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                #### 將一個二維數組按照指定字段的值分組 **代碼:** ~~~ function groupBy($arr, $key_field) { $ret = array (); foreach ( $arr as $row ) { $key = $row [$key_field]; $ret [$key] [] = $row; } return $ret; } ~~~ **調用:** ~~~ $rows = array( * array('id' => 1, 'value' => '1-1', 'parent' => 1), * array('id' => 2, 'value' => '2-1', 'parent' => 1), * array('id' => 3, 'value' => '3-1', 'parent' => 1), * array('id' => 4, 'value' => '4-1', 'parent' => 2), * array('id' => 5, 'value' => '5-1', 'parent' => 2), * array('id' => 6, 'value' => '6-1', 'parent' => 3), * ); * $values = Helper_Array::groupBy($rows, 'parent'); * * dump($values); * // 按照 parent 分組的輸出結果為 * // array( * // 1 => array( * // array('id' => 1, 'value' => '1-1', 'parent' => 1), * // array('id' => 2, 'value' => '2-1', 'parent' => 1), * // array('id' => 3, 'value' => '3-1', 'parent' => 1), * // ), * // 2 => array( * // array('id' => 4, 'value' => '4-1', 'parent' => 2), * // array('id' => 5, 'value' => '5-1', 'parent' => 2), * // ), * // 3 => array( * // array('id' => 6, 'value' => '6-1', 'parent' => 3), * // ), * // ) ~~~
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