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функция не описана

IXR_IntrospectionServer::methodSignature() public WP 1.0

It's a method of the class: IXR_IntrospectionServer{}

Хуков нет.

Возвращает

Null. Ничего.

Использование

$IXR_IntrospectionServer = new IXR_IntrospectionServer();
$IXR_IntrospectionServer->methodSignature( $method );

Код IXR_IntrospectionServer::methodSignature() WP 5.5.1

<?php
function methodSignature($method)
{
    if (!$this->hasMethod($method)) {
        return new IXR_Error(-32601, 'server error. requested method "'.$method.'" not specified.');
    }
    // We should be returning an array of types
    $types = $this->signatures[$method];
    $return = array();
    foreach ($types as $type) {
        switch ($type) {
            case 'string':
                $return[] = 'string';
                break;
            case 'int':
            case 'i4':
                $return[] = 42;
                break;
            case 'double':
                $return[] = 3.1415;
                break;
            case 'dateTime.iso8601':
                $return[] = new IXR_Date(time());
                break;
            case 'boolean':
                $return[] = true;
                break;
            case 'base64':
                $return[] = new IXR_Base64('base64');
                break;
            case 'array':
                $return[] = array('array');
                break;
            case 'struct':
                $return[] = array('struct' => 'struct');
                break;
        }
    }
    return $return;
}