \Smarty\CompilerException
      */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = array(), $tag = null, $function = null)
-    {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = array(), $tag = null, $function = null): string
+	{
 
         $_nocache = false;
         // check and get attributes

src/Compile/Tag/BCPluginWrapper.php

@@ -24,7 +24,8 @@ class BCPluginWrapper extends Base {
 	/**
 	 * @inheritDoc
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		return call_user_func($this->callback, $this->getAttributes($compiler, $args), $compiler->getSmarty());
 	}
 }

src/Compile/Tag/Block.php

@@ -58,7 +58,7 @@ class Block extends Inheritance {
 	 * @param \Smarty\Compiler\Template $compiler compiler object
 	 * @param array $parameter array with compilation parameter
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = array(), $tag = null, $function = null)
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = array(), $tag = null, $function = null): string
 	{
 		if (!isset($compiler->_cache['blockNesting'])) {
 			$compiler->_cache['blockNesting'] = 0;

src/Compile/Tag/BlockClose.php

@@ -18,7 +18,7 @@ class BlockClose extends Inheritance {
 	 *
 	 * @return bool true
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = array(), $tag = null, $function = null)
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = array(), $tag = null, $function = null): string
 	{
 		[$_attr, $_nocache, $_buffer, $_has_nocache_code, $_className] = $this->closeTag($compiler, ['block']);
 

src/Compile/Tag/BreakTag.php

@@ -52,7 +52,7 @@ class BreakTag extends Base {
 	 * @return string compiled code
 	 * @throws \Smarty\CompilerException
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = array(), $tag = null, $function = null)
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = array(), $tag = null, $function = null): string
 	{
 		[$levels, $foreachLevels] = $this->checkLevels($args, $compiler);
 		$output = "<?php ";

src/Compile/Tag/Call.php

@@ -47,7 +47,8 @@ class Call extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		// check and get attributes
 		$_attr = $this->getAttributes($compiler, $args);
 		// save possible attributes

src/Compile/Tag/Capture.php

@@ -53,7 +53,8 @@ class Capture extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		// check and get attributes
 		$_attr = $this->getAttributes($compiler, $args);
 		$buffer = $_attr['name'] ?? "'default'";

src/Compile/Tag/CaptureClose.php

@@ -29,7 +29,8 @@ class CaptureClose extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 
 		if (array_pop($compiler->_cache['capture_stack'])) {
 			// pop the virtual {nocache} tag from the stack.

src/Compile/Tag/ConfigLoad.php

@@ -62,7 +62,8 @@ class ConfigLoad extends Base {
 	 * @return string compiled code
 	 * @throws \Smarty\CompilerException
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		// check and get attributes
 		$_attr = $this->getAttributes($compiler, $args);
 		if ($_attr['nocache'] === true) {

src/Compile/Tag/Debug.php

@@ -29,7 +29,8 @@ class Debug extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		// check and get attributes, may trigger errors
 		$this->getAttributes($compiler, $args);
 

src/Compile/Tag/ElseIfTag.php

@@ -22,7 +22,8 @@ class ElseIfTag extends Base {
 	 * @return string compiled code
 	 * @throws \Smarty\CompilerException
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 
 		[$nesting, $nocache_pushed] = $this->closeTag($compiler, ['if', 'elseif']);
 

src/Compile/Tag/ElseTag.php

@@ -20,7 +20,8 @@ class ElseTag extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		[$nesting, $compiler->tag_nocache] = $this->closeTag($compiler, ['if', 'elseif']);
 		$this->openTag($compiler, 'else', [$nesting, $compiler->tag_nocache]);
 		return '<?php } else { ?>';

src/Compile/Tag/EvalTag.php

@@ -52,7 +52,8 @@ class EvalTag extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		// check and get attributes
 		$_attr = $this->getAttributes($compiler, $args);
 		if (isset($_attr['assign'])) {

src/Compile/Tag/ExtendsTag.php

@@ -52,7 +52,8 @@ class ExtendsTag extends Inheritance {
 	 * @throws \Smarty\CompilerException
 	 * @throws \Smarty\Exception
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		// check and get attributes
 		$_attr = $this->getAttributes($compiler, $args);
 		if ($_attr['nocache'] === true) {

src/Compile/Tag/ForClose.php

@@ -29,7 +29,8 @@ class ForClose extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$compiler->loopNesting--;
 
