1 | <?php |
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5 | abstract class Comparer { |
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6 | |||
7 | /** |
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8 | * Supported comparison signs |
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9 | * |
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10 | * @var array<string> |
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11 | */ |
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12 | protected $supported_comparison_operators = array(); |
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13 | |||
14 | /** |
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15 | * Check if comparer supports the specified comparison sign |
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16 | * |
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17 | * @param string $comparison_operator |
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18 | * @return bool |
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19 | */ |
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20 | public function supports_comparison_operator( $comparison_operator ) { |
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21 | return in_array( $comparison_operator, $this->supported_comparison_operators ); |
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22 | } |
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23 | |||
24 | /** |
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25 | * Check if comparison is true for $a and $b |
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26 | * |
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27 | * @param mixed $a |
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28 | * @param string $comparison_operator |
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29 | * @param mixed $b |
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30 | * @return bool |
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31 | */ |
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32 | abstract public function is_correct( $a, $comparison_operator, $b ); |
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33 | } |