get_resource_type

(PHP 4 >= 4.0.2, PHP 5)

get_resource_type — 返回资源（resource）类型

描述

string get_resource_type ( resource $handle )

此函数返回一个字符串，用于表示传递给它的 resource 的类型。如果参数不是合法的 resource，将产生错误。


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

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

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

PHP手册 - N: 返回资源（resource）类型

用户评论:

avp200681 at gmail dot com (13-Jun-2011 11:11)

This function will generate an error and return NULL instead FALSE in the next example: <?php $var = 3; var_dump(get_resource_type($var)); ?>

hessodreamy at gmail dot com (29-May-2007 12:07)

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.

jdhawk _at_ gmail (05-Oct-2005 09:18)

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."