 		[$openTag, $nocache_pushed] = $this->closeTag($compiler, ['for', 'forelse']);

src/Compile/Tag/ForElse.php

@@ -21,7 +21,8 @@ class ForElse extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		[$tagName, $nocache_pushed] = $this->closeTag($compiler, ['for']);
 		$this->openTag($compiler, 'forelse', ['forelse', $nocache_pushed]);
 		return "<?php }} else { ?>";

src/Compile/Tag/ForTag.php

@@ -28,7 +28,8 @@ class ForTag extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$compiler->loopNesting++;
 		if ($parameter === 0) {
 			$this->required_attributes = ['start', 'to'];

src/Compile/Tag/ForeachClose.php

@@ -29,7 +29,8 @@ class ForeachClose extends Base {
 	 * @return string compiled code
 	 * @throws \Smarty\CompilerException
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$compiler->loopNesting--;
 
 		[$openTag, $nocache_pushed, $localVariablePrefix, $item, $restore] = $this->closeTag($compiler, ['foreach', 'foreachelse']);

src/Compile/Tag/ForeachElse.php

@@ -20,7 +20,8 @@ class ForeachElse extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 
 		[$openTag, $nocache_pushed, $localVariablePrefix, $item, $restore] = $this->closeTag($compiler, ['foreach']);
 		$this->openTag($compiler, 'foreachelse', ['foreachelse', $nocache_pushed, $localVariablePrefix, $item, false]);

src/Compile/Tag/ForeachTag.php

@@ -79,7 +79,8 @@ class ForeachTag extends ForeachSection {
 	 * @throws \Smarty\CompilerException
 	 * @throws \Smarty\Exception
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$compiler->loopNesting++;
 		// init
 		$this->isNamed = false;

src/Compile/Tag/FunctionClose.php

@@ -33,9 +33,10 @@ class FunctionClose extends Base {
 	 * @param array $args array with attributes from parser
 	 * @param object|\Smarty\Compiler\Template $compiler compiler object
 	 *
-	 * @return bool true
+	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$this->compiler = $compiler;
 		$saved_data = $this->closeTag($compiler, ['function']);
 		$_attr = $saved_data[0];

src/Compile/Tag/FunctionTag.php

@@ -42,10 +42,11 @@ class FunctionTag extends Base {
 	 * @param array $args array with attributes from parser
 	 * @param \Smarty\Compiler\Template $compiler compiler object
 	 *
-	 * @return bool true
+	 * @return string compiled code
 	 * @throws \Smarty\CompilerException
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		// check and get attributes
 		$_attr = $this->getAttributes($compiler, $args);
 		if ($_attr['nocache'] === true) {

src/Compile/Tag/IfClose.php

@@ -28,7 +28,8 @@ class IfClose extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 
 		[$nesting, $nocache_pushed] = $this->closeTag($compiler, ['if', 'else', 'elseif']);
 

src/Compile/Tag/IfTag.php

@@ -22,7 +22,8 @@ class IfTag extends Base {
 	 * @return string compiled code
 	 * @throws \Smarty\CompilerException
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 
 		if ($compiler->tag_nocache) {
 			// push a {nocache} tag onto the stack to prevent caching of this block

src/Compile/Tag/IncludeTag.php

@@ -67,7 +67,8 @@ class IncludeTag extends Base {
 	 * @throws \Smarty\CompilerException
 	 * @throws \Smarty\Exception
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$uid = $t_hash = null;
 		// check and get attributes
 		$_attr = $this->getAttributes($compiler, $args);

src/Compile/Tag/Ldelim.php

@@ -30,7 +30,8 @@ class Ldelim extends Base {
 	 * @return string compiled code
 	 * @throws \Smarty\CompilerException
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$_attr = $this->getAttributes($compiler, $args);
 		if ($_attr['nocache'] === true) {
 			$compiler->trigger_template_error('nocache option not allowed', null, true);

src/Compile/Tag/Nocache.php

@@ -26,9 +26,10 @@ class Nocache extends Base {
 	 * @param array $args array with attributes from parser
 	 * @param \Smarty\Compiler\Template $compiler compiler object
 	 *
-	 * @return bool
+	 * @return string
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$this->openTag($compiler, 'nocache');
 		return '';
 	}

