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PHP 创建文件(文件夹)以及目录操作代码

Jun 06, 2016 pm 08:33 PM
php folder Directory operations

PHP 创建文件(文件夹)以及目录操作代码,需要的朋友可以参考下。

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:
代码如下:
$base_dir="filelist/";
$fso=opendir($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。
代码如下:
$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.:
代码如下:
$file = 'dirlist.php';
if (is_readable($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
代码如下:
$file = "filelist.php";
if (file_exists($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:
还有一种方式,可以读取二进制的文件:
代码如下:
$data = implode('', file($file));

● 写文件
和读取文件的方式一样,先看看是不是能写:
代码如下:
$file = 'dirlist.php';
if (is_writable($file) == false) {
die("You have no right to write!");
}
?>

能写了的话可以使用file_put_contents函数写入:
代码如下:
$file = 'dirlist.php';
if (is_writable($file) == false) {
die('我是鸡毛,我不能');
}
$data = '我是可鄙,我想要';
file_put_contents ($file, $data);
?>

file_put_contents函数在php5中新引进的函数(不知道存在的话用function_exists函数先判断一下)低版本的php无法使用,可以使用如下方式:
代码如下:
$f = fopen($file, 'w');
fwrite($f, $data);
fclose($f);

替换之.
写文件的时候有时候需要锁定,然后写:
代码如下:
function cache_page($pageurl,$pagedata){
if(!$fso=fopen($pageurl,'w')){
$this->warns('无法打开缓存文件.');//trigger_error
return false;
}
if(!flock($fso,LOCK_EX)){//LOCK_NB,排它型锁定
$this->warns('无法锁定缓存文件.');//trigger_error
return false;
}
if(!fwrite($fso,$pagedata)){//写入字节流,serialize写入其他格式
$this->warns('无法写入缓存文件.');//trigger_error
return false;
}
flock($fso,LOCK_UN);//释放锁定
fclose($fso);
return true;
}

● 复制,删除文件
php删除文件非常easy,用unlink函数简单操作:
代码如下:
$file = 'dirlist.php';
$result = @unlink ($file);
if ($result == false) {
echo '蚊子赶走了';
} else {
echo '无法赶走';
}
?>

即可.
复制文件也很容易:
代码如下:
$file = 'yang.txt';
$newfile = 'ji.txt'; # 这个文件父文件夹必须能写
if (file_exists($file) == false) {
die ('小样没上线,无法复制');
}
$result = copy($file, $newfile);
if ($result == false) {
echo '复制记忆ok';
}
?>

可以使用rename()函数重命名一个文件夹.其他操作都是这几个函数组合一下就能实现的.
● 获取文件属性
我说几个常见的函数:
获取最近修改时间:
代码如下:
$file = 'test.txt';
echo date('r', filemtime($file));
?>

返回的说unix的时间戳,这在缓存技术常用.
相关的还有获取上次被访问的时间fileatime(),filectime()当文件的权限,所有者,所有组或其它 inode 中的元数据被更新时间,fileowner()函数返回文件所有者
$owner = posix_getpwuid(fileowner($file));
(非window系统),ileperms()获取文件的权限,
代码如下:
$file = 'dirlist.php';
$perms = substr(sprintf('%o', fileperms($file)), -4);
echo $perms;
?>

filesize()返回文件大小的字节数:
代码如下:
// 输出类似:somefile.txt: 1024 bytes
$filename = 'somefile.txt';
echo $filename . ': ' . filesize($filename) . ' bytes';
?>

获取文件的全部信息有个返回数组的函数stat()函数:
代码如下:
$file = 'dirlist.php';
$perms = stat($file);
var_dump($perms);
?>
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