diff --git a/src/PhpWord/Element/AbstractContainer.php b/src/PhpWord/Element/AbstractContainer.php
index 39193031..6caa0056 100644
--- a/src/PhpWord/Element/AbstractContainer.php
+++ b/src/PhpWord/Element/AbstractContainer.php
@@ -35,7 +35,7 @@ abstract class AbstractContainer extends AbstractElement
     protected $elements = array();
 
     /**
-     * Container type section|header|footer|footnote|endnote|cell|textrun|textbox
+     * Container type Section|Header|Footer|Footnote|Endnote|Cell|TextRun|TextBox|ListItemRun
      *
      * @var string
      */
@@ -63,9 +63,7 @@ abstract class AbstractContainer extends AbstractElement
         }
 
         // Create element
-        if ($argsCount == 1) {       // Page Break
-            $element = new $elementClass();
-        } elseif ($argsCount == 2) { // TextRun, TextBox, Table, Footnote, Endnote
+        if ($argsCount == 2) {       // TextRun, TextBox, Table, Footnote, Endnote
             $element = new $elementClass($args[1]);
         } elseif ($argsCount == 3) { // Object, TextBreak, Title
             $element = new $elementClass($args[1], $args[2]);
@@ -75,11 +73,13 @@ abstract class AbstractContainer extends AbstractElement
             $element = new $elementClass($args[1], $args[2], $args[3], $args[4]);
         } elseif ($argsCount == 6) { // ListItem
             $element = new $elementClass($args[1], $args[2], $args[3], $args[4], $args[5]);
+        } else {                     // Page Break
+            $element = new $elementClass();
         }
 
         // Set relation Id for media collection
+        $mediaContainer = $this->getMediaContainer();
         if (in_array($elementName, array('Link', 'Image', 'Object'))) {
-            $mediaContainer = $this->getMediaContainer();
             if ($elementName == 'Image') {
                 $rId = Media::addElement($mediaContainer, strtolower($elementName), $args[1], $element);
             } else {
@@ -228,7 +228,6 @@ abstract class AbstractContainer extends AbstractElement
      *
      * @param mixed $style
      * @return \PhpOffice\PhpWord\Element\Table
-     * @todo Merge with the same function on Footer
      */
     public function addTable($style = null)
     {
diff --git a/src/PhpWord/Writer/HTML/Element/Footnote.php b/src/PhpWord/Writer/HTML/Element/Footnote.php
index 30398b17..ba5ced56 100644
--- a/src/PhpWord/Writer/HTML/Element/Footnote.php
+++ b/src/PhpWord/Writer/HTML/Element/Footnote.php
@@ -41,12 +41,14 @@ class Footnote extends AbstractElement
         if (!$this->element instanceof \PhpOffice\PhpWord\Element\Footnote) {
             return;
         }
+        /** @var \PhpOffice\PhpWord\Writer\HTML $parentWriter Scrutinizer type hint */
+        $parentWriter = $this->parentWriter;
 
-        $noteId = count($this->parentWriter->getNotes()) + 1;
+        $noteId = count($parentWriter->getNotes()) + 1;
         $noteMark = $this->noteType . '-' . $this->element->getRelationId();
         $content = "<a name=\"{$noteMark}\"><a href=\"#note-{$noteId}\" class=\"NoteRef\"><sup>{$noteId}</sup></a>";
 
-        $this->parentWriter->addNote($noteId, $noteMark);
+        $parentWriter->addNote($noteId, $noteMark);
 
         return $content;
     }
diff --git a/src/PhpWord/Writer/HTML/Element/Image.php b/src/PhpWord/Writer/HTML/Element/Image.php
index 5c2edbb2..1d07acd7 100644
--- a/src/PhpWord/Writer/HTML/Element/Image.php
+++ b/src/PhpWord/Writer/HTML/Element/Image.php
@@ -37,9 +37,11 @@ class Image extends Text
         if (!$this->element instanceof \PhpOffice\PhpWord\Element\Image) {
             return;
         }
+        /** @var \PhpOffice\PhpWord\Writer\HTML $parentWriter Scrutinizer type hint */
+        $parentWriter = $this->parentWriter;
 
