Brady Wetherington
56 lines
1.5 KiB
PHP
56 lines
1.5 KiB
PHP
<?php
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class Depreciatable extends Elegant
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{
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/**
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* Depreciation Relation, and associated helper methods
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*/
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public function depreciation()
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{
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return $this->model->belongsTo('Depreciation','depreciation_id');
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}
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/**
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* @param $purchase_cost
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* @param $purchase_date1
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* @return float|int
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*/
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protected function getCurrentValue()
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{
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if (!$this->depreciation) { // will never happen
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return $this->purchase_cost;
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}
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if ($this->depreciation->months <= 0) {
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return $this->purchase_cost;
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}
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// fraction of value left
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$current_value = round(($this->months_until_depreciated() / ($this->depreciation->months)) * $this->purchase_cost, 2);
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if ($current_value < 0) {
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$current_value = 0;
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}
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return $current_value;
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}
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public function months_until_depreciated()
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{
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// @link http://www.php.net/manual/en/class.datetime.php
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$d1 = new DateTime();
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$d2 = new DateTime($this->depreciated_date());
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// @link http://www.php.net/manual/en/class.dateinterval.php
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$interval = $d1->diff($d2);
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return $interval;
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}
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public function depreciated_date()
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{
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$date = date_create($this->purchase_date);
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date_add($date, date_interval_create_from_date_string($this->depreciation->months . ' months'));
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return $date; //date_format($date, 'Y-m-d'); //don't bake-in format, for internationalization
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}
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} |