Iterator
in package
Iterator utility.
Table of Contents
Methods
- duplicateCombinations() : void
- Duplicate combinations with duplicates - What was taken out once can be taken out again - The order in which the items are retrieved is meaningless (if the elements that make up the pair are the same, they are treated as the same even if they are in a different order) ```php \X\Util\Iterator::duplicateCombinations('abc', 2, 0, '', $return); var_export($return); // array ( // 0 => 'aa', // 1 => 'ab', // 2 => 'ac', // 3 => 'bb', // 4 => 'bc', // 5 => 'cc', // ) ```
- duplicatePermutation() : void
- Permutations with duplicates.
- unDuplicateCombinations() : void
- No duplicate combination.
- unDuplicatePermutation() : void
- Non-duplicate permutation.
Methods
duplicateCombinations()
Duplicate combinations with duplicates - What was taken out once can be taken out again - The order in which the items are retrieved is meaningless (if the elements that make up the pair are the same, they are treated as the same even if they are in a different order) ```php \X\Util\Iterator::duplicateCombinations('abc', 2, 0, '', $return); var_export($return); // array ( // 0 => 'aa', // 1 => 'ab', // 2 => 'ac', // 3 => 'bb', // 4 => 'bc', // 5 => 'cc', // ) ```
public
static duplicateCombinations(string $str, int $r[, int $start = 0 ][, string $progress = '' ][, array<string|int, mixed>|null &$return = [] ]) : void
Parameters
- $str : string
-
Input string.
- $r : int
-
String length of the result of the combination.
- $start : int = 0
-
The position from which the input string is taken.
- $progress : string = ''
-
String in progress.
- $return : array<string|int, mixed>|null = []
-
Combination Results.
duplicatePermutation()
Permutations with duplicates.
public
static duplicatePermutation(string $str, int $r[, string $progress = '' ][, array<string|int, mixed>|null &$return = [] ]) : void
- An item taken out once can be taken out again.
- The order in which the items are retrieved makes sense (even if the elements of a pair are the same, they are treated as different if they are in a different order).
\X\Util\Iterator::duplicatePermutation('abc', 2, '', $return);
var_export($return);
// array (
// 0 => 'aa',
// 1 => 'ab',
// 2 => 'ac',
// 3 => 'ba',
// 4 => 'bb',
// 5 => 'bc',
// 6 => 'ca',
// 7 => 'cb',
// 8 => 'cc'
// )
Parameters
- $str : string
-
Input string.
- $r : int
-
String length of the result of the combination.
- $progress : string = ''
-
String in progress.
- $return : array<string|int, mixed>|null = []
-
Combination Results.
unDuplicateCombinations()
No duplicate combination.
public
static unDuplicateCombinations(string $str, int $r[, int $start = 0 ][, string $progress = '' ][, array<string|int, mixed>|null &$return = [] ]) : void
- Once something is taken out once, it cannot be taken out again.
- The order in which the items are taken out is meaningless (if the elements of a pair are the same, they are treated as the same even if they are taken out in a different order).
\X\Util\Iterator::unDuplicateCombinations('abc', 2, 0, '', $return);
var_export($return);
// array (
// 0 => 'ab',
// 1 => 'ac',
// 2 => 'bc',
// )
Parameters
- $str : string
-
Input string.
- $r : int
-
String length of the result of the combination.
- $start : int = 0
-
The position from which the input string is taken.
- $progress : string = ''
-
String in progress.
- $return : array<string|int, mixed>|null = []
-
Combination Results.
Return values
void —unDuplicatePermutation()
Non-duplicate permutation.
public
static unDuplicatePermutation(string $str, int $r[, string $progress = '' ][, array<string|int, mixed>|null &$return = [] ]) : void
- Once retrieved cannot be retrieved again.
- The order in which the items are taken out makes sense (even if the elements of a pair are the same, they are treated as different if they are taken out in a different order).
\X\Util\Iterator::unDuplicatePermutation('abc', 2, '', $return);
var_export($return);
// array (
// 0 => 'ab',
// 1 => 'ac',
// 2 => 'ba',
// 3 => 'bc',
// 4 => 'ca',
// 5 => 'cb',
// )
Parameters
- $str : string
-
Input string.
- $r : int
-
String length of the result of the combination.
- $progress : string = ''
-
String in progress.
- $return : array<string|int, mixed>|null = []
-
Combination Results.