get_resource_type

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

get_resource_type Returns the resource type

Опис

string get_resource_type ( resource $handle )

This function gets the type of the given resource.

Параметри

handle

The evaluated resource handle.

Значення, що повертаються

If the given handle 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 FALSE and generate an error if handle is not a resource.

Приклади

Приклад #1 get_resource_type() example

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

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

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

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User Contributed Notes 1 note

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13
CertaiN
8 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
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