108 lines
3.1 KiB
PHP
108 lines
3.1 KiB
PHP
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<?php
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declare(strict_types=1);
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namespace PhpMyAdmin\Query;
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use PhpMyAdmin\Util;
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use function array_shift;
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use function count;
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use function is_array;
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/**
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* Handles caching results
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*/
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class Cache
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{
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/** @var array Table data cache */
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private $tableCache = [];
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/**
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* Caches table data so Table does not require to issue
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* SHOW TABLE STATUS again
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*
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* @param array $tables information for tables of some databases
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* @param string|bool $table table name
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*/
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public function cacheTableData(array $tables, $table): void
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{
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// Note: I don't see why we would need array_merge_recursive() here,
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// as it creates double entries for the same table (for example a double
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// entry for Comment when changing the storage engine in Operations)
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// Note 2: Instead of array_merge(), simply use the + operator because
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// array_merge() renumbers numeric keys starting with 0, therefore
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// we would lose a db name that consists only of numbers
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foreach ($tables as $one_database => $_) {
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if (isset($this->tableCache[$one_database])) {
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// the + operator does not do the intended effect
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// when the cache for one table already exists
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if ($table && isset($this->tableCache[$one_database][$table])) {
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unset($this->tableCache[$one_database][$table]);
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}
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$this->tableCache[$one_database] += $tables[$one_database];
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} else {
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$this->tableCache[$one_database] = $tables[$one_database];
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}
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}
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}
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/**
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* Set an item in table cache using dot notation.
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*
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* @param array|null $contentPath Array with the target path
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* @param mixed $value Target value
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*/
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public function cacheTableContent(?array $contentPath, $value): void
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{
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$loc = &$this->tableCache;
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if (! isset($contentPath)) {
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$loc = $value;
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return;
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}
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while (count($contentPath) > 1) {
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$key = array_shift($contentPath);
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// If the key doesn't exist at this depth, we will just create an empty
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// array to hold the next value, allowing us to create the arrays to hold
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// final values at the correct depth. Then we'll keep digging into the
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// array.
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if (! isset($loc[$key]) || ! is_array($loc[$key])) {
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$loc[$key] = [];
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}
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$loc = &$loc[$key];
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}
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$loc[array_shift($contentPath)] = $value;
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}
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/**
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* Get a cached value from table cache.
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*
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* @param array $contentPath Array of the name of the target value
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* @param mixed $default Return value on cache miss
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*
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* @return mixed cached value or default
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*/
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public function getCachedTableContent(array $contentPath, $default = null)
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{
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return Util::getValueByKey($this->tableCache, $contentPath, $default);
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}
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public function getCache(): array
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{
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return $this->tableCache;
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}
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public function clearTableCache(): void
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{
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$this->tableCache = [];
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}
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}
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