get_resource_type

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

get_resource_typeLiefert den Typ einer Ressource

Beschreibung

get_resource_type ( resource $handle ) : string

Diese Funktion gibt den Typ der angegebenen Ressource zurück.

Parameter-Liste

handle

Das auszuwertende Ressourcen-Handle.

Rückgabewerte

Ist der Parameter handle eine Ressource, so gibt die Funktion eine textuelle Darstellung des Ressource-Typen zurück. Kann der Typ nicht von dieser Funktion ermittelt werden, so wird der String Unknown zurückgegeben.

Die Funktion gibt null zurück und erzeugt eine Fehlermeldung, wenn handle nicht vom Typ resource ist.

Beispiele

Beispiel #1 get_resource_type()-Beispiel

<?php
// Ergebnis: stream
$fp fopen("foo""w");
echo 
get_resource_type($fp) . "\n";

// Ergebnis: curl
$c curl_init();
echo 
get_resource_type($c) . "\n"// funktioniert vor PHP 8.0.0, da curl_init()
                                   // seit 8.0 ein CurlHandle-Objekt zurückgibt
?>

Siehe auch

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User Contributed Notes 4 notes

up
11
CertaiN
7 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
up
-8
jdhawk _at_ gmail
15 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
-18
hessodreamy at gmail dot com
13 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
-26
avp200681 at gmail dot com
9 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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