Classic example of Windows XP hardware optimization PHP code optimization

The method I used was to distinguish blocks by key, then assign the blocks to other variables, and then perform some operations. This used a lot of for and foreach, and the amount of code was also large, so it was returned.
After the above guidance, I found that it is really simple, and now I will share it with you.

ID	FIELD1	FIELD2	FIELD3	FIELD4	Key
1	***	***	***	***	meat1
2	***	***	***	***	meat1
3	***	***	***	***	meat1
4	***	** *	***	***	meat1
5	***	***	***	***	fruit2
6	***	***	***	***	fruit2
7	***	***	***	***	fruit2
8	***	***	***	***	fruit2
9	***	***	***	***	fruit2
10	***	***	***	***	food3
11	***	***	***	***	food3

Now there is the result shown above

Requirement: To operate on this array that has been sorted by key, items with the same key for processing.

Tips: This is a very typical structure of a parent-child table, which means it is actually a merger of two tables. It can be processed into two arrays to facilitate block operations in the array
array1:ID|Key

ID	Key
1	meat1
2	meat1
3	meat1
4	meat1
5	fruit2
6	fruit2
7	fruit2
8	fruit2
9	fruit2
10	food3
11	food3

array2:key => array(ID,FIELD1,FIELD2,FIELD3,FIELD4,FIELD5,Key)

3************ meat14fruit2=>*** *********fruit26************fruit28******* *****fruit29************fruit2food3=>10***************food3************food3After this, it is very convenient to access the block data of tempArrayforeach($tempArray as $row){　array1[$row[' ID']] = $row['Key'];　array2[$row['Key']][] = $row;}Access and processing codeforeach($array1 as $ID = > Key]

	ID	FIELD1	FIELD2	FIELD3	FIELD4	Key
meat1=>	2	***	***	***	***	meat1
	***	***	***	***	meat1
5
	***	***	***	***	fruit2
7
	11
	Implement the above array separation code

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The above introduces the classic examples of Windows XP hardware optimization and PHP code optimization, including the content of Windows XP hardware optimization. I hope it will be helpful to friends who are interested in PHP tutorials.