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* @param array<string, bool> $capabilities Optional. Associative array of capabilities to test against, i.e. `['<capability>' => true]`.

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* @return bool Whether the transport can be used.

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public static function test($capabilities = []) {

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if (!function_exists('fsockopen')) {

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return false;

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}

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// If needed, check that streams support SSL

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if (isset($capabilities[Capability::SSL]) && $capabilities[Capability::SSL]) {

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if (!extension_loaded('openssl') || !function_exists('openssl_x509_parse')) {

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return false;

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}

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}

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return true;

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}

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}

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