PHPOffice /
PhpSpreadsheet
Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like Database often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Database, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 7 | class Database |
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| 8 | { |
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| 9 | /** |
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| 10 | * fieldExtract. |
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| 11 | * |
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| 12 | * Extracts the column ID to use for the data field. |
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| 13 | * |
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| 14 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 15 | * A database is a list of related data in which rows of related |
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| 16 | * information are records, and columns of data are fields. The |
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| 17 | * first row of the list contains labels for each column. |
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| 18 | * @param mixed $field Indicates which column is used in the function. Enter the |
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| 19 | * column label enclosed between double quotation marks, such as |
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| 20 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 21 | * represents the position of the column within the list: 1 for |
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| 22 | * the first column, 2 for the second column, and so on. |
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| 23 | * |
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| 24 | * @return null|string |
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| 25 | */ |
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| 26 | 10 | private static function fieldExtract($database, $field) |
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| 27 | { |
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| 28 | 10 | $field = strtoupper(Functions::flattenSingleValue($field)); |
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| 29 | 10 | $fieldNames = array_map('strtoupper', array_shift($database)); |
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| 30 | |||
| 31 | 10 | if (is_numeric($field)) { |
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| 32 | 8 | $keys = array_keys($fieldNames); |
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| 33 | |||
| 34 | 8 | return $keys[$field - 1]; |
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| 35 | } |
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| 36 | 10 | $key = array_search($field, $fieldNames); |
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| 37 | |||
| 38 | 10 | return ($key) ? $key : null; |
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| 39 | } |
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| 40 | |||
| 41 | /** |
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| 42 | * filter. |
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| 43 | * |
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| 44 | * Parses the selection criteria, extracts the database rows that match those criteria, and |
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| 45 | * returns that subset of rows. |
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| 46 | * |
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| 47 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 48 | * A database is a list of related data in which rows of related |
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| 49 | * information are records, and columns of data are fields. The |
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| 50 | * first row of the list contains labels for each column. |
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| 51 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 52 | * You can use any range for the criteria argument, as long as it |
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| 53 | * includes at least one column label and at least one cell below |
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| 54 | * the column label in which you specify a condition for the |
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| 55 | * column. |
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| 56 | * |
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| 57 | * @return array of mixed |
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| 58 | */ |
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| 59 | 10 | private static function filter($database, $criteria) |
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| 60 | { |
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| 61 | 10 | $fieldNames = array_shift($database); |
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| 62 | 10 | $criteriaNames = array_shift($criteria); |
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| 63 | |||
| 64 | // Convert the criteria into a set of AND/OR conditions with [:placeholders] |
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| 65 | 10 | $testConditions = $testValues = []; |
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| 66 | 10 | $testConditionsCount = 0; |
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| 67 | 10 | foreach ($criteriaNames as $key => $criteriaName) { |
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| 68 | 10 | $testCondition = []; |
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| 69 | 10 | $testConditionCount = 0; |
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| 70 | 10 | foreach ($criteria as $row => $criterion) { |
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| 71 | 10 | if ($criterion[$key] > '') { |
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| 72 | 10 | $testCondition[] = '[:' . $criteriaName . ']' . Functions::ifCondition($criterion[$key]); |
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| 73 | 10 | ++$testConditionCount; |
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| 74 | } |
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| 75 | } |
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| 76 | 10 | if ($testConditionCount > 1) { |
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| 77 | 8 | $testConditions[] = 'OR(' . implode(',', $testCondition) . ')'; |
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| 78 | 8 | ++$testConditionsCount; |
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| 79 | 6 | } elseif ($testConditionCount == 1) { |
