WordPress at a glance
function is not described

Requests_Transport_cURL::test() public WP 1.0

Whether this transport is valid

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

No Hooks.

Return

true/false. True if the transport is valid, false otherwise.

Usage

$result = Requests_Transport_cURL::test( $capabilities );

Code of Requests_Transport_cURL::test() WP 5.5.1

<?php
public static function test($capabilities = array()) {
	if (!function_exists('curl_init') || !function_exists('curl_exec')) {
		return false;
	}

	// If needed, check that our installed curl version supports SSL
	if (isset($capabilities['ssl']) && $capabilities['ssl']) {
		$curl_version = curl_version();
		if (!(CURL_VERSION_SSL & $curl_version['features'])) {
			return false;
		}
	}

	return true;
}