| 1 | <?php |
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| 7 | class Volume extends Quantity { |
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| 8 | |||
| 9 | // The base unit for the `$units` conversion table |
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| 10 | const BASE_UNIT = 'l'; // liter |
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| 11 | |||
| 12 | // New objects will convert to this unit |
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| 13 | static public $default_unit = self::BASE_UNIT; |
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| 14 | |||
| 15 | // Conversion table for this Quantity |
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| 16 | static public $units = array( |
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| 17 | 'l' => 1, // base |
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| 18 | 'usg' => 3.78541, |
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| 19 | 'bg' => 4.54609, |
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| 20 | ); |
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| 21 | |||
| 22 | /** |
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| 23 | * The convertor heart, that every sub class needs |
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| 24 | */ |
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| 25 | protected function convertor( $toUnit ) { |
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| 28 | |||
| 29 | } |
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| 30 |