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| 80 | 6 | $testConditions[] = $testCondition[0]; |
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| 81 | 10 | ++$testConditionsCount; |
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| 82 | } |
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| 83 | } |
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| 84 | |||
| 85 | 10 | if ($testConditionsCount > 1) { |
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| 86 | 6 | $testConditionSet = 'AND(' . implode(',', $testConditions) . ')'; |
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| 87 | 8 | } elseif ($testConditionsCount == 1) { |
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| 88 | 8 | $testConditionSet = $testConditions[0]; |
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| 89 | } |
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| 90 | |||
| 91 | // Loop through each row of the database |
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| 92 | 10 | foreach ($database as $dataRow => $dataValues) { |
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| 93 | // Substitute actual values from the database row for our [:placeholders] |
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| 94 | 10 | $testConditionList = $testConditionSet; |
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| 95 | 10 | foreach ($criteriaNames as $key => $criteriaName) { |
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| 96 | 10 | $k = array_search($criteriaName, $fieldNames); |
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| 97 | 10 | if (isset($dataValues[$k])) { |
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| 98 | 10 | $dataValue = $dataValues[$k]; |
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| 99 | 10 | $dataValue = (is_string($dataValue)) ? Calculation::wrapResult(strtoupper($dataValue)) : $dataValue; |
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| 100 | 10 | $testConditionList = str_replace('[:' . $criteriaName . ']', $dataValue, $testConditionList); |
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| 101 | } |
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| 102 | } |
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| 103 | // evaluate the criteria against the row data |
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| 104 | 10 | $result = Calculation::getInstance()->_calculateFormulaValue('=' . $testConditionList); |
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| 105 | // If the row failed to meet the criteria, remove it from the database |
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| 106 | 10 | if (!$result) { |
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| 107 | 10 | unset($database[$dataRow]); |
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| 108 | } |
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| 109 | } |
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| 110 | |||
| 111 | 10 | return $database; |
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| 112 | } |
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| 113 | |||
| 114 | 10 | private static function getFilteredColumn($database, $field, $criteria) |
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| 115 | { |
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| 116 | // reduce the database to a set of rows that match all the criteria |
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| 117 | 10 | $database = self::filter($database, $criteria); |
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| 118 | // extract an array of values for the requested column |
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| 119 | 10 | $colData = []; |
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| 120 | 10 | foreach ($database as $row) { |
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| 121 | 10 | $colData[] = $row[$field]; |
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| 122 | } |
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| 123 | |||
| 124 | 10 | return $colData; |
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| 125 | } |
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| 126 | |||
| 127 | /** |
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| 128 | * DAVERAGE. |
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| 129 | * |
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| 130 | * Averages the values in a column of a list or database that match conditions you specify. |
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| 131 | * |
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| 132 | * Excel Function: |
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| 133 | * DAVERAGE(database,field,criteria) |
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| 134 | * |
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| 135 | * @category Database Functions |
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| 136 | * |
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| 137 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 138 | * A database is a list of related data in which rows of related |
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| 139 | * information are records, and columns of data are fields. The |
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| 140 | * first row of the list contains labels for each column. |
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| 141 | * @param int|string $field Indicates which column is used in the function. Enter the |
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| 142 | * column label enclosed between double quotation marks, such as |
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| 143 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 144 | * represents the position of the column within the list: 1 for |
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| 145 | * the first column, 2 for the second column, and so on. |
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| 146 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 147 | * You can use any range for the criteria argument, as long as it |
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| 148 | * includes at least one column label and at least one cell below |
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| 149 | * the column label in which you specify a condition for the |
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| 150 | * column. |
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| 151 | * |
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| 152 | * @return float |