src/Compile/Tag/NocacheClose.php

@@ -27,9 +27,10 @@ class NocacheClose extends Base {
 	 * @param array $args array with attributes from parser
 	 * @param \Smarty\Compiler\Template $compiler compiler object
 	 *
-	 * @return bool
+	 * @return string
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$this->closeTag($compiler, ['nocache']);
 		return '';
 	}

src/Compile/Tag/Rdelim.php

@@ -28,7 +28,8 @@ class Rdelim extends Ldelim {
 	 * @return string compiled code
 	 * @throws \Smarty\CompilerException
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		parent::compile($args, $compiler);
 		return $compiler->getTemplate()->getRightDelimiter();
 	}

src/Compile/Tag/Section.php

@@ -82,7 +82,8 @@ class Section extends ForeachSection {
 	 * @throws \Smarty\CompilerException
 	 * @throws \Smarty\Exception
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$compiler->loopNesting++;
 		// check and get attributes
 		$_attr = $this->getAttributes($compiler, $args);

src/Compile/Tag/SectionClose.php

@@ -25,7 +25,8 @@ class SectionClose extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$compiler->loopNesting--;
 
 		[$openTag, $nocache_pushed] = $this->closeTag($compiler, ['section', 'sectionelse']);

src/Compile/Tag/SectionElse.php

@@ -20,7 +20,8 @@ class SectionElse extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		[$openTag, $nocache_pushed] = $this->closeTag($compiler, ['section']);
 		$this->openTag($compiler, 'sectionelse', ['sectionelse', $nocache_pushed]);
 		return "<?php }} else {\n ?>";

src/Compile/Tag/Setfilter.php

@@ -21,7 +21,8 @@ class Setfilter extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$compiler->variable_filter_stack[] = $compiler->getSmarty()->getDefaultModifiers();
 
 		// The modifier_list is passed as an array of array's. The inner arrays have the modifier at index 0,

src/Compile/Tag/SetfilterClose.php

@@ -29,7 +29,8 @@ class SetfilterClose extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$this->getAttributes($compiler, $args);
 
 		// reset variable filter to previous state

src/Compile/Tag/WhileClose.php

@@ -28,7 +28,8 @@ class WhileClose extends Base {
 	 *
 	 * @return string compiled code
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$compiler->loopNesting--;
 
 		$nocache_pushed = $this->closeTag($compiler, ['while']);

src/Compile/Tag/WhileTag.php

@@ -22,7 +22,8 @@ class WhileTag extends Base {
 	 * @return string compiled code
 	 * @throws \Smarty\CompilerException
 	 */
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$compiler->loopNesting++;
 
 		if ($compiler->tag_nocache) {

tests/UnitTests/SmartyMethodsTests/RegisterBlock/RegisterBlockTest.php

@@ -304,7 +304,8 @@ class blockparamsCompiler extends \Smarty\Compile\Base {
 	protected $shorttag_order = ["first", "second"];
 	protected $optional_attributes = ["first", "second"];
 
-	public function compile($args, Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 		$_attr = $this->getAttributes($compiler, $args);
 
 		$output = '';

tests/UnitTests/TemplateSource/TagTests/CompilerPlugin/PHPunitplugins/compiler.test.php

@@ -6,7 +6,8 @@ use Smarty\Compile\Base;
 class smarty_compiler_test extends Base
 {
 
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
         $this->required_attributes = array('data');
 
         $_attr = $this->getAttributes($compiler, $args);

tests/UnitTests/TemplateSource/TagTests/CompilerPlugin/PHPunitplugins/compiler.testclose.php

@@ -6,7 +6,8 @@ use Smarty\Compile\Base;
 class smarty_compiler_testclose extends Base
 {
 
-	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null) {
+	public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
 
 		$this->closeTag($compiler, 'test');
 

tests/UnitTests/__shared/PHPunitplugins/compiler.getparamsshort.php

@@ -41,8 +41,8 @@ class smarty_compiler_getparamsshort extends Base
      */
     public $shorttag_order = array('s1', 's2', 's3');
 
-    public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null)
-    {
+    public function compile($args, \Smarty\Compiler\Template $compiler, $parameter = [], $tag = null, $function = null): string
+	{
         $_attr = $this->getAttributes($compiler, $args);
         $output = '<?php echo "array(';
              foreach ($_attr as $key => $value) {