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php is_file()和is_dir()用于遍历目录时用法注意事项

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Release: 2016-06-13 12:18:06
Original
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1、目录inc有以下内容:
子目录 0
子目录 a
footer.html
header.html
login_function.inc.php
mysqli_connect.php
style.css

2、现在PHP要遍历inc目录,并只显示文件,不显示目录0和a,代码如下:

复制代码 代码如下:


$dir = $_SERVER['DOCUMENT_ROOT'];
$dir = "$dir/inc/";
$d = opendir($dir);
while(false !==($f=readdir($d)))
{
if(is_file($f)){
echo "

$f

";
}else{
echo "

是目录$f

";
}
}
closedir($d);

结果却只显示了“footer.html”是文件,其它都变成目录了:
是目录.
是目录..
是目录a
footer.html
是目录header.html
是目录login_function.inc.php
是目录mysqli_connect.php
是目录style.css

这是由于不能在is_file和is_dir中直接使用“$f”,这样会被PHP当作是根目录下的该文件,而在我的根目录下有footer.html这个文件,所以会正确显示这个文件。其它则不行。代码改成:
要正确显示,需要改造代码:

复制代码 代码如下:


while(false !== ($f=readdir($d)))
{
if(is_file("$dir/$f")){
echo "

$f

";
}else{
echo "

是目录$f

";
}
}
closedir($d);
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