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| 153 | */ |
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| 154 | 1 | View Code Duplication | public static function DAVERAGE($database, $field, $criteria) |
| 155 | { |
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| 156 | 1 | $field = self::fieldExtract($database, $field); |
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| 157 | 1 | if ($field === null) { |
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| 158 | return null; |
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| 159 | } |
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| 160 | |||
| 161 | // Return |
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| 162 | 1 | return Statistical::AVERAGE( |
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| 163 | 1 | self::getFilteredColumn($database, $field, $criteria) |
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| 164 | ); |
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| 165 | } |
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| 166 | |||
| 167 | /** |
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| 168 | * DCOUNT. |
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| 169 | * |
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| 170 | * Counts the cells that contain numbers in a column of a list or database that match conditions |
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| 171 | * that you specify. |
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| 172 | * |
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| 173 | * Excel Function: |
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| 174 | * DCOUNT(database,[field],criteria) |
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| 175 | * |
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| 176 | * Excel Function: |
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| 177 | * DAVERAGE(database,field,criteria) |
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| 178 | * |
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| 179 | * @category Database Functions |
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| 180 | * |
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| 181 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 182 | * A database is a list of related data in which rows of related |
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| 183 | * information are records, and columns of data are fields. The |
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| 184 | * first row of the list contains labels for each column. |
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| 185 | * @param int|string $field Indicates which column is used in the function. Enter the |
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| 186 | * column label enclosed between double quotation marks, such as |
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| 187 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 188 | * represents the position of the column within the list: 1 for |
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| 189 | * the first column, 2 for the second column, and so on. |
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| 190 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 191 | * You can use any range for the criteria argument, as long as it |
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| 192 | * includes at least one column label and at least one cell below |
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| 193 | * the column label in which you specify a condition for the |
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| 194 | * column. |
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| 195 | * |
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| 196 | * @return int |
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| 197 | * |
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| 198 | * @TODO The field argument is optional. If field is omitted, DCOUNT counts all records in the |
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| 199 | * database that match the criteria. |
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| 200 | */ |
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| 201 | 1 | View Code Duplication | public static function DCOUNT($database, $field, $criteria) |
| 202 | { |
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| 203 | 1 | $field = self::fieldExtract($database, $field); |
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| 204 | 1 | if ($field === null) { |
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| 205 | return null; |
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| 206 | } |
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| 207 | |||
| 208 | // Return |
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| 209 | 1 | return Statistical::COUNT( |
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| 210 | 1 | self::getFilteredColumn($database, $field, $criteria) |
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| 211 | ); |
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| 212 | } |
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| 213 | |||
| 214 | /** |
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| 215 | * DCOUNTA. |
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| 216 | * |
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| 217 | * Counts the nonblank cells in a column of a list or database that match conditions that you specify. |
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| 218 | * |
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| 219 | * Excel Function: |
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| 220 | * DCOUNTA(database,[field],criteria) |
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| 221 | * |
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| 222 | * @category Database Functions |
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| 223 | * |
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| 224 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 225 | * A database is a list of related data in which rows of related |
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| 226 | * information are records, and columns of data are fields. The |
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| 227 | * first row of the list contains labels for each column. |
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| 228 | * @param int|string $field Indicates which column is used in the function. Enter the |
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| 229 | * column label enclosed between double quotation marks, such as |
