title: Class 'ZipArchive' not found in PHPExcel
body: <p>I get the following error in a program called "Collective Access", but I am not sure where to go to from here given that I haven't ever had an experience with this type of issue before:</p>
  
  <pre><code>PHP Fatal error:  Uncaught Error: Class 'ZipArchive' not found in /var/www/html/providence/app/lib/core/Parsers/PHPExcel/PHPExcel/Reader/Excel2007.php:94
  Stack trace:
  #0 /var/www/html/providence/app/lib/core/Parsers/PHPExcel/PHPExcel/IOFactory.php(268): PHPExcel_Reader_Excel2007-&gt;canRead('project/mapping...')
  #1 /var/www/html/providence/app/lib/core/Parsers/PHPExcel/PHPExcel/IOFactory.php(191): PHPExcel_IOFactory::createReaderForFile('project/mapping...')
  #2 /var/www/html/providence/app/models/ca_data_importers.php(768): PHPExcel_IOFactory::load('project/mapping...')
  #3 /var/www/html/providence/app/lib/ca/Utils/CLIUtils.php(1147): ca_data_importers::loadImporterFromFile('project/mapping...', Array, Array)
  #4 /var/www/html/providence/support/bin/caUtils(166): CLIUtils::load_import_mapping(Object(Zend_Console_Getopt))
  #5 {main}
    thrown in /var/www/html/providence/app/lib/core/Parsers/PHPExcel/PHPExcel/Reader/Excel2007.php on line 94
  </code></pre>
  
  <p>PS - This is the code around line 94 of the file it is referring to:</p>
  
  <pre><code>$xl = false;
      // Load file
      $zip = new $zipClass;
      if ($zip-&gt;open($pFilename) === true) {
          // check if it is an OOXML archive
          $rels = simplexml_load_string($this-&gt;_getFromZipArchive($zip, "_rels/.rels"), 'SimpleXMLElement', PHPExcel_Settings::getLibXmlLoaderOptions());
          if ($rels !== false) {
              foreach ($rels-&gt;Relationship as $rel) {
                  switch ($rel["Type"]) {
                      case "http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument":
                          if (basename($rel["Target"]) == 'workbook.xml') {
                              $xl = true;
                          }
                          break;
  
                  }
              }
          }
          $zip-&gt;close();
      }
  
      return $xl;
  }
  </code></pre>
  
  <h2>Edit</h2>
  
  <p>I'm using 7.0.15-0ubuntu0.16.04.4 for php (or just version 7.0 on Ubuntu Server 16.04.4)</p>