Tutorial on array operation class _ PHP

Array operation class. RemoveEmpty (, (: removeEmpty ([([] getCols (, ([] [toHashmap (,, ([[] [([] groupBy (, ([] [] toTree (,,

RemoveEmpty (&, = (=> (: removeEmpty ([= (= ''([] = 1, 'value' => '1-1'), * array ('id' => 2, 'value' => '2-1 '),*); * $ values = ArrayHelper: getCols ($ rows, 'value'); ** dump ($ values ); * // The output result is * // array (* // '1-1', * // '2-1 ',*//) * @ endcode ** @ param array $ arr data source * @ param string $ col the key to be queried ** @ return array contains the array getCols (, = ([[] = [1, 'value' => '1-1'), * array ('id' => 2, 'value' => '2-1'), *); * $ hashmap = ArrayHelper: toHashmap ($ rows, 'id', 'value '); ** dump ($ hashmap); * // The output result is * // array (* // 1 => '1-1 ', * // 2 => '2-1', * //) * @ endcode ** if the $ valueField parameter is omitted, each item in the conversion result is an array containing all the data of the item. ** Usage 2: * @ code php * $ rows = array (* array ('id' => 1, 'value' => '1-1 '), * array ('id' => 2, 'value' => '2-1'), *); * $ hashmap = ArrayHelper: toHashmap ($ rows, 'id'); ** dump ($ hashmap); * // The output result is * // array (* // 1 => array ('id' => 1, 'value' => '1-1'), * // 2 => array ('id' => 2, 'value' => '2-1 '), * //) * @ endcode ** @ param array $ arr data source * @ param string $ the key value of keyField for conversion * @ param strin Key value of g $ valueField ** @ return array the converted HashMap style array toHashmap (, = ([] = [([] = 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 = ArrayHelper: groupBy ($ rows, 'parent'); ** dump ($ values ); * // The output result is * // 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, 'VA Lue '=> '5-1', 'parent' => 2 ),*//), * // 3 => array (* // array ('id' => 6, 'value' => '6-1', 'parent' => 3 ), *//),*//) * @ endcode ** @ param array $ arr data source * @ param string $ keyField is the key name for the group. ** @ return array: the result of the group groupBy (, = (= [[] [] = 1, 'value' => '1-1', 'parent' => 0), * array ('id' => 2, 'value' => '2-1', 'parent' => 0), * array ('id' => 3, 'value' => '3-1 ', 'parent' => 0), ** arra Y ('id' => 7, 'value' => '2-1-1 ', 'parent' => 2), * array ('id' => 8, 'value' => '2-1-2 ', 'parent' => 2), * array ('id' => 9, 'value' => '3-1-1 ', 'parent' => 3), * array ('id' => 10, 'value' => '3-1-1-1 ', 'parent' => 9 ),*); ** $ tree = ArrayHelper: tree ($ rows, 'id', 'parent', 'nodes '); ** dump ($ tree ); * // The output result is: * // array ('id' => 1 ,..., 'nodes '=> array (), * // array ('id' => 2 ,..., 'Nodes '=> array (* // array (..., 'parent' => 2, 'nodes '=> array (), * // array (..., 'parent' => 2, 'nodes '=> array (), * //), * // array ('id' => 3 ,..., 'nodes '=> array (* // array ('id' => 9 ,..., 'parent' => 3, 'nodes '=> array (* // array (...,, 'parent' => 9, 'nodes '=> array (),*//),*//),*//) * @ endcode ** to obtain the subtree with any node as the root, you can use the $ refs parameter: * @ code php * $ refs = null; * $ tree = Array Helper: tree ($ rows, 'id', 'parent', 'nodes ', $ refs ); ** // The node whose output id is 3 and all its subnodes ** $ id = 3; * dump ($ refs [$ id]); * @ endcode ** @ param array $ arr data source * @ param string $ keyNodeId node ID field name * @ param string $ keyParentId node parent ID field name * @ param string $ keyChildrens field name * @ param boolean $ whether refs contains a node reference in the returned result ** return array toTree (,, = 'parent _ id', = 'childrens', & == (=> [] [] = [] = & [= (=> = [((! ([[] = & [= & [] [] = & [[] = & [TreeToArray (, = 'childrens' = ([]) & ([[] = (, self: treeToArray (, ([] = [] = 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 ),*); ** $ rows = ArrayHelper: sortByCol ($ rows, 'id', SORT_DESC); * dump ($ rows); * // The output result is: * // array ('id' => 6, 'value' => '6-1', 'parent' => 3 ), * // array ('id' => 5, 'value' => '5-1', 'parent' => 2 ), * // array ('id' => 4, 'value' => '4-1', 'parent' => 2 ), * // array ('id' => 3, 'value' => '3-1', 'parent' => 1 ), * // array ('id' => 2, 'value' => '2-1', 'parent' => 1 ), * // array ('id' => 1, 'value' => '1-1', 'parent' => 1 ),*//) * @ endcode ** @ param array $ array the array to be sorted * @ param string $ keyname the sort key * @ param int $ dir sort direction ** @ return array the sorted array sortByCol (,, = self: sortByMultiCols (, (=> SORT_ASC, * 'name' => SORT_DESC ,*)); * @ endcode ** @ param array $ array to be sorted * @ param array $ args sort key ** @ return array sortByMultiCols (, = ''(=> [] [] = [. = '$ sortArray [\''.. 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