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| 230 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 231 | * represents the position of the column within the list: 1 for |
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| 232 | * the first column, 2 for the second column, and so on. |
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| 233 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 234 | * You can use any range for the criteria argument, as long as it |
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| 235 | * includes at least one column label and at least one cell below |
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| 236 | * the column label in which you specify a condition for the |
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| 237 | * column. |
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| 238 | * |
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| 239 | * @return int |
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| 240 | * |
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| 241 | * @TODO The field argument is optional. If field is omitted, DCOUNTA counts all records in the |
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| 242 | * database that match the criteria. |
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| 243 | */ |
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| 244 | public static function DCOUNTA($database, $field, $criteria) |
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| 264 | |||
| 265 | /** |
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| 266 | * DGET. |
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| 267 | * |
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| 268 | * Extracts a single value from a column of a list or database that matches conditions that you |
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| 269 | * specify. |
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| 270 | * |
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| 271 | * Excel Function: |
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| 272 | * DGET(database,field,criteria) |
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| 273 | * |
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| 274 | * @category Database Functions |
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| 275 | * |
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| 276 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 277 | * A database is a list of related data in which rows of related |
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| 278 | * information are records, and columns of data are fields. The |
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| 279 | * first row of the list contains labels for each column. |
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| 280 | * @param int|string $field Indicates which column is used in the function. Enter the |
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| 281 | * column label enclosed between double quotation marks, such as |
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| 282 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 283 | * represents the position of the column within the list: 1 for |
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| 284 | * the first column, 2 for the second column, and so on. |
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| 285 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 286 | * You can use any range for the criteria argument, as long as it |
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| 287 | * includes at least one column label and at least one cell below |
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| 288 | * the column label in which you specify a condition for the |
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| 289 | * column. |
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| 290 | * |
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| 291 | * @return mixed |
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| 292 | */ |
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| 293 | 1 | public static function DGET($database, $field, $criteria) |
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| 294 | { |
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| 295 | 1 | $field = self::fieldExtract($database, $field); |
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| 296 | 1 | if ($field === null) { |
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| 297 | return null; |
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| 298 | } |
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| 299 | |||
| 300 | // Return |
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| 301 | 1 | $colData = self::getFilteredColumn($database, $field, $criteria); |
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| 302 | 1 | if (count($colData) > 1) { |
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| 303 | return Functions::NAN(); |
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| 304 | } |
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| 305 | |||
| 306 | 1 | return $colData[0]; |
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| 307 | } |
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| 308 | |||
| 309 | /** |
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| 310 | * DMAX. |
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| 311 | * |
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| 312 | * Returns the largest number in a column of a list or database that matches conditions you that |
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| 313 | * specify. |
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| 314 | * |
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| 315 | * Excel Function: |
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| 316 | * DMAX(database,field,criteria) |
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| 317 | * |
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| 318 | * @category Database Functions |
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| 319 | * |
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| 320 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 321 | * A database is a list of related data in which rows of related |
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| 322 | * information are records, and columns of data are fields. The |
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| 323 | * first row of the list contains labels for each column. |
