function getPluginData($filename) { 
... 
  // get plugin data 
  $pluginData = array(); 
  $fileContent = file_get_contents($filepath); 
  foreach ($textKeyToFieldname as $textKey => $fieldname) { 
    if($textKey == 'Description'){ 
      preg_match_all("/$textKey:(.*?)(\r|\n)/mi", $fileContent, $matches); // match \r as well for mac users who uploaded file in ascii with wrong line end chars (and windows users who would be \r\n) 
      for($i=0;$i<count($matches[1]);$i+=1){ 
        if(isset($pluginData[$fieldname])) $pluginData[$fieldname] .= ($matches[1][$i]); 
        else $pluginData[$fieldname] = ($matches[1][$i]); 
      } 
    }else { 
      preg_match("/$textKey:(.*?)(\r|\n)/mi", $fileContent, $matches); // match \r as well for mac users who uploaded file in ascii with wrong line end chars (and windows users who would be \r\n) 
      $pluginData[$fieldname] = trim( @$matches[1] );  
    } 
  } 
... 
}

<?php 
/** 
 * Plugin Name: PI Name 
 * Description: My very long description ...... 
 * Description: that goes on and on and on 
 * Description: but I don't have to scroll to read it. 
 * Description: Wouldn't this be nice. 
 * Version: 1.0 beta 
 * Requires at least: 2.00  
 */