This article provides a detailed analysis of PHP file operations. For more information, see
This article provides a detailed analysis of PHP file operations. For more information, see
Knowledge Point introduction:
1. Determine whether a file or directory has a bool
The Code is as follows:
File_exists (string filename)
2. Get the file name
The Code is as follows:
Basename (filepath)
3. open the file
The Code is as follows:
Fopen (filename, mode)
4. Get file path information
The Code is as follows:
Pathinfo (path)
5. Write files
The Code is as follows:
Fwrite (resource, string)
6. Take the absolute path
The Code is as follows:
Realpath (filename)
7. close the file
The Code is as follows:
Fclose ($ handle)
8. Copy an object
The Code is as follows:
Copy (source, dest)
9. Read a row of data
The Code is as follows:
Fgets (int handle [, int length])
10. Determine if it is a directory
The Code is as follows:
Is_dir (filename)
11. Read the entire file
The Code is as follows:
Readfile (filename)
12. Open the Directory
The Code is as follows:
Opendir (path)
13. Get the file size
The Code is as follows:
Filesize (filename)
14. Read the Directory
The Code is as follows:
Readdir ($ handle)
15. delete an object
The Code is as follows:
Unlink ()
16. Disable directory
The Code is as follows:
Closedir ($ handle)
17. Create a directory
The Code is as follows:
Mkdir (dirname)
18. delete a directory
The Code is as follows:
Unlink ()
19. Determine whether a file or directory exists
The Code is as follows:
Bool file_exists (string filename)
20. check whether a file or directory exists. If the website space exists, the system returns true. Otherwise, the system returns false.
Format:
The Code is as follows:
If(file_exists(“hello.txt "))
{
Echo "file exists ";
}
Open a file
Format:
Fopen (filename, mode)
Description: open a specified file in the specified format.
Filename: name of the file to be opened
Mode: Open mode
Fopen(“hello.txt "," w ");
Open the hello.txt file in the written format.
Write files
Format:
Fwrite (resource, string );
Note: add the specified content to the opened file.
Resource: Open File
String: the content to be written.
Example:
$ Handle = fopen(“hello.txt "," w ") // If a, data can be appended.
Fwrite ($ handle, "1 \ r \ n ")
Close file
Format:
Fclose ($ handle)
Disable opened files
Example:
The Code is as follows:
$ Handle = fopen(“hello.txt "," w ");
Fclose ($ handle );
Read a row of data
Format:
Fgets (int handle [, int length])
Description: Read length-1 characters. If length is not specified, the default byte is 1 kb,
If a newline, EOF, or has read length-1 characters, the program is terminated,
False is returned when an error occurs;
Example:
The Code is as follows:
$ Handle = fopen(“hello.txt "," r ");
$ Buffer = fgets ($ handle, 1024 );
Echo $ handle; // output a line of information
Read the entire file
Format:
Readfile (filename)
Description: reads the entire file and outputs it to the browser.
Example:
The Code is as follows:
Readfile(‑hello.txt ");
?>
File Size
Format:
Filesize (filename)
Description: gets the specified file size. If an error occurs, false is returned.
Example:
Filesize(+a.rar ")
Delete an object
Format:
Unlink ()
Description: if a file is deleted successfully, true is returned. Otherwise, false is returned.
Example:
Unlink(cmdb.txt ")
Create directory
Format:
Mkdir (dirname)
Creates a directory.
Example: mkdir ("newfolder"); // create a new folder in the current directory
Delete directory
Format:
Rmdir (dirname)
Deletes a directory.
For example, rmdir ("newfolder ");
Get File Name
Format:
Basename (filepath)
Returns the file name from the specified path.
Example:
Basename ("c: \ mytools \ a.txt") // returns a.txt
Get file path information
Pathinfo (path)
Returns the file path information. The result is saved in an array. The website space is indicated by the subscript of the array.
Dirname (PATH), basename (file name), extension (extension)
Example: pathinfo ("c: \ mytools \ a.txt ")
Absolute path
Format:
Realpath (filename)
Description: gets the absolute path of the specified file. If the path fails, false is returned.
Example: realpath(“h.txt ") // F: \ apache \ example \ h.txt
Copy a file
Format:
Copy (source, dest)
Note: copy the source file to dest.
Example: copy(“h.txt "," newfloder \ a.txt ")
Determine if it is a directory
Format:
Is_dir (filename)
Determines whether a given file name is a directory. If filename exists and
Is the directory, Hong Kong server, returns true, Otherwise returns false.
Example:
The Code is as follows:
If (is_dir ("newfolder "))
{
Echo "is a file directory ";
}
Open Directory
Format: opendir (path)
Description: open a specified file directory and return a resource identifier.
Example:
$ Hand = opendir (".") // open the root directory
Read directory
Format:
Readdir ($ handle)
Description: reads an open file directory stream.
Readdir ($ hand );
Close directory
Format:
Closedir ($ handle)
Disables an Open Directory stream.
Example: closedir ($ hand );