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| 324 | * @param int|string $field Indicates which column is used in the function. Enter the |
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| 325 | * column label enclosed between double quotation marks, such as |
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| 326 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 327 | * represents the position of the column within the list: 1 for |
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| 328 | * the first column, 2 for the second column, and so on. |
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| 329 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 330 | * You can use any range for the criteria argument, as long as it |
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| 331 | * includes at least one column label and at least one cell below |
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| 332 | * the column label in which you specify a condition for the |
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| 333 | * column. |
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| 334 | * |
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| 335 | * @return float |
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| 336 | */ |
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| 337 | 1 | View Code Duplication | public static function DMAX($database, $field, $criteria) |
| 338 | { |
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| 339 | 1 | $field = self::fieldExtract($database, $field); |
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| 340 | 1 | if ($field === null) { |
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| 341 | return null; |
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| 342 | } |
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| 343 | |||
| 344 | // Return |
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| 345 | 1 | return Statistical::MAX( |
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| 346 | 1 | self::getFilteredColumn($database, $field, $criteria) |
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| 347 | ); |
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| 348 | } |
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| 349 | |||
| 350 | /** |
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| 351 | * DMIN. |
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| 352 | * |
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| 353 | * Returns the smallest number in a column of a list or database that matches conditions you that |
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| 354 | * specify. |
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| 355 | * |
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| 356 | * Excel Function: |
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| 357 | * DMIN(database,field,criteria) |
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| 358 | * |
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| 359 | * @category Database Functions |
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| 360 | * |
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| 361 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 362 | * A database is a list of related data in which rows of related |
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| 363 | * information are records, and columns of data are fields. The |
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| 364 | * first row of the list contains labels for each column. |
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| 365 | * @param int|string $field Indicates which column is used in the function. Enter the |
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| 366 | * column label enclosed between double quotation marks, such as |
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| 367 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 368 | * represents the position of the column within the list: 1 for |
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| 369 | * the first column, 2 for the second column, and so on. |
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| 370 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 371 | * You can use any range for the criteria argument, as long as it |
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| 372 | * includes at least one column label and at least one cell below |
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| 373 | * the column label in which you specify a condition for the |
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| 374 | * column. |
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| 375 | * |
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| 376 | * @return float |
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| 377 | */ |
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| 378 | 1 | View Code Duplication | public static function DMIN($database, $field, $criteria) |
| 379 | { |
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| 380 | 1 | $field = self::fieldExtract($database, $field); |
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| 381 | 1 | if ($field === null) { |
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| 382 | return null; |
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| 383 | } |
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| 384 | |||
| 385 | // Return |
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| 386 | 1 | return Statistical::MIN( |
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| 387 | 1 | self::getFilteredColumn($database, $field, $criteria) |
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| 388 | ); |
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| 389 | } |
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| 390 | |||
| 391 | /** |
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| 392 | * DPRODUCT. |
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| 393 | * |
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| 394 | * Multiplies the values in a column of a list or database that match conditions that you specify. |
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| 395 | * |
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| 396 | * Excel Function: |
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| 397 | * DPRODUCT(database,field,criteria) |
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| 398 | * |
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| 399 | * @category Database Functions |
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| 400 | * |
