RISWriter.php

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<?php
namespace LibRIS;

class RISWriter {

  public function __construct() {}

  public function writeRecords($records) {
    $buffer = array();
    foreach ($records as $record) {
      $buffer[] = $this->writeRecord($record);
    }
    return implode(RISReader::RIS_EOL, $buffer);
  }

  public function writeRecord($tags) {
    $buffer = array();
    $fmt = '%s  - %s';

         $buffer[] = sprintf($fmt, 'TY', $tags['TY'][0]);
         unset($tags['TY']);

    foreach ($tags as $tag => $values) {
      foreach ($values as $value) {
        $buffer[] = sprintf($fmt, $tag, $value);
      }
    }
    $buffer[] = 'ER  - ';

    return implode(RISReader::RIS_EOL, $buffer);
  }

}