diff --git a/composer.json b/composer.json
index 889cb944..9a5e7fd6 100644
--- a/composer.json
+++ b/composer.json
@@ -40,7 +40,7 @@
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "6.4.1",
+        "phpunit/phpunit": "6.4.1 || ^5.7 || ^4.8",
         "smarty/smarty-lexer": "^3.1"
     }
 }
diff --git a/libs/sysplugins/smarty_internal_parsetree_template.php b/libs/sysplugins/smarty_internal_parsetree_template.php
index 477232ef..ab4c3ec3 100644
--- a/libs/sysplugins/smarty_internal_parsetree_template.php
+++ b/libs/sysplugins/smarty_internal_parsetree_template.php
@@ -127,12 +127,12 @@ class Smarty_Internal_ParseTree_Template extends Smarty_Internal_ParseTree
     }
 
     private function getChunkedSubtrees() {
-    	$chunks = [];
+    	$chunks = array();
     	$currentMode = null;
-    	$currentChunk = [];
+    	$currentChunk = array();
 	    for ($key = 0, $cnt = count($this->subtrees); $key < $cnt; $key++) {
 
-	    	if ($this->subtrees[ $key ]->data === '' && in_array($currentMode, ['textstripped', 'text', 'tag'])) {
+	    	if ($this->subtrees[ $key ]->data === '' && in_array($currentMode, array('textstripped', 'text', 'tag'))) {
 	    		continue;
 	    	}
 
@@ -150,19 +150,19 @@ class Smarty_Internal_ParseTree_Template extends Smarty_Internal_ParseTree
 		    if ($newMode == $currentMode) {
 			    $currentChunk[] = $this->subtrees[ $key ];
 		    } else {
-		    	$chunks[] = [
+		    	$chunks[] = array(
 		    		'mode' => $currentMode,
 				    'subtrees' => $currentChunk
-			    ];
+			    );
 		    	$currentMode = $newMode;
-			    $currentChunk = [$this->subtrees[ $key ]];
+			    $currentChunk = array($this->subtrees[ $key ]);
 		    }
 	    }
 	    if ($currentMode && $currentChunk) {
-		    $chunks[] = [
+		    $chunks[] = array(
 			    'mode' => $currentMode,
 			    'subtrees' => $currentChunk
-		    ];
+		    );
 	    }
 		return $chunks;
     }
diff --git a/tests/UnitTests/TemplateSource/TagTests/Foreach/CompileForeachTest.php b/tests/UnitTests/TemplateSource/TagTests/Foreach/CompileForeachTest.php
index ac186b58..78a5214f 100644
--- a/tests/UnitTests/TemplateSource/TagTests/Foreach/CompileForeachTest.php
+++ b/tests/UnitTests/TemplateSource/TagTests/Foreach/CompileForeachTest.php
@@ -95,7 +95,7 @@ class CompileForeachTest extends PHPUnit_Smarty
             array('{foreach $foo x y foo}{$y}.{$x},{foreachelse}else{/foreach}total{$smarty.foreach.foo.total}', array(9,10,11), '0.9,1.10,2.11,total3', '', $i ++),
             array('{$x = "hallo"}{$bar=[1,2,3]}{foreach $foo as $x}outer={$x@index}.{$x}#{foreach $bar as $x}inner={$x@index}.{$x}{/foreach}##{/foreach}###{$x}', array(9,10,11), 'outer=0.9#inner=0.1inner=1.2inner=2.3##outer=1.10#inner=0.1inner=1.2inner=2.3##outer=2.11#inner=0.1inner=1.2inner=2.3#####hallo', '', $i ++),
 	        array('{foreach $foo as $x}{$x}{foreachelse}else{/foreach}', null, 'else', '', $i ++),
-	        array('{foreach $foo as $x}{$x}{foreachelse}else{/foreach}', [], 'else', '', $i ++),
+	        array('{foreach $foo as $x}{$x}{foreachelse}else{/foreach}', array(), 'else', '', $i ++),
 	        array('{foreach $foo as $x}{$x}{foreachelse}else{/foreach}', new \ArrayIterator(), 'else', '', $i ++),
         );
     }
diff --git a/tests/UnitTests/TemplateSource/ValueTests/PHPfunctions/PhpFunctionTest.php b/tests/UnitTests/TemplateSource/ValueTests/PHPfunctions/PhpFunctionTest.php
index 8f13e315..7534e024 100644
--- a/tests/UnitTests/TemplateSource/ValueTests/PHPfunctions/PhpFunctionTest.php
+++ b/tests/UnitTests/TemplateSource/ValueTests/PHPfunctions/PhpFunctionTest.php
@@ -57,7 +57,7 @@ class PhpFunctionTest extends PHPUnit_Smarty
     public function testEmpty2()
     {
         if (version_compare(phpversion(), '5.5', '<')) {
-            $this->markTestSkipped('runs only on PHP > 5.5');
+            $this->markTestSkipped('runs only on PHP >= 5.5');
         }
 
         $this->smarty->disableSecurity();
@@ -82,7 +82,7 @@ class PhpFunctionTest extends PHPUnit_Smarty
     public function testEmpty3()
     {
         if (version_compare(phpversion(), '5.5', '<')) {
-            $this->markTestSkipped('runs only on PHP > 5.5');
+            $this->markTestSkipped('runs only on PHP >= 5.5');
         }
         $this->smarty->disableSecurity();
         $this->smarty->assign('var', array(true,
@@ -104,7 +104,7 @@ class PhpFunctionTest extends PHPUnit_Smarty
     public function testEmpty4()
     {
         if (version_compare(phpversion(), '5.5', '<')) {
-        $this->markTestSkipped('runs only on PHP > 5.5');
+        $this->markTestSkipped('runs only on PHP >= 5.5');
         }
 
         $this->smarty->disableSecurity();
@@ -168,11 +168,11 @@ class PhpFunctionTest extends PHPUnit_Smarty
 		$this->smarty->disableSecurity();
 
 		$this->smarty->assign('varobject', new TestIsset());
-		$this->smarty->assign('vararray', $vararray = [
+		$this->smarty->assign('vararray', $vararray = array(
 			'keythatexists' => false,
-			'keywitharray' => [1 => 1],
-			'keywithobject' => new TestIsset()]
-		);
+			'keywitharray' => array(1 => 1),
+			'keywithobject' => new TestIsset()
+		));
 
 		$this->smarty->assign('key', 'A');
 		$this->smarty->assign('_varsimpleA', 1);
@@ -234,4 +234,4 @@ class TestIsset {
     public function pass($v) {
         return $v;
     }
-}
\ No newline at end of file
+}