Php arrays are merged based on categories. In php, there are many ways to merge arrays in a simple way, but today I want to merge arrays based on the array ID and then re-merge the arrays based on categories. In php, there are many ways to merge arrays in the simplest way. but today I want to merge arrays again based on the array ID, which is to be operated by category.
To merge the simplest arrays, we only need to use array_merge.
Array_merge () combines two or more arrays. the values in an array are appended to the values of the previous array. Returns an array of results.
When the array KEY name is a numeric KEY, when the two arrays to be merged have a numeric KEY with the same name, using array_merge () will not overwrite the original value, when "+" is used to merge arrays, the first value will be returned as the final result, and the values of the following arrays with the same key name will be discarded (note: instead of overwriting, the value that appears first is retained ). Example:
| The code is as follows: |
|
$ Array1 = array (1 => '0 ');
$ Array2 = array (1 => "data ");
$ Result1 = $ array2 + $ array1;/* The result is a value of $ array2 */
Print_r ($ result );
$ Result = $ array1 + $ array2;/* The result is a value of $ array1 */
Print_r ($ result );
$ Result3 = array_merge ($ array2, $ array1);/* The result is the value of $ array2 and $ array1, and the key name is reassigned */
Print_r ($ result3 );
$ Result4 = array_merge ($ array1, $ array2);/* The result is $ array1 and $ array2, and the key name is reassigned */
Print_r ($ result4 ); Output result:
Array ([1] => data)
Array ([1] => 0)
Array (
[0] => data
[1] => 0
)
Array
(
[0] => 0
[1] => data
) |
2. when the same array key name is a character, the "+" operator is the same as the key name is a number, but array_merge () will overwrite the value of the previous same key name.
Example:
| The code is as follows: |
|
$ Array1 = array ('asd '=> '0 ');
$ Array2 = array ('asd '=> "data ");
$ Result1 = $ array2 + $ array1;/* The result is a value of $ array2 */
Print_r ($ result );
$ Result = $ array1 + $ array2;/* The result is a value of $ array1 */
Print_r ($ result );
$ Result3 = array_merge ($ array2, $ array1);/* The result is $ array1 */
Print_r ($ result3 );
$ Result4 = array_merge ($ array1, $ array2);/* The result is $ array2 */
Print_r ($ result4 );
Output result:
Array ([asd] => data)
Array ([asd] => 0)
Array ([asd] => 0)
Array ([asd] => data) |
After talking so much, the following is what I want to introduce to you.
Example.
Array reorganization based on classification fields
| The code is as follows: |
|
// Array to be reorganized
$ Arrar = array ();
$ Array [] = array ('itemid' => 110126866896, 'categoryid' => 111 );
$ Array [] = array ('itemid' => 120126866896, 'categoryid' => 112 );
$ Array [] = array ('itemid' => 130126866896, 'categoryid' => 113 );
$ Array [] = array ('itemid' => 140126866896, 'categoryid' => 114 );
$ Array [] = array ('itemid' => 150126866896, 'categoryid' => 115 );
$ Array [] = array ('itemid' => 160126866896, 'categoryid' => 116 );
$ Array [] = array ('itemid' => 170126866896, 'categoryid' => 117 );
$ Array [] = array ('itemid' => 118126866896, 'categoryid' => 111 );
$ Array [] = array ('itemid' => 121126866896, 'categoryid' => 112 );
$ Array [] = array ('itemid' => 132126866896, 'categoryid' => 113 );
$ Array [] = array ('itemid' => 143126866896, 'categoryid' => 114 );
$ Array [] = array ('itemid' => 154126866896, 'categoryid' => 115 );
$ Array [] = array ('itemid' => 165126866896, 'categoryid' => 116 );
$ Array [] = array ('itemid' => 176126866896, 'categoryid' => 117 );
// Array is reorganized by category
$ NewArray = array ();
Foreach ($ array as $ val ){
$ NewArray [$ val ['categoryid'] [] = $ val;
}
// Delete the original array to release Space
$ Array = null;
Unset ($ array );
Print_r ($ newArray );
?>
|
Bytes. The simplest array merge me...
