title: PHP DOMDocument missing
body: <p>I am getting an odd error when running $dom = new DOMDocument("1.0", "utf-8");:
  <b>Warning</b>:  require_once(classes/DOMDocument.class.php) [function.require-once]: failed to open stream: No such file or directory in <b>/var/www/html/cms/bootstrap.php</b> on line <b>5</b><br />
  <br />
  <b>Fatal error</b>:  require_once() [function.require]: Failed opening required 'classes/DOMDocument.class.php' (include_path='.:/usr/share/pear:/usr/share/php:/var/www/html/cms/plugins/Zend/library') in <b>/var/www/html/cms/bootstrap.php</b> on line <b>5</b><br /></p>
  
  <p>According to php.net/manual/en/dom.setup.php, I need php-xml installed. I have tried this but it also errors out...</p>
  
  <pre><code>[user@lnxcmsdev cms]$ sudo yum install php-xml
  Loaded plugins: fastestmirror
  Loading mirror speeds from cached hostfile
   * addons: mirror.web-ster.com
   * base: mirror.hmc.edu
   * extras: mirror.hmc.edu
   * rpmforge: ftp-stud.fht-esslingen.de
   * updates: mirror.rocketinternet.net
  Setting up Install Process
  Resolving Dependencies
  --&gt; Running transaction check
  ---&gt; Package php-xml.i386 0:5.1.6-27.el5_5.3 set to be updated
  --&gt; Processing Dependency: php-common = 5.1.6-27.el5_5.3 for package: php-xml
  --&gt; Finished Dependency Resolution
  php-xml-5.1.6-27.el5_5.3.i386 from updates has depsolving problems
    --&gt; Missing Dependency: php-common = 5.1.6-27.el5_5.3 is needed by package php-xml-5.1.6-27.el5_5.3.i386 (updates)
  Error: Missing Dependency: php-common = 5.1.6-27.el5_5.3 is needed by package php-xml-5.1.6-27.el5_5.3.i386 (updates)
   You could try using --skip-broken to work around the problem
   You could try running: package-cleanup --problems
                          package-cleanup --dupes
                          rpm -Va --nofiles --nodigest
  The program package-cleanup is found in the yum-utils package.
  [user@lnxcmsdev cms]$ sudo yum install php-common
  Loaded plugins: fastestmirror
  Loading mirror speeds from cached hostfile
   * addons: mirror.web-ster.com
   * base: mirror.hmc.edu
   * extras: mirror.hmc.edu
   * rpmforge: ftp-stud.fht-esslingen.de
   * updates: mirror.rocketinternet.net
  Setting up Install Process
  Package matching php-common-5.1.6-27.el5_5.3.i386 already installed. Checking for update.
  Nothing to do
  </code></pre>
  
  <p>Ideas??</p>