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php中的filesystem文件系统函数介绍及使用示例_PHP

Jun 01, 2016 am 11:55 AM
File system

basename — 返回路径中的文件名部分
dirname — 返回路径中的目录部分

复制代码 代码如下:
string basename ( string $path [, string $suffix ] )
string dirname ( string $path )

示例:
复制代码 代码如下:
$path = "/home/httpd/phpha.com/index.php";
echo basename($path);
echo basename($path, '.php');
echo basename($path, '.xxx');
echo dirname($path);
?>

复制代码 代码如下:
//结果:
index.php
index
index.php
/home/httpd/phpha.com

说明:如果文件名是以正确的suffix结束的,那这一部分也会被去掉。

chgrp — 改变文件所属的组
chown — 改变文件的所有者
chmod — 改变文件模式

复制代码 代码如下:
bool chmod ( string $filename , int $mode )

示例:

复制代码 代码如下:
chmod('/home/phpha.txt', 0755);
?>
copy — 拷贝文件

if(copy('index.php', 'index.php.bak')){
 echo 'copy success';
}
?>
//在当前目录下生存了index.php.bak文件

delete — 参见 unlink 或 unset
unlink — 删除文件

复制代码 代码如下:
if(unlink('index.php.bak')){
 echo 'unlink success';
}
?>
//删除了index.php.bak

disk_free_space — 返回目录中的可用空间
disk_total_space — 返回一个目录的磁盘总大小
diskfreespace — disk_free_space 的别名

复制代码 代码如下:
//在 Windows 下:
echo disk_free_space("C:"), '
';
echo disk_total_space("C:");
?>

复制代码 代码如下:
//结果:返回的是字节数
17433419776
32218386432

fopen — 打开文件或者 URL
fgets — 从文件指针中读取一行
feof — 测试文件指针是否到了文件结束的位置
fread — 读取文件(可安全用于二进制文件)
fwrite — 写入文件(可安全用于二进制文件)
fclose — 关闭一个已打开的文件指针

复制代码 代码如下:
$fp = fopen('hello.txt', 'r'); //打开一个文件
$n = 1;
while(!feof($fp)){
 echo $n, ' - ', fgets($fp), '
'; //读取一行并输出
 $n++;
}
fclose($fp); //关闭文件
?>

复制代码 代码如下:
//输出:
1 - Welcome to my blog:
2 - http://www.bitsCN.com

fgetc — 从文件指针中读取字符
fgetcsv — 从文件指针中读入一行并解析 CSV 字段
fgetss — 从文件指针中读取一行并过滤掉 HTML 标记
fputcsv — 将行格式化为 CSV 并写入文件指针
fputs — fwrite 的别名

复制代码 代码如下:
$fp = fopen('hello.txt', 'r');
while(false !== ($char = fgetc($fp))){
    echo $char, '-';
}
?>

复制代码 代码如下:
//输出:
W-e-l-c-o-m-e- -t-o- -m-y- -b-l-o-g-:- - -h-t-t-p-:-/-/-b-l-o-g-.-p-h-p-h-a-.-c-o-m-

file_exists — 检查文件或目录是否存在

复制代码 代码如下:
if(file_exists('hello.txt')){
 echo 'hello.txt exists';
}else{
 echo 'hello.txt not exists';
}
?>

[/code]
//输出:
hello.txt exists
[/code]

file_get_contents — 将整个文件读入一个字符串
file_put_contents — 将一个字符串写入文件
file — 把整个文件读入一个数组中

复制代码 代码如下:
if($content = file_get_contents('hello.txt')){
 file_put_contents('hello.txt.bak', $content);
}
?>
//相当于copy了一份hello.txt
if($content = file('hello.txt')){
 print_r($content);
}
?>
//数组形式,每一行是一个数组成员
Array
(
    [0] => Welcome to my blog:
    [1] => http://www.bitsCN.com
)

fileatime — 取得文件的上次访问时间
filectime — 取得文件的 inode 修改时间
filegroup — 取得文件的组
fileinode — 取得文件的 inode
filemtime — 取得文件修改时间
fileowner — 取得文件的所有者
fileperms — 取得文件的权限
filesize — 取得文件大小
filetype — 取得文件类型

复制代码 代码如下:
echo fileatime('hello.txt');
echo filectime('hello.txt');
echo filegroup('hello.txt');
echo filemtime('hello.txt');
echo fileowner('hello.txt');
echo substr(sprintf('%o', fileperms('hello.txt')), -4);
echo filesize('hello.txt');
echo filetype('hello.txt');
?>

复制代码 代码如下:
//输出:
1353329003
1353329003
0
1353330002
0
0666
42
file

flock — 轻便的咨询文件锁定
fnmatch — 用模式匹配文件名
fflush — 将缓冲内容输出到文件
fpassthru — 输出文件指针处的所有剩余数据
fscanf — 从文件中格式化输入
fseek — 在文件指针中定位
fstat — 通过已打开的文件指针取得文件信息
ftell — 返回文件指针读/写的位置
ftruncate — 将文件截断到给定的长度
glob — 寻找与模式匹配的文件路径

is_dir — 判断给定文件名是否是一个目录
is_executable — 判断给定文件名是否可执行
is_file — 判断给定文件名是否为一个正常的文件
is_link — 判断给定文件名是否为一个符号连接
is_readable — 判断给定文件名是否可读
is_uploaded_file — 判断文件是否是通过 HTTP POST 上传的
is_writable — 判断给定的文件名是否可写
is_writeable — is_writable 的别名
说明:以上函数都是用来判断文件或目录是否符合对应的条件,返回TRUE或FALSE。

lchgrp — Changes group ownership of symlink
lchown — Changes user ownership of symlink
link — 建立一个硬连接
linkinfo — 获取一个连接的信息
lstat — 给出一个文件或符号连接的信息
mkdir — 新建目录
move_uploaded_file — 将上传的文件移动到新位置
parse_ini_file — 解析一个配置文件
pathinfo — 返回文件路径的信息
pclose — 关闭进程文件指针
popen — 打开进程文件指针
readfile — 输出一个文件
readlink — 返回符号连接指向的目标
realpath — 返回规范化的绝对路径名
rename — 重命名一个文件或目录
rewind — 倒回文件指针的位置
rmdir — 删除目录
set_file_buffer — stream_set_write_buffer 的别名
stat — 给出文件的信息
symlink — 建立符号连接
tempnam — 建立一个具有唯一文件名的文件
tmpfile — 建立一个临时文件
touch — 设定文件的访问和修改时间
umask — 改变当前的 umask
clearstatcache — 清除文件状态缓存

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