PHP 5.5.20 is available

get_resource_type

(PHP 4 >= 4.0.2, PHP 5)

get_resource_type Liefert den Typ einer Resource

Beschreibung

string get_resource_type ( resource $handle )

Diese Funktion ermittelt den Typ der übergebenen Resource.

Parameter-Liste

handle

Ein Resource Handle.

Rückgabewerte

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

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

Beispiele

Beispiel #1 get_resource_type() Beispiel

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

// Gergebnis: file
$fp fopen("foo""w");
echo 
get_resource_type($fp) . "\n";

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

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User Contributed Notes 4 notes

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1
CertaiN
11 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
-5
avp200681 at gmail dot com
3 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));

?>
up
-5
jdhawk _at_ gmail
9 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
-6
hessodreamy at gmail dot com
7 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.
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