application/helpers/persist_pdf.php

   1 <?php defined('SYSPATH') OR die('No direct access allowed.');
   2
   3 /**
   4  * PDF help class
   5  *
   6  * @todo since this works for csv files as well, rename the class to something
   7  * like persist_file
   8  */
   9 class persist_pdf
  10 {
  11         /**
  12          * Turns my_report.csv into my_report-2011-03-23.csv and, perhaps,
  13          * my_report.pdf into my_report-2011-03-23-dsaf43.pdf
  14          *
  15          * @param $data The file to write
  16          * @param $save_here string
  17          * @throws Exception with reason of failure
  18          * @return string filename of new file
  19          */
  20         static function save($data, $save_here) {
  21                 $save_here = (string) $save_here;
  22                 if(!is_writable(pathinfo($save_here, PATHINFO_DIRNAME))) {
  23                         throw new Exception("Can't write output file '$save_here'");
  24                 }
  25                 $file_extension = 'pdf';
  26                 if('.csv' == substr($save_here, -4 , 4)) {
  27                         $file_extension = 'csv';
  28                 }
  29
  30                 $local_persistent_filepath = pathinfo($save_here, PATHINFO_DIRNAME);
  31                 $stripped_name = pathinfo($save_here, PATHINFO_BASENAME);
  32                 $local_persistent_filepath .= '/'.preg_replace('/\.'.$file_extension.'$/', null, $stripped_name).'-'.date('Y-m-d').'.'.$file_extension;
  33                 $safety_limit = 1000;
  34                 $current_try = 1;
  35                 while(file_exists($local_persistent_filepath)) {
  36                         $local_persistent_filepath = preg_replace(
  37                                 '~(-[a-h0-9]{6})?\.'.$file_extension.'$~',
  38                                 '-'.substr(md5(rand()), 0, 6).'.'.$file_extension,
  39                                 $local_persistent_filepath
  40                         );
  41                         if(++$current_try > $safety_limit) {
  42                                 throw new Exception("Do not want to overwrite '$local_persistent_filepath', aborting. Please remove the already existing reports.");
  43                         }
  44                 }
  45                 $ok = file_put_contents($local_persistent_filepath, $data);
  46                 if(!$ok) {
  47                         throw new Exception("Failed to write to '$local_persistent_filepath'");
  48                 }
  49                 return $local_persistent_filepath;
  50         }
  51 }