Subversion Repositories computer_asset_manager_v1

<?php

   class CsvImporter

   {

       private $fp;

       private $parse_header;

       private $header;

       private $delimiter;

       private $length;

       private $analysis;

       public $lines;

       //--------------------------------------------------------------------

       function __construct($file_name, $parse_header=false, $delimiter='', $length=8000)

       {

           // auto detect mac file endings

           ini_set('auto_detect_line_endings',TRUE);

           $this->parse_header = $parse_header;

           $this->delimiter = $delimiter;

           if ( $delimiter === '' ) { # do an auto-detect on the file

              $this->analysis = $this->analyse_file( $file_name );

              $this->delimiter = $this->analysis['delimiter']['value'];

            } else {

               $this->delimiter = $delimiter;

            }

            $this->length = $length;

            $this->lines = 0;

           $this->fp = fopen($file_name, "r");

           if ($this->parse_header)

           {

              $this->header = fgetcsv($this->fp, $this->length, $this->delimiter);

           }

       }

       //--------------------------------------------------------------------

       function __destruct()

       {

           if ($this->fp)

           {

               fclose($this->fp);

           }

       }

       //--------------------------------------------------------------------

       function get($max_lines=0)

       {

           //if $max_lines is set to 0, then get all the data

           $data = array();

           if ($max_lines > 0)

               $line_count = 0;

           else

               $line_count = -1; // so loop limit is ignored

           while ($line_count < $max_lines && ($row = fgetcsv($this->fp, $this->length, $this->delimiter)) !== FALSE)

           {

               if ($this->parse_header)

               {

                   foreach ($this->header as $i => $heading_i)

                   {

                       $row_new[$heading_i] = $row[$i];

                   }

                   $data[] = $row_new;

               }

               else

               {

                   $data[] = $row;

               }

               if ($max_lines > 0)

                   $line_count++;

           }

           $this->lines += $line_count;

           return $data;

       } 

      /*

       *  taken from http://php.net/manual/en/function.fgetcsv.php

       * opens $file and reads up to $capture_limit_in_kb bytes

       * then analyzes and attempts to determine line endings and delimiters

       * returns results as an array with keys

       *    peak_mem

       *    line_endings

       *    lines

       *    delimiter

       *    read_kb

       */

      function analyse_file($file, $capture_limit_in_kb = 10) {

          // capture starting memory usage

          $output['peak_mem']['start']    = memory_get_peak_usage(true);

          // log the limit how much of the file was sampled (in Kb)

          $output['read_kb']                 = $capture_limit_in_kb;

          // read in file

          $fh = fopen($file, 'r');

              $contents = fread($fh, ($capture_limit_in_kb * 1024)); // in KB

          fclose($fh);

          // specify allowed field delimiters

          $delimiters = array(

              'comma'     => ',',

              'semicolon' => ';',

              'tab'         => "\t",

              'pipe'         => '|',

              'colon'     => ':'

          );

          // specify allowed line endings

          $line_endings = array(

              'rn'         => "\r\n",

              'n'         => "\n",

              'r'         => "\r",

              'nr'         => "\n\r"

          );

          // loop and count each line ending instance

          foreach ($line_endings as $key => $value) {

              $line_result[$key] = substr_count($contents, $value);

          }

          // sort by largest array value

          asort($line_result);

          // log to output array

          $output['line_ending']['results']     = $line_result;

          $output['line_ending']['count']     = end($line_result);

          $output['line_ending']['key']         = key($line_result);

          $output['line_ending']['value']     = $line_endings[$output['line_ending']['key']];

          $lines = explode($output['line_ending']['value'], $contents);

          // remove last line of array, as this maybe incomplete?

          array_pop($lines);

          // create a string from the legal lines

          $complete_lines = implode(' ', $lines);

          // log statistics to output array

          $output['lines']['count']     = count($lines);

          $output['lines']['length']     = strlen($complete_lines);

          // loop and count each delimiter instance

          foreach ($delimiters as $delimiter_key => $delimiter) {

              $delimiter_result[$delimiter_key] = substr_count($complete_lines, $delimiter);

          }

          // sort by largest array value

          asort($delimiter_result);

          // log statistics to output array with largest counts as the value

          $output['delimiter']['results']     = $delimiter_result;

          $output['delimiter']['count']         = end($delimiter_result);

          $output['delimiter']['key']         = key($delimiter_result);

          $output['delimiter']['value']         = $delimiters[$output['delimiter']['key']];

          // capture ending memory usage

          $output['peak_mem']['end'] = memory_get_peak_usage(true);

          return $output;

      }

   } // class CsvImporter

?>