Automattic\WooCommerce\Vendor\GraphQL\Error

Warning::setWarningHandler │ public static │ WC 1.0

Sets warning handler which can intercept all system warnings. When not set, trigger_error() is used to notify about warnings.

Method of the class: Warning{}

No Hooks.

Returns

null. Nothing (null).

Usage

$result = Warning::setWarningHandler( ?callable $warningHandler ): void;
?callable $warningHandler
.
Default: null

Warning::setWarningHandler() code WC 10.9.1

woocommerce/lib/packages/GraphQL/Error/Warning.php 
public static function setWarningHandler(?callable $warningHandler = null): void
{
    self::$warningHandler = $warningHandler;
}