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PHP创建文件(夹)以及目录的操作实例

Jun 13, 2016 am 11:37 AM
php re one function create Example operate document of Table of contents read first

一、目录操作

首先是从目录读取的函数,opendir(),readdir(),closedir(),使用的时候是先打开文件句柄,而后迭代列出:
$base_dir="liehuonet/";
$fso=opendir($base_dir);
echo $base_dir."


";
while($flist=readdir($fso)){
echo $flist."
";
}
closedir($fso)
?>
这是讲返回文件目录下面的文件已经目录的程序(0文件将返回false).

有时候需要知道目录的信息,可以使用dirname($path)和basename($path),分别返回路径的目录部分和文件名名称部分,可用disk_free_space($path)返回查看空间剩余空间.

创建命令:

mkdir($path,0777):0777是权限码,在非window下可用umask()函数设置.

rmdir($path):将删除路径在$path的文件.

二、文件操作

● 新建文件

首先,确定你所要新建文件所在的目录权限; 建议设备为777。然后,新建文件的名称建议使用绝对路径。
$filename="test.txt";
$fp=fopen("$filename", "w+"); //打开文件指针,创建文件
if ( !is_writable($filename) ){
die("文件:" .$filename. "不可写,请检查!");
}
//fwrite($filename, "anything you want to write to $filename.";
fclose($fp); //关闭指针

● 读文件

首先是一个文件看能不能读取(权限问题),或者存在不,我们可以用is_readable函数获取信息.:

$file = 'dirlist.php';
if (is_readable($file) == false) {
die('文件不存在或者无法读取');
} else {
echo '存在';
}
?>

判断文件存在的函数还有file_exists(下面演示),但是这个显然无is_readable全面.,当一个文件存在的话可以用

$file = "filelist.php";
if (file_exists($file) == false) {
die('文件不存在');
}
$data = file_get_contents($file);
echo htmlentities($data);
?>
但是file_get_contents函数在较低版本上不支持,可以先创建文件的一个句柄,然后用指针读取全部:

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