function DrupalDatabaseCache::isValidBin

Checks if $this->bin represents a valid cache table.

This check is required to ensure that non-cache tables are not truncated accidentally when calling cache_clear_all().

Return value

boolean

File

includes/cache.inc, line 578

Class

DrupalDatabaseCache

Defines a default cache implementation.

Code

function isValidBin() {
    if ($this->bin == 'cache' || substr($this->bin, 0, 6) == 'cache_') {
        // Skip schema check for bins with standard table names.
        return TRUE;
    }
    // These fields are required for any cache table.
    $fields = array(
        'cid',
        'data',
        'expire',
        'created',
        'serialized',
    );
    // Load the table schema.
    $schema = drupal_get_schema($this->bin);
    // Confirm that all fields are present.
    return isset($schema['fields']) && !array_diff($fields, array_keys($schema['fields']));
}