         $content = '';
-        if (!$this->parentWriter->isPdf()) {
+        if (!$parentWriter->isPdf()) {
             $imageData = $this->getBase64ImageData($this->element);
             if (!is_null($imageData)) {
                 $styleWriter = new ImageStyleWriter($this->element->getStyle());
diff --git a/src/PhpWord/Writer/HTML/Element/Text.php b/src/PhpWord/Writer/HTML/Element/Text.php
index 883a8cd3..8ace129c 100644
--- a/src/PhpWord/Writer/HTML/Element/Text.php
+++ b/src/PhpWord/Writer/HTML/Element/Text.php
@@ -64,12 +64,14 @@ class Text extends AbstractElement
      */
     public function write()
     {
+        /** @var \PhpOffice\PhpWord\Element\Text $element Scrutinizer type hint */
+        $element = $this->element;
         $this->getFontStyle();
 
         $content = '';
         $content .= $this->writeOpening();
         $content .= $this->openingTags;
-        $content .= htmlspecialchars($this->element->getText());
+        $content .= htmlspecialchars($element->getText());
         $content .= $this->closingTags;
         $content .= $this->closingText;
         $content .= $this->writeClosing();
@@ -140,12 +142,14 @@ class Text extends AbstractElement
      */
     private function getParagraphStyle()
     {
+        /** @var \PhpOffice\PhpWord\Element\Text $element Scrutinizer type hint */
+        $element = $this->element;
         $style = '';
-        if (method_exists($this->element, 'getParagraphStyle')) {
+        if (method_exists($element, 'getParagraphStyle')) {
             return $style;
         }
 
-        $paragraphStyle = $this->element->getParagraphStyle();
+        $paragraphStyle = $element->getParagraphStyle();
         $pStyleIsObject = ($paragraphStyle instanceof Paragraph);
         if ($pStyleIsObject) {
             $styleWriter = new ParagraphStyleWriter($paragraphStyle);
@@ -164,8 +168,10 @@ class Text extends AbstractElement
      */
     private function getFontStyle()
     {
+        /** @var \PhpOffice\PhpWord\Element\Text $element Scrutinizer type hint */
+        $element = $this->element;
         $style = '';
-        $fontStyle = $this->element->getFontStyle();
+        $fontStyle = $element->getFontStyle();
         $fStyleIsObject = ($fontStyle instanceof Font);
         if ($fStyleIsObject) {
             $styleWriter = new FontStyleWriter($fontStyle);
diff --git a/src/PhpWord/Writer/HTML/Style/Image.php b/src/PhpWord/Writer/HTML/Style/Image.php
index fcf18395..db6ac57b 100644
--- a/src/PhpWord/Writer/HTML/Style/Image.php
+++ b/src/PhpWord/Writer/HTML/Style/Image.php
@@ -37,8 +37,10 @@ class Image extends AbstractStyle
         }
         $css = array();
 
-        $css['width'] = $this->getValueIf($style->getWidth(), $style->getWidth() . 'px');
-        $css['height'] = $this->getValueIf($style->getHeight(), $style->getHeight() . 'px');
+        $width = $style->getWidth();
+        $height = $style->getHeight();
+        $css['width'] = $this->getValueIf(is_numeric($width), $width . 'px');
+        $css['height'] = $this->getValueIf(is_numeric($height), $height . 'px');
 
         return $this->assembleCss($css);
     }
diff --git a/src/PhpWord/Writer/RTF/Element/Text.php b/src/PhpWord/Writer/RTF/Element/Text.php
index 701a5be1..27172df3 100644
--- a/src/PhpWord/Writer/RTF/Element/Text.php
+++ b/src/PhpWord/Writer/RTF/Element/Text.php
@@ -39,12 +39,15 @@ class Text extends AbstractElement
             return;
         }
 
+        /** @var \PhpOffice\PhpWord\Style\Font $fontStyle Scrutinizer type hint */
         $fontStyle = $this->getFontStyle($this->element);
+        /** @var \PhpOffice\PhpWord\Writer\RTF $parentWriter Scrutinizer type hint */
+        $parentWriter = $this->parentWriter;
 
         $content = '';
         $content .= $this->writeParagraphStyle($this->element);
         $content .= $this->writeFontStyleBegin($fontStyle);
-        if ($this->parentWriter->getLastParagraphStyle() != '' || $fontStyle) {
+        if ($parentWriter->getLastParagraphStyle() != '' || $fontStyle) {
             $content .= ' ';
         }
         $content .= $this->element->getText();
@@ -64,6 +67,8 @@ class Text extends AbstractElement
      */
     private function writeParagraphStyle(TextElement $element)
     {
+        /** @var \PhpOffice\PhpWord\Writer\RTF $parentWriter Scrutinizer type hint */
+        $parentWriter = $this->parentWriter;
         $content = '';
 