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| 401 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 402 | * A database is a list of related data in which rows of related |
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| 403 | * information are records, and columns of data are fields. The |
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| 404 | * first row of the list contains labels for each column. |
||
| 405 | * @param int|string $field Indicates which column is used in the function. Enter the |
||
| 406 | * column label enclosed between double quotation marks, such as |
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| 407 | * "Age" or "Yield," or a number (without quotation marks) that |
||
| 408 | * represents the position of the column within the list: 1 for |
||
| 409 | * the first column, 2 for the second column, and so on. |
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| 410 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 411 | * You can use any range for the criteria argument, as long as it |
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| 412 | * includes at least one column label and at least one cell below |
||
| 413 | * the column label in which you specify a condition for the |
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| 414 | * column. |
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| 415 | * |
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| 416 | * @return float |
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| 417 | */ |
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| 418 | 1 | View Code Duplication | public static function DPRODUCT($database, $field, $criteria) |
| 419 | { |
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| 420 | 1 | $field = self::fieldExtract($database, $field); |
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| 421 | 1 | if ($field === null) { |
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| 422 | return null; |
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| 423 | } |
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| 424 | |||
| 425 | // Return |
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| 426 | 1 | return MathTrig::PRODUCT( |
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| 427 | 1 | self::getFilteredColumn($database, $field, $criteria) |
|
| 428 | ); |
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| 429 | } |
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| 430 | |||
| 431 | /** |
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| 432 | * DSTDEV. |
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| 433 | * |
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| 434 | * Estimates the standard deviation of a population based on a sample by using the numbers in a |
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| 435 | * column of a list or database that match conditions that you specify. |
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| 436 | * |
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| 437 | * Excel Function: |
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| 438 | * DSTDEV(database,field,criteria) |
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| 439 | * |
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| 440 | * @category Database Functions |
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| 441 | * |
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| 442 | * @param mixed[] $database The range of cells that makes up the list or database. |
||
| 443 | * A database is a list of related data in which rows of related |
||
| 444 | * information are records, and columns of data are fields. The |
||
| 445 | * first row of the list contains labels for each column. |
||
| 446 | * @param int|string $field Indicates which column is used in the function. Enter the |
||
| 447 | * column label enclosed between double quotation marks, such as |
||
| 448 | * "Age" or "Yield," or a number (without quotation marks) that |
||
| 449 | * represents the position of the column within the list: 1 for |
||
| 450 | * the first column, 2 for the second column, and so on. |
||
| 451 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
||
| 452 | * You can use any range for the criteria argument, as long as it |
||
| 453 | * includes at least one column label and at least one cell below |
||
| 454 | * the column label in which you specify a condition for the |
||
| 455 | * column. |
||
| 456 | * |
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| 457 | * @return float |
||
| 458 | */ |
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| 459 | 1 | View Code Duplication | public static function DSTDEV($database, $field, $criteria) |
| 460 | { |
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| 461 | 1 | $field = self::fieldExtract($database, $field); |
|
| 462 | 1 | if ($field === null) { |
|
| 463 | return null; |
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| 464 | } |
||
| 465 | |||
| 466 | // Return |
||
| 467 | 1 | return Statistical::STDEV( |
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| 468 | 1 | self::getFilteredColumn($database, $field, $criteria) |
|
| 469 | ); |
||
| 470 | } |
||
| 471 | |||
| 472 | /** |
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| 473 | * DSTDEVP. |
||
| 474 | * |
||
| 475 | * Calculates the standard deviation of a population based on the entire population by using the |
||
| 476 | * numbers in a column of a list or database that match conditions that you specify. |
||
| 477 | * |
||
| 478 | * Excel Function: |
||
| 479 | * DSTDEVP(database,field,criteria) |
||
| 480 | * |
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| 481 | * @category Database Functions |
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| 482 | * |
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| 483 | * @param mixed[] $database The range of cells that makes up the list or database. |
||
| 484 | * A database is a list of related data in which rows of related |
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| 485 | * information are records, and columns of data are fields. The |
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| 486 | * first row of the list contains labels for each column. |
||
| 487 | * @param int|string $field Indicates which column is used in the function. Enter the |
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| 488 | * column label enclosed between double quotation marks, such as |
||
| 489 | * "Age" or "Yield," or a number (without quotation marks) that |
||
| 490 | * represents the position of the column within the list: 1 for |
||
