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Get an xPDO configuration option value by key.
mixed getOption (string $key [, array|null $options [, mixed $default [, boolean $skipEmpty]]] )
$key: the key of the setting or option to load.
$options: the source of the setting or option. Either null (which attempts to find the key in the main configuration) or an array of options.
$default: the value to return when the key was not found.
$skipEmpty: when set to true, the $default will also be returned if the $key's value is an empty string. Added in xPDO 2.2.1 / MODX 2.2.0-rc2.
Get the table prefix:
$tablePrefix = $xpdo->getOption(xPDO::OPT_TABLE_PREFIX);
Get an option from a user-specified array, and if not set, check for it in $xpdo->config. If it's not set there, return false as its default value:
$mySetting = $xpdo->getOption('my_setting',$myConfig,false);