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    <p>As with anything, there are many approaches with their own advantages and disadvantages.</p> <p>My (current) preference is to combine class methods (static) and object methods for handling groups of objects and individual objects, respectively.</p> <p>Consider the following code:</p> <pre><code>class Survey { public $id; public $uid; public $rate; public $reason; public $complete; public $opinion; public function save() { drupal_write_record('survey', $this); } /** * Loads survey from secondary storage * * @param string $id Unique surevy ID */ public function load( $id ) { // loads a survey from secondary storage } /** * Returns report of survey results. * * @param array $surveys array of surveys to process. If not passed or NULL, * The whole set of completed surveys will be processed. * @return string HTML Formatted report */ public static function compile_results( $surveys = NULL ) { if( empty( $surveys ) ) { $surveys = self::get_completed_results(); } foreach( $surveys as &amp;$survey ) { // process an individual survey, possibly aggregating it } } /** * Retreives completed surveys from secondary storage. * * @return array Array of completed Survey objects */ public static function get_completed_surveys() { $surveys = array(); // Select all surveys from secondary storage $survey_rows = array(); //replace with code to get surveys foreach( $survey_rows as $survey_row ) { $survey = new Survey(); $survey['id'] = $survey_row['id']; $survey['uid'] = $survey_row['uid']; $survey['rate'] = $survey_row['rate']; $survey['reason'] = $survey_row['reason']; $survey['complete'] = $survey_row['complete']; $survey['opinion'] = $survey_row['opinion']; $surveys[] = $survey; } return $surveys; } } </code></pre> <p>You can use the static methods to work with groups of objects. You could even have a static array holding a reference to each loaded survey.</p> <p>Another option is to have a "Surveys" class whose purpose is to work with groups of surveys. The previous approach feels cleaner to me.</p>
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