The simplest array merge we just use Array_merge to
Array_merge () Merges the cells of two or more arrays, and the values in one array are appended to the previous array. Returns an array as the result.
When the array key name is a numeric key name, the two arrays to be merged have the same name as the number key, using Array_merge () will not overwrite the original value, while using "+" to merge the array will return the first occurrence as the final result, and the values of the following array with the same key name "Discard" (note: Instead of overwriting, it retains the first value that appears). Example:
Copy CodeThe code is as follows:
$array 1 = array (1=> ' 0 ');
$array 2 = Array (1=> "data");
$result 1 = $array 2 + $array 1;/* result is the value of $array2 */
Print_r ($result);
$result = $array 1 + $array 2;/* The result is a value of $array1 */
Print_r ($result);
$result 3 = Array_merge ($array 2, $array 1);/* The result is a value of $array2 and $array1, and the key name is reassigned */
Print_r ($result 3);
$result 4 = Array_merge ($array 1, $array 2);/* The result is a value of $array1 and $array2, and the key name is reassigned */
Print_r ($result 4);
The output is:
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, but Array_merge () overrides the previous value of the same key name.
Example:
Copy CodeThe code is as follows:
$array 1 = Array (' asd ' = ' 0 ');
$array 2 = Array (' ASD ' = ' data ');
$result 1 = $array 2 + $array 1;/* result is the value of $array2 */
Print_r ($result);
$result = $array 1 + $array 2;/* The result is a value of $array1 */
Print_r ($result);
$result 3 = Array_merge ($array 2, $array 1);/* result is $array1*/
Print_r ($result 3);
$result 4 = Array_merge ($array 1, $array 2);/* result is $array2*/
Print_r ($result 4);
The output is:
Array ([ASD] = data)
Array ([ASD] = 0)
Array ([ASD] = 0)
Array ([ASD] = data)
With so many crap, here's what I'm going to tell you guys.
Array reorganization based on categorical fields
Copy CodeThe code is as follows:
Arrays that need 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);
Arrays are reorganized according to classification
$newArray =array ();
foreach ($array as $val) {
$newArray [$val [' CategoryID ']][]= $val;
}
Delete original array free space
$array =null;
Unset ($array);
Print_r ($newArray);
?>
http://www.bkjia.com/PHPjc/825097.html www.bkjia.com true http://www.bkjia.com/PHPjc/825097.html techarticle simplest array Merging we can Array_merge () combine two or more arrays of cells by using Array_merge, and the values in an array are appended to the previous array. Return to ...
