PHP Multidimensional array sequencing implementation Code _php tutorial

In PHP, the sorting of arrays including one-dimensional array sorting and multi-dimensional array ordering, let me elaborate on the use of PHP array sorting functions and custom functions to achieve data sorting method.

Singular group sort

Sort function Ascending order

BOOL Sort (array & $array [, int $sort _flags= sort_regular])

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$fruits = Array ("Lemon", "orange", "banana", "apple"); Sort ($fruits); Var_dump ($fruits); ?>

-rsort descending order--

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$fruits = Array ("Lemon", "orange", "banana", "apple"); Rsort ($fruits); Var_dump ($fruits); ?>

For example, there is a multidimensional array:

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$arr = Array ( ' d ' = = Array (' id ' = = 5, ' name ' = + 1, ' age ' = 7), ' b ' = = Array (' id ' = 2, ' name ' = + 3, ' age ' = 4), ' a ' = = Array (' id ' = 8, ' name ' = ' = ', ' age ' = 5), ' c ' = = Array (' id ' = = 1, ' name ' = + 2, ' age ' = 2) );

You need to sort the age items in a two-dimensional array.

PHP's built-in function array_multisort () is required,

Array_multisort () requires an array containing columns, so use the following code to get the columns, and then sort them.

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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

Custom functions:

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function Multi_array_sort ($multi _array, $sort _key, $sort =sort_asc) { if (Is_array ($multi _array)) { foreach ($multi _array as $row _array) { if (Is_array ($row _array)) { $key _array[] = $row _array[$sort _key]; } Else { return false; } } } Else { return false; } Array_multisort ($key _array, $sort, $multi _array); return $multi _array; }

Processing

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print_r (Multi_array_sort ($arr, ' age ')); //Output Array ( [c] = + Array ( [id] + 1 [name] + 2 [age] + 2 ) [b] = = Array ( [id] = 2 [name] + 3 [age] + 4 ) [a] + = array ( [id] =&G T 8 [Name] = [age] = 5 ) [d] = = Array ( [id] + 5 [name] + 1 [age] = 7 ) )

Actually there are many other ways to use it in the sort order, such as PHP's array of Arsort (), Asort (), Ksort (), Krsort (), Natsort (), Natcasesort (), Rsort (), Usort ( ), Array_multisort () and Uksort ().

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