In PHP if it is a simple number combination and there are many methods, but I asked today to be based on the array ID and then re-merge the array, is to be based on the classification to operate.
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:
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| $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;/* result is $array1 value */
Print_r ($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:
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$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;/* result is $array1 value */
Print_r ($result);
$result 3 = Array_merge ($array 2, $array 1);/* The result is $array1*/
Print_r ($result 3);
$result 4 = Array_merge ($array 1, $array 2);/* The 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.
Cases.
Array reorganization based on categorical fields
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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);
?>
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