get_resource_type

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

get_resource_type 자원형을 반환

설명

string get_resource_type ( resource $handle )

주어진 자원의 자료형을 얻습니다.

인수

handle

평가할 자원 핸들.

반환값

주어진 handle이 자원이면, 이 함수는 그 자료형의 문자열 표현을 반환합니다. 자료형을 식별할 수 없으면, 반환값은 문자열 Unknown입니다.

handleresource가 아닐 경우, FALSE를 반환하고 오류를 발생합니다.

예제

Example #1 get_resource_type() 예제

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

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

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

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User Contributed Notes 4 notes

up
11
CertaiN
5 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
14 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
12 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
8 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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