PHP one-dimensional array sorting and multidimensional array sorting _php tutorial

PHP Tutorial One-dimensional array sorting and multidimensional array sorting

See the example of one-dimensional data sorting asort () function and Ksort () function


The Asort () function takes the value of the array in ascending order
$mix = Array ("Clalei" =>10, "Bill" =>50, "Aala" =>100);
Asort ($mix);
Print_r ($mix);
The Ksort () function is based on the keyword ascending of the array
$mix = Array ("Clalei" =>100, "Bill" =>50, "Aala" =>10);
Ksort ($mix);
Print_r ($mix);

?>

One-dimensional data sorting two

The sort () function, which sorts the array in ascending order of letters or numbers (from low to high):

$name = Array ("Clalei", "Bill", "Aala");
Sort ($name);
for ($i =0; $i <3; $i + +) {
echo $name [$i];
}
echo "
";
$price = Array (100,50,10);
Sort ($price);
for ($i =0; $i <3; $i + +) {
echo $price [$i]. "| ";
}

?>

Okay, now let's take a look at the two-dimensional database tutorial sort instance Code

$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);

In this example, the volume is sorted in descending order, and the edition in ascending order.

Now that you have an array with rows, but Array_multisort () requires an array of columns, so use the following code to get the columns and sort them.
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);

The data set is now sorted and the results are as follows:
Volume | Edition
-------+--------
98 | 2
86 | 1
86 | 6
85 | 6
67 | 2
67 | 7

Two-dimensional array sorting three

Array_multisort () sorting a two-dimensional array
Array $roughdata, we intend to sort by accurancy.

Array ([0] = = Array ([username] = 10yl [accuracy] = 0.00) [1] = = Array ([username] = 11yl [accuracy] = = 1.00) [2] = = Array ([username] = 12yl [accuracy] = 0.00) [3] = = Array ([username] + 13yl [accu Racy] = 1.00))
Method:
(1) Extracting an array of accuracy columns

foreach ($roughData as $key = = $row) {
$usernames [$key] = $row [' username '];
$accuracy [$key] = $row [' accuracy '];
}

(2) Sorting
Array_multisort ($accuracy, SORT_ASC, $roughData);

When Print_r ($roughData), we will get a two-dimensional array sorted by accuracy ascending order

Let's look at a simple example. Using two-dimensional array sorting method

$array [] = Array ("Age" =>20, "name" = "Li");
$array [] = Array ("Age" =>21, "name" = "AI");
$array [] = Array ("Age" =>20, "name" = "CI");
$array [] = Array ("Age" =>22, "name" = "Di");

foreach ($array as $key = = $value) {
$age [$key] = $value [' Age '];
$name [$key] = $value [' name '];
}

Array_multisort ($age, Sort_numeric,sort_desc, $name, SORT_STRING,SORT_ASC, $array);
Print_r ($array);
?>

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