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IXR_IntrospectionServer::addCallback( $method, $callback, $args, $help )

Source

File: wp-includes/IXR/class-IXR-introspectionserver.php

function addCallback($method, $callback, $args, $help)
    {
        $this->callbacks[$method] = $callback;
        $this->signatures[$method] = $args;
        $this->help[$method] = $help;
    }

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/ixr_introspectionserver/addcallback