Allow to change cell width unit

src/PhpWord/Style/Cell.php

@@ -55,6 +55,13 @@ class Cell extends Border
      */
     const DEFAULT_BORDER_COLOR = '000000';
 
+    /**
+     * @const string Cell width units http://officeopenxml.com/WPtableCellProperties-Width.php
+     */
+    const WIDTH_AUTO = 'auto'; // Automatically determined width
+    const WIDTH_PERCENT = 'pct'; // Width in fiftieths (1/50) of a percent (1% = 50 unit)
+    const WIDTH_TWIP = 'dxa'; // Width in twentieths (1/20) of a point (twip)
+
     /**
      * Vertical align (top, center, both, bottom)
      *
@@ -93,6 +100,11 @@ class Cell extends Border
      */
     private $shading;
 
+    /**
+     * @var string Width unit
+     */
+    private $unit = self::WIDTH_TWIP;
+
     /**
      * Get vertical align.
      *
@@ -236,6 +248,30 @@ public function setShading($value = null)
         return $this;
     }
 
+    /**
+     * Get width unit
+     *
+     * @return string
+     */
+    public function getUnit()
+    {
+        return $this->unit;
+    }
+
+    /**
+     * Set width unit
+     *
+     * @param string $value
+     * @return Cell
+     */
+    public function setUnit($value)
+    {
+        $enum = array(self::WIDTH_AUTO, self::WIDTH_PERCENT, self::WIDTH_TWIP);
+        $this->unit = $this->setEnumVal($value, $enum, $this->unit);
+
+        return $this;
+    }
+
     /**
      * Get default border color
      *

src/PhpWord/Writer/Word2007/Style/Cell.php

@@ -47,10 +47,12 @@ public function write()
         $xmlWriter->startElement('w:tcPr');
 
         // Width
-        $xmlWriter->startElement('w:tcW');
-        $xmlWriter->writeAttribute('w:w', $this->width);
-        $xmlWriter->writeAttribute('w:type', 'dxa');
-        $xmlWriter->endElement(); // w:tcW
+        if (!is_null($this->width)) {
+            $xmlWriter->startElement('w:tcW');
+            $xmlWriter->writeAttribute('w:w', $this->width);
+            $xmlWriter->writeAttribute('w:type', $style->getUnit());
+            $xmlWriter->endElement(); // w:tcW
+        }
 
         // Text direction
         $textDir = $style->getTextDirection();