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Homephp教程php手册PHP中is_dir()函数使用指南,is_dir使用指南

PHP中is_dir()函数使用指南,is_dir使用指南

函数:is_dir()

功能:判断给定文件名是否是一个目录

说明:
bool is_dir ( string $filename )

如果文件名存在并且为目录则返回 TRUE。
如果 filename 是一个相对路径,则按照当前工作目录检查其相对路径。

注: 本函数的结果会被缓存。更多信息参见 clearstatcache()。

例子1

<&#63;
var_dump(is_dir('a_file.txt')) . "\n";
var_dump(is_dir('bogus_dir/abc')) . "\n";
var_dump(is_dir('..')); //one dir up
&#63;>

上例将输出:

bool(false)
bool(false)
bool(true)

例子2

<&#63;php
$file = "images";
if(is_dir($file))
{
echo ("$file is a directory");
}
else
{
echo ("$file is not a directory");
}
&#63;>

输出:
如果存在images这个目录,则输出:
images is a directory

以上所述就是本文的全部内容了,希望大家能够喜欢。

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