get_resource_type

    (PHP 4 >= 4.0.2, PHP 5, PHP 7, PHP 8)

    get_resource_type — Returns the resource type

    Опис

    get_resource_type(resource $resource): string

    This function gets the type of the given resource.

    Параметри

    resource

    The evaluated resource handle.

    Значення, що повертаються

    If the given resource is a resource, this function will return a string representing its type. If the type is not identified by this function, the return value will be the string Unknown.

    This function will return null and generate an error if resource is not a resource.

    Приклади

    Приклад #1 get_resource_type() example

    <?php
    $fp     = fopen("foo", "w");
    echo     get_resource_type($fp) . "\n";

    // As of PHP 8.0.0, the following does not work anymore. The curl_init function returns a CurlHandle object now.
    $c = curl_init();
    echo     get_resource_type($c) . "\n";
    ?>

    В PHP 7 поданий вище приклад виведе:

    stream
curl

    Прогляньте також

    Improve This Page

    Learn How To Improve This Page • Submit a Pull Request • Report a Bug
    ＋add a note

    User Contributed Notes 1 note

    up
    15
    CertaiN
    10 years ago
    Try this to know behavior:

    <?php
    function resource_test($resource, $name) {
    echo
    '[' . $name. ']',
    PHP_EOL,
    '(bool)$resource => ',
    $resource ? 'TRUE' : 'FALSE',
    PHP_EOL,
    'get_resource_type($resource) => ',
    get_resource_type($resource) ?: 'FALSE',
    PHP_EOL,
    'is_resoruce($resource) => ',
    is_resource($resource) ? 'TRUE' : 'FALSE',
    PHP_EOL,
    PHP_EOL
    ;
    }

    $resource = tmpfile();
    resource_test($resource, 'Check Valid Resource');

    fclose($resource);
    resource_test($resource, 'Check Released Resource');

    $resource = null;
    resource_test($resource, 'Check NULL');
    ?>

    It will be shown as...

    [Check Valid Resource]
    (bool)$resource => TRUE
    get_resource_type($resource) => stream
    is_resoruce($resource) => TRUE

    [Check Released Resource]
    (bool)$resource => TRUE
    get_resource_type($resource) => Unknown
    is_resoruce($resource) => FALSE

    [Check NULL]
    (bool)$resource => FALSE
    get_resource_type($resource) => FALSE
    Warning: get_resource_type() expects parameter 1 to be resource, null given in ... on line 10
    is_resoruce($resource) => FALSE
    ＋add a note
    To Top