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
?>


add a note add a note User Contributed Notes
jdhawk _at_ gmail
06-Oct-2005 04:18
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."