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    get_resource_type

    (PHP 4 >= 4.0.2, PHP 5)

    get_resource_type — Devuelve el tipo de recurso

    Descripción

    string get_resource_type ( resource $handle )

    Esta función obtiene el tipo del recurso dado.

    Parámetros

    handle

    El gestor de recurso evaluado.

    Valores devueltos

    Si el dado handle es un recurso esta función devolverá una cadena que representa su tipo. Si el tipo no es identificado por esta función, el valor de retorno será la cadena Unknown.

    Está función devolverá FALSE y generará un error si handle no es un resource.

    Ejemplos

    Ejemplo #1 Ejemplo deget_resource_type()

    <?php
    // imprime: mysql link
    $c = mysql_connect();
    echo     get_resource_type($c) . "\n";

    // imprime: stream
    $fp = fopen("foo", "w");
    echo     get_resource_type($fp) . "\n";

    // imprime: domxml document
    $doc = new_xmldoc("1.0");
    echo     get_resource_type($doc->doc) . "\n";
    ?>

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    User Contributed Notes 5 notes

    up
    1
    CertaiN
    3 months 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
    up
    -2
    CertaiN
    3 months 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(tmpfile());
    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
    up
    -3
    jdhawk _at_ gmail
    8 years ago
    In PHP5 (on Linux), the above example identifies the "file" handler as a 'stream', not 'file'.

    This can be particularly worrisome if you're trying to determine the type of stream using this function.

    The alternative is to use <?php stream_get_meta_data() ?>, which returns an array containing "stream_type (string) - a label describing the underlying implementation of the stream."
    up
    -3
    hessodreamy at gmail dot com
    6 years ago
    Furthermore, this function returns 'stream' on php 4.3 on windows & linux.
    You if you want to differentiate between a file resource and other stream resources, as stated before stream_get_meta_data() gives you an array which, on my system, contains the following elements which might suggest a file handle:
    [wrapper_type] => plainfile
    [stream_type] => STDIO

    However I've only compared this to a stream from a url, so I include this only as a suggestion.
    up
    -5
    avp200681 at gmail dot com
    2 years ago
    This function will generate an error and return NULL instead FALSE in the next example:

    <?php

    $var     = 3;
    var_dump(get_resource_type($var));

    ?>
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