AverageField.php
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<?php
/*
"Contact Form to Database" Copyright (C) 2011-2012 Michael Simpson (email : michael.d.simpson@gmail.com)
This file is part of Contact Form to Database.
Contact Form to Database is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Contact Form to Database is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Contact Form to Database.
If not, see <http://www.gnu.org/licenses/>.
*/
require_once('CFDBTransform.php');
class AverageField implements CFDBTransform {
/**
* @var string field holding the value
*/
var $valueField;
/**
* @var string field to group by
*/
var $groupByField;
/**
* @var array of $groupByField => sum
*/
var $sums = array();
/**
* @var array of $groupByField => count
*/
var $counts = array();
function __construct($valueField, $groupByField = null) {
$this->valueField = $valueField;
$this->groupByField = $groupByField;
}
public function addEntry(&$entry) {
if (array_key_exists($this->valueField, $entry) && is_numeric($entry[$this->valueField])) {
$value = $entry[$this->valueField];
$groupByName = empty($this->groupByField) ? $this->valueField : $entry[$this->groupByField];
if ($value !== null && $value !== '') {
if (!array_key_exists($groupByName, $this->sums)) {
$this->sums[$groupByName] = $value;
$this->counts[$groupByName] = 1;
} else {
$this->sums[$groupByName] += $value;
$this->counts[$groupByName]++;
}
}
}
}
public function getTransformedData() {
$data = array();
foreach (array_keys($this->sums) as $name) {
$average = $this->sums[$name] / $this->counts[$name];
if (empty($this->groupByField)) {
$data[] = array($this->valueField => $average);
} else {
$data[] = array($this->groupByField => $name, $this->valueField => $average);
}
}
return $data;
}
}