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ArrayHandler: find next or previous key in array and return it

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get next or previous key in array
This commit is contained in:
Clemens Schwaighofer
2023-11-02 14:01:47 +09:00
parent caf03421a7
commit 8bf694b2b2
3 changed files with 159 additions and 1 deletions
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17
www/admin/class_test.array.php
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@@ -21,6 +21,7 @@ ob_end_flush();
use CoreLibs\Combined\ArrayHandler;
use CoreLibs\Debug\Support as DgS;
use CoreLibs\Convert\SetVarType;
use PHPUnit\Framework\Constraint\ArrayHasKey;
$log = new CoreLibs\Logging\Logging([
'log_folder' => BASE . LOG,
@@ -236,6 +237,22 @@ $flag = false;
$output = \CoreLibs\Combined\ArrayHandler::genAssocArray($db_array, $key, $value, $flag);
print "OUTPUT: " . \CoreLibs\Debug\Support::printAr($output) . "<br>";
print "<hr>";
$array = [
'a' => 'First',
'b' => 'Second',
'c' => 'Third',
];
foreach (array_keys($array) as $search) {
print "Result[" . $search . "]: "
. "next: " . DgS::printAr(ArrayHandler::arrayGetNextKey($array, $search)) . ", "
. "prev: " . DgS::printAr(ArrayHandler::arrayGetPrevKey($array, $search))
. "<br>";
}
print "Key not exists: " . DgS::printAr(ArrayHandler::arrayGetNextKey($array, 'z')) . "<br>";
print "</body></html>";
// __END__

48
www/lib/CoreLibs/Combined/ArrayHandler.php
View File

@@ -236,6 +236,54 @@ class ArrayHandler
return $hit_list;
}
/**
* main wrapper function for next/prev key
*
* @param array<mixed> $array array to search in
* @param int|string $key key for next/prev
* @param bool $next [=true] if to search next or prev
* @return int|string|null Next/prev key or null for end/first
*/
private static function arrayGetKey(array $array, int|string $key, bool $next = true): int|string|null
{
$keys = array_keys($array);
if (($position = array_search($key, $keys, true)) === false) {
return null;
}
$next_position = $next ? $position + 1 : $position - 1;
if (!isset($keys[$next_position])) {
return null;
}
return $keys[$next_position];
}
/**
* Get previous array key from an array
* null on not found
*
* @param array<mixed> $array
* @param int|string $key
* @return int|string|null Next key, or null for not found
*/
public static function arrayGetPrevKey(array $array, int|string $key): int|string|null
{
return self::arrayGetKey($array, $key, false);
}
/**
* Get next array key from an array
* null on not found
*
* @param array<mixed> $array
* @param int|string $key
* @return int|string|null Next key, or null for not found
*/
public static function arrayGetNextKey(array $array, int|string $key): int|string|null
{
return self::arrayGetKey($array, $key, true);
}
/**
* correctly recursive merges as an array as array_merge_recursive
* just glues things together