         // Get paragraph style
@@ -74,15 +79,15 @@ class Text extends AbstractElement
 
         // Write style when applicable
         if ($paragraphStyle && !$this->withoutP) {
-            if ($this->parentWriter->getLastParagraphStyle() != $element->getParagraphStyle()) {
+            if ($parentWriter->getLastParagraphStyle() != $element->getParagraphStyle()) {
                 $styleWriter = new ParagraphStyleWriter($paragraphStyle);
                 $content = $styleWriter->write();
-                $this->parentWriter->setLastParagraphStyle($element->getParagraphStyle());
+                $parentWriter->setLastParagraphStyle($element->getParagraphStyle());
             } else {
-                $this->parentWriter->setLastParagraphStyle();
+                $parentWriter->setLastParagraphStyle();
             }
         } else {
-            $this->parentWriter->setLastParagraphStyle();
+            $parentWriter->setLastParagraphStyle();
         }
 
         return $content;
@@ -91,7 +96,7 @@ class Text extends AbstractElement
     /**
      * Write font style beginning
      *
-     * @param \PhpOffice\PhpWord\Style\Font $style
+     * @param mixed $style
      * @return string
      */
     private function writeFontStyleBegin($style)
@@ -100,16 +105,19 @@ class Text extends AbstractElement
             return '';
         }
 
+        /** @var \PhpOffice\PhpWord\Writer\RTF $parentWriter Scrutinizer type hint */
+        $parentWriter = $this->parentWriter;
+
         // Create style writer and set color/name index
         $styleWriter = new FontStyleWriter($style);
         if ($style->getColor() != null) {
-            $colorIndex = array_search($style->getColor(), $this->parentWriter->getColorTable());
+            $colorIndex = array_search($style->getColor(), $parentWriter->getColorTable());
             if ($colorIndex !== false) {
                 $styleWriter->setColorIndex($colorIndex + 1);
             }
         }
         if ($style->getName() != null) {
-            $fontIndex = array_search($style->getName(), $this->parentWriter->getFontTable());
+            $fontIndex = array_search($style->getName(), $parentWriter->getFontTable());
             if ($fontIndex !== false) {
                 $styleWriter->setNameIndex($fontIndex + 1);
             }
diff --git a/src/PhpWord/Writer/RTF/Element/TextBreak.php b/src/PhpWord/Writer/RTF/Element/TextBreak.php
index 760f34e8..ff836a88 100644
--- a/src/PhpWord/Writer/RTF/Element/TextBreak.php
+++ b/src/PhpWord/Writer/RTF/Element/TextBreak.php
@@ -31,7 +31,9 @@ class TextBreak extends AbstractElement
      */
     public function write()
     {
-        $this->parentWriter->setLastParagraphStyle();
+        /** @var \PhpOffice\PhpWord\Writer\RTF $parentWriter Scrutinizer type hint */
+        $parentWriter = $this->parentWriter;
+        $parentWriter->setLastParagraphStyle();
 
         return '\par' . PHP_EOL;
     }
diff --git a/src/PhpWord/Writer/RTF/Style/Font.php b/src/PhpWord/Writer/RTF/Style/Font.php
index 5c14eb3a..49c9889c 100644
--- a/src/PhpWord/Writer/RTF/Style/Font.php
+++ b/src/PhpWord/Writer/RTF/Style/Font.php
@@ -53,7 +53,9 @@ class Font extends AbstractStyle
         $content .= '\f' . $this->nameIndex;
         $content .= $this->getValueIf($style->isBold(), '\b');
         $content .= $this->getValueIf($style->isItalic(), '\i');
-        $content .= $this->getValueIf($style->getSize(), '\fs' . ($style->getSize() * 2));
+
+        $size = $style->getSize();
+        $content .= $this->getValueIf(is_numeric($size), '\fs' . ($size * 2));
 
         return $content;
     }
@@ -75,7 +77,9 @@ class Font extends AbstractStyle
         $content .= '\f0';
         $content .= $this->getValueIf($style->isBold(), '\b0');
         $content .= $this->getValueIf($style->isItalic(), '\i0');
-        $content .= $this->getValueIf($style->getSize(), '\fs' . (PhpWord::DEFAULT_FONT_SIZE * 2));
+
+        $size = $style->getSize();
+        $content .= $this->getValueIf(is_numeric($size), '\fs' . (PhpWord::DEFAULT_FONT_SIZE * 2));
 
         return $content;
     }
diff --git a/src/PhpWord/Writer/Word2007/Element/Text.php b/src/PhpWord/Writer/Word2007/Element/Text.php
index 1385e6e6..e06bde6b 100644
--- a/src/PhpWord/Writer/Word2007/Element/Text.php
+++ b/src/PhpWord/Writer/Word2007/Element/Text.php
@@ -92,8 +92,9 @@ class Text extends AbstractElement
     protected function writeParagraphStyle()
     {
         $xmlWriter = $this->getXmlWriter();
-        $element = $this->getElement();
 
