基于PHP文件操作的详解
本篇文章是对PHP文件操作的应用进行了详细的分析介绍,需要的朋友参考下
知识点简介:
1.判断文件或目录是否存在bool
复制代码 代码如下:
file_exists(string filename)
2.取得文件名
复制代码 代码如下:
basename(filepath)
3.打开文件
复制代码 代码如下:
fopen(filename,mode)
4.获取文件路径信息
复制代码 代码如下:
pathinfo(path)
5.写文件
复制代码 代码如下:
fwrite(resource,string)
6.取绝对路径
复制代码 代码如下:
realpath(filename)
7.关闭文件
复制代码 代码如下:
fclose($handle)
8.复制文件
复制代码 代码如下:
copy(source,dest)
9.读取一行数据
复制代码 代码如下:
fgets(int handle[,int length])
10.判断是否是目录
复制代码 代码如下:
is_dir(filename)
11.读取整个文件
复制代码 代码如下:
readfile(filename)
12. 打开目录
复制代码 代码如下:
opendir(path)
13.取文件大小
复制代码 代码如下:
filesize(filename)
14.读取目录
复制代码 代码如下:
readdir($handle)
15.删除文件
复制代码 代码如下:
unlink()
16. 关闭目录
复制代码 代码如下:
closedir($handle)
17.创建目录
复制代码 代码如下:
mkdir(dirname)
18.删除目录
复制代码 代码如下:
unlink()
19.判断文件或目录是否存在
复制代码 代码如下:
bool file_exists(string filename)
20.判断文件或目录是否存在,网站空间,存在则返回真,否则返回假
格式:
复制代码 代码如下:
if(file_exists(“hello.txt”))
{
echo “文件存在”;
}
打开文件
格式:
fopen(filename,mode)
说明:按指定的格式打开指定的文件
filename:要打开的文件名
mode : 打开模式
fopen(“hello.txt”,”w”);
表示以写的方式打开hello.txt文件
写文件
格式:
fwrite(resource,string);
说明:在打开的文件中添加指定的内容
resource:打开的文件
string:要写入的内容
例:
$handle = fopen(“hello.txt”,”w”) //若a ,则可追加数据
fwrite($handle,”1\r\n”)
关闭文件
格式:
fclose($handle)
说明:关闭打开的文件
例:
复制代码 代码如下:
$handle = fopen(“hello.txt”,”w”);
fclose($handle);
读取一行数据
格式:
fgets(int handle[,int length])
说明:读取length-1个字符。若没有指定length,则默认字节为1KB,
若遇到换行、EOF或则已经读取了length-1个字符,则程序终止,
出错时候返回false;
例:
复制代码 代码如下:
$handle = fopen(“hello.txt”,”r”);
$buffer = fgets($handle,1024);
echo $handle; //输出一行信息
读取整个文件
格式:
readfile(filename)
说明:读取整个文件,并输出到浏览器
例:
复制代码 代码如下:
readfile(“hello.txt”);
?>
取文件大小
格式:
filesize(filename)
说明:获取指定文件大小,出错返回false
例:
filesize(“a.rar”)
删除文件
格式:
unlink()
说明:删除一个文件,成功则返回true,否则返回false
例:
unlink(“b.txt”)
创建目录
格式:
mkdir(dirname)
说明:创建一个目录
例:mkdir(“newfolder”); //当前目录下创建新文件夹
删除目录
格式:
rmdir(dirname)
说明:删除一个目录
例:rmdir(“newfolder”);
取得文件名
格式:
basename(filepath)
说明:从指定的路径中返回文件名
例:
basename(“c:\mytools\a.txt”) //返回a.txt
获取文件路径信息
pathinfo(path)
说明:返回文件路径信息,结果保存在数组中,网站空间,数组下标为
dirname(路径) , basename(文件名) , extension(扩展名)
例:pathinfo(“c:\mytools\a.txt”)
取绝对路径
格式:
realpath(filename)
说明:取指定文件的绝对路径,失败则返回false
例:realpath(“h.txt”) //F:\apache\example\h.txt
复制文件
格式:
copy(source,dest)
说明:将source文件复制到dest处
例:copy(“h.txt”,”newfloder\a.txt”)
判断是否是目录
格式:
is_dir(filename)
说明:判断给定文件名是否是一个目录。如果filename存在并且
为目录,香港服务器,则返回true,否则返回false.
例:
复制代码 代码如下:
if(is_dir(“newfolder”))
{
echo “是文件目录”;
}
打开目录
格式:opendir(path)
说明:打开一个指定文件目录,返回一个资源标示符
例:
$hand = opendir(“.”) //打开根目录
读取目录
格式:
readdir($handle)
说明:读取一个打开的文件目录流
readdir($hand);
关闭目录
格式:
closedir($handle)
说明:关闭一个打开的目录流
例:closedir($hand);

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