Classic examples of PHP code optimization

The method I used was to separate the blocks by key, then to assign the block to other variables, and then do some action, which used a lot of for and foreach, and the amount of code is very large, so it was returned.

Through the above guidance, found really good simple, and now share 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, as the result shows,

Requirement: To operate on an array that has been sorted by key, the same key is processed.

Hint: This is a very typical structure of mother-child table, that is to say, it is a combination of two tables, which can be processed into two arrays to facilitate the operation of the block in the array.
Array1:idkey

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)

	Id	FIELD1	FIELD2	FIELD3	FIELD4	Key
Meat1=>	1	***	***	***	***	Meat1
	2	***	***	***	***	Meat1
	3	***	***	***	***	Meat1
	4	***	***	***	***	Meat1
Fruit2=>	5	***	***	***	***	Fruit2
	6	***	***	***	***	Fruit2
	7	***	***	***	***	Fruit2
	8	***	***	***	***	Fruit2
	9	***	***	***	***	Fruit2
Food3=>	10	***	***	***	***	Food3
	11	***	***	***	***	Food3

Implementing an array-separated code like above

After that, it's very convenient to access the Temparray block data.

foreach ($tempArray as $row) {

array1[$row [' ID ']] = $row [' Key '];

array2[$row [' Key ']][] = $row;

}

Accessing and processing code

foreach ($array 1 as $ID => $Key) {

$this->dosomething ($ID);

Accessing the Temparray block array $array2[$Key]

$this->dosomething2 ($array 2[$Key]);

}