A classic example of PHP code optimization _php Tutorial

I used the method of distinguishing blocks by key, then assigning the block to other variables, and then doing some work, so I used a lot of for and foreach, and the code was very large, so I was back.

After 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 the result is as shown above

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

Hint: This is a very typical parent-child table structure, that is to say, it is a combination of two tables, can be processed into two arrays, convenient array in the face of the operation of the block
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)

	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 separation code like above

After that, it is very convenient to access the block data of the Temparray.

foreach ($tempArray as $row) {

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

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

}

Accessing and handling code

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

$this->dosomething ($ID);

　　Access Temparray block array $array2[$Key]

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

}

http://www.bkjia.com/PHPjc/323010.html www.bkjia.com true http://www.bkjia.com/PHPjc/323010.html techarticle the way I use it is to distinguish blocks by key, and then to assign the blocks to other variables, and then perform some operations, so that a lot of for and foreach are used, and the amount of code is very large, so it's back ...

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