function DatabaseConnection::escapeAlias

Escapes an alias name string.

Force all alias names to be strictly alphanumeric-plus-underscore. In contrast to DatabaseConnection::escapeField() / DatabaseConnection::escapeTable(), this doesn't allow the period (".") because that is not allowed in aliases.

Return value

string The sanitized field name string.

File

includes/database/database.inc, line 1021

Class

DatabaseConnection

Base Database API class.

Code

public function escapeAlias($field) {
    if (!isset($this->escapedAliases[$field])) {
        $this->escapedAliases[$field] = preg_replace('/[^A-Za-z0-9_]+/', '', $field);
    }
    return $this->escapedAliases[$field];
}