+        /** @var \PhpOffice\PhpWord\Element\Text $element Scrutinizer type hint */
+        $element = $this->getElement();
         $paragraphStyle = $element->getParagraphStyle();
         $styleWriter = new ParagraphStyleWriter($xmlWriter, $paragraphStyle);
         $styleWriter->setIsInline(true);
@@ -106,8 +107,9 @@ class Text extends AbstractElement
     protected function writeFontStyle()
     {
         $xmlWriter = $this->getXmlWriter();
-        $element = $this->getElement();
 
+        /** @var \PhpOffice\PhpWord\Element\Text $element Scrutinizer type hint */
+        $element = $this->getElement();
         $fontStyle = $element->getFontStyle();
         $styleWriter = new FontStyleWriter($xmlWriter, $fontStyle);
         $styleWriter->setIsInline(true);
diff --git a/src/PhpWord/Writer/Word2007/Part/ContentTypes.php b/src/PhpWord/Writer/Word2007/Part/ContentTypes.php
index 3af62a44..417df64d 100644
--- a/src/PhpWord/Writer/Word2007/Part/ContentTypes.php
+++ b/src/PhpWord/Writer/Word2007/Part/ContentTypes.php
@@ -32,7 +32,9 @@ class ContentTypes extends AbstractPart
      */
     public function write()
     {
-        $contentTypes = $this->getParentWriter()->getContentTypes();
+        /** @var \PhpOffice\PhpWord\Writer\Word2007 $parentWriter Scrutinizer type hint */
+        $parentWriter = $this->getParentWriter();
+        $contentTypes = $parentWriter->getContentTypes();
 
         $openXMLPrefix = 'application/vnd.openxmlformats-';
         $wordMLPrefix  = $openXMLPrefix . 'officedocument.wordprocessingml.';
diff --git a/src/PhpWord/Writer/Word2007/Part/Footnotes.php b/src/PhpWord/Writer/Word2007/Part/Footnotes.php
index 1eeabc9c..d7a1caaa 100644
--- a/src/PhpWord/Writer/Word2007/Part/Footnotes.php
+++ b/src/PhpWord/Writer/Word2007/Part/Footnotes.php
@@ -106,8 +106,9 @@ class Footnotes extends AbstractPart
         $xmlWriter->endElement(); // w:p
         $xmlWriter->endElement(); // $this->elementNode
 
-        // Content
-        foreach ($this->elements as $element) {
+        /** @var array $elements Scrutinizer type hint */
+        $elements = $this->elements;
+        foreach ($elements as $element) {
             if ($element instanceof Footnote) {
                 $this->writeNote($xmlWriter, $element);
             }
diff --git a/src/PhpWord/Writer/Word2007/Part/RelsDocument.php b/src/PhpWord/Writer/Word2007/Part/RelsDocument.php
index e0773a4a..2a58421c 100644
--- a/src/PhpWord/Writer/Word2007/Part/RelsDocument.php
+++ b/src/PhpWord/Writer/Word2007/Part/RelsDocument.php
@@ -40,7 +40,10 @@ class RelsDocument extends Rels
             'fontTable.xml'    => 'officeDocument/2006/relationships/fontTable',
         );
         $xmlWriter = $this->getXmlWriter();
-        $this->writeRels($xmlWriter, $xmlRels, $this->getParentWriter()->getRelationships());
+
+        /** @var \PhpOffice\PhpWord\Writer\Word2007 $parentWriter Scrutinizer type hint */
+        $parentWriter = $this->getParentWriter();
+        $this->writeRels($xmlWriter, $xmlRels, $parentWriter->getRelationships());
 
         return $xmlWriter->getData();
     }
diff --git a/src/PhpWord/Writer/Word2007/Part/Settings.php b/src/PhpWord/Writer/Word2007/Part/Settings.php
index 862e419e..c296581f 100644
--- a/src/PhpWord/Writer/Word2007/Part/Settings.php
+++ b/src/PhpWord/Writer/Word2007/Part/Settings.php
@@ -126,6 +126,8 @@ class Settings extends AbstractPart
             $xmlWriter->writeElement($settingKey);
         } else {
             $xmlWriter->startElement($settingKey);
+
+            /** @var array $settingValue Scrutinizer type hint */
             foreach ($settingValue as $childKey => $childValue) {
                 if ($childKey == '@attributes') {
                     foreach ($childValue as $key => $val) {