| 491 | * the first column, 2 for the second column, and so on. |
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| 492 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
||
| 493 | * You can use any range for the criteria argument, as long as it |
||
| 494 | * includes at least one column label and at least one cell below |
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| 495 | * the column label in which you specify a condition for the |
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| 496 | * column. |
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| 497 | * |
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| 498 | * @return float |
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| 499 | */ |
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| 500 | 1 | View Code Duplication | public static function DSTDEVP($database, $field, $criteria) |
| 501 | { |
||
| 502 | 1 | $field = self::fieldExtract($database, $field); |
|
| 503 | 1 | if ($field === null) { |
|
| 504 | return null; |
||
| 505 | } |
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| 506 | |||
| 507 | // Return |
||
| 508 | 1 | return Statistical::STDEVP( |
|
| 509 | 1 | self::getFilteredColumn($database, $field, $criteria) |
|
| 510 | ); |
||
| 511 | } |
||
| 512 | |||
| 513 | /** |
||
| 514 | * DSUM. |
||
| 515 | * |
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| 516 | * Adds the numbers in a column of a list or database that match conditions that you specify. |
||
| 517 | * |
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| 518 | * Excel Function: |
||
| 519 | * DSUM(database,field,criteria) |
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| 520 | * |
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| 521 | * @category Database Functions |
||
| 522 | * |
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| 523 | * @param mixed[] $database The range of cells that makes up the list or database. |
||
| 524 | * A database is a list of related data in which rows of related |
||
| 525 | * information are records, and columns of data are fields. The |
||
| 526 | * first row of the list contains labels for each column. |
||
| 527 | * @param int|string $field Indicates which column is used in the function. Enter the |
||
| 528 | * column label enclosed between double quotation marks, such as |
||
| 529 | * "Age" or "Yield," or a number (without quotation marks) that |
||
| 530 | * represents the position of the column within the list: 1 for |
||
| 531 | * the first column, 2 for the second column, and so on. |
||
| 532 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
||
| 533 | * You can use any range for the criteria argument, as long as it |
||
| 534 | * includes at least one column label and at least one cell below |
||
| 535 | * the column label in which you specify a condition for the |
||
| 536 | * column. |
||
| 537 | * |
||
| 538 | * @return float |
||
| 539 | */ |
||
| 540 | View Code Duplication | public static function DSUM($database, $field, $criteria) |
|
| 552 | |||
| 553 | /** |
||
| 554 | * DVAR. |
||
| 555 | * |
||
| 556 | * Estimates the variance of a population based on a sample by using the numbers in a column |
||
| 557 | * of a list or database that match conditions that you specify. |
||
| 558 | * |
||
| 559 | * Excel Function: |
||
| 560 | * DVAR(database,field,criteria) |
||
| 561 | * |
||
| 562 | * @category Database Functions |
||
| 563 | * |
||
| 564 | * @param mixed[] $database The range of cells that makes up the list or database. |
||
| 565 | * A database is a list of related data in which rows of related |
||
| 566 | * information are records, and columns of data are fields. The |
||
| 567 | * first row of the list contains labels for each column. |
||
| 568 | * @param int|string $field Indicates which column is used in the function. Enter the |
||
| 569 | * column label enclosed between double quotation marks, such as |
||
| 570 | * "Age" or "Yield," or a number (without quotation marks) that |
||
| 571 | * represents the position of the column within the list: 1 for |
||
| 572 | * the first column, 2 for the second column, and so on. |
||
| 573 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
||
| 574 | * You can use any range for the criteria argument, as long as it |
||
| 575 | * includes at least one column label and at least one cell below |
||
| 576 | * the column label in which you specify a condition for the |
||
| 577 | * column. |
||
| 578 | * |
||
| 579 | * @return float |
||
| 580 | */ |
||
| 581 | 1 | View Code Duplication | public static function DVAR($database, $field, $criteria) |
| 582 | { |
||
| 583 | 1 | $field = self::fieldExtract($database, $field); |
|
| 584 | 1 | if ($field === null) { |
|
| 585 | return null; |
||
| 586 | } |
||
| 587 | |||
| 588 | // Return |
||
| 589 | 1 | return Statistical::VARFunc( |
|
| 590 | 1 | self::getFilteredColumn($database, $field, $criteria) |
|
| 591 | ); |
||
| 592 | } |
||
| 593 | |||
| 594 | /** |
||
| 595 | * DVARP. |
||
| 596 | * |
||
| 597 | * Calculates the variance of a population based on the entire population by using the numbers |
||
| 598 | * in a column of a list or database that match conditions that you specify. |
||
| 599 | * |
||
| 600 | * Excel Function: |
||
| 601 | * DVARP(database,field,criteria) |
||
| 602 | * |
||
| 603 | * @category Database Functions |
||
| 604 | * |
||
| 605 | * @param mixed[] $database The range of cells that makes up the list or database. |
||
| 606 | * A database is a list of related data in which rows of related |
||
| 607 | * information are records, and columns of data are fields. The |
||
| 608 | * first row of the list contains labels for each column. |
||
| 609 | * @param int|string $field Indicates which column is used in the function. Enter the |
||
| 610 | * column label enclosed between double quotation marks, such as |
||
| 611 | * "Age" or "Yield," or a number (without quotation marks) that |
||
| 612 | * represents the position of the column within the list: 1 for |
||
| 613 | * the first column, 2 for the second column, and so on. |
||
| 614 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
||
| 615 | * You can use any range for the criteria argument, as long as it |
||
| 616 | * includes at least one column label and at least one cell below |
||
| 617 | * the column label in which you specify a condition for the |
||
| 618 | * column. |
||
| 619 | * |
||
| 620 | * @return float |
||
| 621 | */ |
||
| 622 | 1 | View Code Duplication | public static function DVARP($database, $field, $criteria) |
| 634 | } |
||
| 635 |
Loading history...
This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.