PHP One-dimensional two-dimensional array key Sorting Method Example summary, two-dimensional array instance _php tutorial

PHP One-dimensional two-dimensional array key Sorting Method Example summary, two-dimensional array instances

This paper summarizes the key ordering method of PHP one-dimensional two-dimensional array. Share to everyone for your reference. Here's how:

Array sorting in PHP has always been a commonplace problem, let's focus on the implementation of a one-dimensional array and two-dimensional array ordering in PHP, I believe that we have some reference value.

Function: Reorder the array.

Description: Bubble sort (one-dimensional array) (a two-dimensional array of one health sort)

22 Compare the size of the data element to be sorted, and find that two data elements are exchanged in reverse order until there are no reversed data elements

Imagine that the sorted array R[1..N] is vertically erected, and each data element is treated as a bubble of weight, and the array is scanned from the bottom up, so that the light bubbles that violate the principle are scanned, causing it to "float" upward. So repeatedly. Until the last of any two gases are light on the top, the heavier is down.
Copy the Code code as follows:/**
* Bubble sort (one-dimensional array) (a two-dimensional array of one health sort)
* 22 Compare the size of the data element to be sorted, and find that two data elements are exchanged in reverse order until there are no reversed data elements
* Imagine a sorted array of R[1..N] vertically erected, each data element as a weight of bubbles, from the bottom of the scan array, where the principle of the scanning of light bubbles, so that it "floating upward." So repeated.
* Until the last of any two gases are light in the upper, the heavier is down.
*/
function Bubble_sort ($array, $key =null) {
$count = count ($array);
if ($count < 0) {
return false;
}
for ($i = 0; $i < $count; $i + +) {
for ($j = $count-1; $j > $i; $j-) {
if ($key && isset ($array [$key])) {//two-D array Jian exists
if ($array [$j] [$key] < $array [$j -1][$key]) {
$tmp = $array [$j];
$array [$j] = $array [$j-1];
$array [$j-1] = $tmp;
}
}else{//one-dimensional arrays
if ($array [$j] < $array [$j-1]) {
$tmp = $array [$j];
$array [$j] = $array [$j-1];
$array [$j-1] = $tmp;
}
}
}
}
return $array;
}

Array_multisort How to use sorting

Array_multisort () How to use a two-bit array to sort by a specified key value

In this example, a two-dimensional array named $data is defined and then sorted by the following method
Copy the Code code as follows: $data [] = Array (' volume ' = +, ' edition ' = 2);
$data [] = Array (' volume ' = +, ' edition ' = 1);
$data [] = Array (' volume ' = =, ' edition ' = 6);
$data [] = Array (' volume ' = = 98, ' edition ' = 2);
$data [] = Array (' volume ' = +, ' edition ' = 6);
$data [] = Array (' volume ' = +, ' edition ' = 7);

Get a list of columns
foreach ($data as $key = = $row) {
$volume [$key] = $row [' volume '];
$edition [$key] = $row [' Edition '];
}

Sort data in descending order according to volume, in ascending order of edition
The $data as the last parameter, sorted by the Universal key
Array_multisort ($volume, Sort_desc, $edition, SORT_ASC, $data);
Print_r ($data);

After execution, print the following results:
Copy the Code code as follows: Array
(
[0] = = Array
(
[Volume] = 98
[Edition] = 2
)
[1] = = Array
(
[Volume] = 86
[Edition] = 1
)
[2] = = Array
(
[Volume] = 86
[Edition] = 6

[3] = = Array
(
[Volume] = 85
[Edition] = 6
)
[4] = = Array
(
[Volume] = 67
[Edition] = 2
)
[5] = = Array
(
[Volume] = 67
[Edition] = 7
)
)

One-dimensional array ordering we just use sort () to be able, the relative asort ($arr); function, which is the ordering of key values and maintaining the original key-value relationship.

Same principle, rsort (); Arsort (); Krsort (); Functions except sorting are sorted in descending order, others with sort (); Rsort (); Ksort (); Same.

I hope this article is helpful to everyone's PHP programming.

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