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This article will explain in detail how to manipulate files in PHP. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

The copy code is as follows:

$path2= "E:/myphp/text.txt"

If (! file_exists ($path2)) {

Echo "File does not exist!"

} else {

$handle1 = fopen ($path2, 'ringing') or exit ("Unable to open file")

/ / while (! feof ($handle1)) {

/ / echo fgets ($handle1).

"

/ /}

While (! feof ($handle1)) {

Echo fgetc ($handle1)

}

}

The above code illustrates a simple file read operation. Explain below:

Fopen is an open file resource.

How to use it:

$file=fopen ("welcome.txt", "r")

The first parameter is the path to the file. The latter parameter is how to open the file, which can be divided into the following types:

R read only. Start at the beginning of the file.

R + read / write. Start at the beginning of the file.

W only write. Open and empty the contents of the file; if the file does not exist, create a new file.

W + read / write. Open and empty the contents of the file; if the file does not exist, create a new file.

An add. Open and write to the end of the file, and if the file does not exist, create a new file.

A + read / append. Keep the contents of the file by writing to the end of the file.

X writes only. Create a new file. Returns FALSE if the file already exists.

X +

Read / write. Create a new file. If the file already exists, FALSE and an error are returned.

Note: if fopen () cannot open the specified file, it returns 0 (false).

The most commonly used ones are the first four.

Fgetc:

String fgetc (resource$handle)

Returns a string containing a character obtained from the file pointed to by handle. If you encounter EOF, return FALSE.

Fgets:

String fgets (int$handle [, int$length])

Reads a line from the file pointed to by handle and returns a string up to length-1 bytes in length. Encounter a newline character (included in the return value), EOF, or stop after reading the length-1 byte (see which case occurs first). If no length is specified, the default is 1K, or 1024 bytes.

Return FALSE if there is an error.

Fgetss:

String fgetss (resource$handle [, int$length [, string$allowable_tags]])

Same as fgets (), except that fgetss tries to remove any HTML and PHP tags from the read text. (same as fgets (), except that he filters the tags of html and php.)

You can use the optional third parameter to specify which tags are not removed.

The feof () function detects whether the end of the file (eof) has been reached.

/ / determine whether a file or directory exists

Bool file_exists (string filename)

Determine whether a file or directory exists. If it exists, it returns true, otherwise it returns false.

Format:

The copy code is as follows:

If (file_exists ("hello.txt"))

{

Echo "File exists"

}

/ / Open the file

Format:

Fopen (filename,mode)

Description: opens the specified file in the specified format

Filename: name of the file to open

Mode: open mode

Fopen ("hello.txt", "w")

Means to open the hello.txt file by writing

/ / write a file

Format:

Fwrite (resource,string)

Description: add the specified content to the open file

Resource: open fil

String: what to write

Example:

$handle = fopen ("hello.txt", "w") / / if a, data can be appended

Fwrite ($handle, "1\ r\ n")

/ / close the file

Format:

Fclose ($handle)

Description: close open files

Example:

$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 1KB

If a newline, EOF, or length-1 characters have been read, the program terminates

Return false if there is an error

Example:

$handle = fopen ("hello.txt", "r")

$buffer = fgets ($handle,1024)

Echo $handle; / / output one line of information

/ / read the entire file

Format:

Readfile (filename)

Description: read the entire file and export it to the browser

Example:

/ / fetch file size

Format:

Filesize (filename)

Description: get the specified file size, return false if there is an error

Example:

Filesize ("a.rar")

/ / Delete files

Format:

Unlink ()

Description: delete a file, return true if successful, otherwise return false

Example:

Unlink ("b.txt")

/ / create a directory

Format:

Mkdir (dirname)

Description: create a directory

Example: mkdir ("newfolder"); / / create a new folder under the current directory

/ / Delete the directory

Format:

Rmdir (dirname)

Description: delete a directory

Example: rmdir ("newfolder")

/ / get the file name

Format:

Basename (filepath)

Description: returns the file name from the specified path

Example:

Basename ("c:\ mytools\ a.txt") / / returns a.txt

/ / get file path information

Pathinfo (path)

Description: returns the file path information, the result is saved in the array, and the array index is

Dirname (path), basename (file name), extension (extension)

Example: pathinfo ("c:\ mytools\ a.txt")

/ / take absolute path

Format:

Realpath (filename)

Description: takes the absolute path of the specified file, and returns false if it fails.

Example: realpath ("h.txt") / / F:\ apache\ example\ h.txt

/ / copy the file

Format:

Copy (source,dest)

Description: copy the source file to dest

Example: copy ("h.txt", "newfloder\ a.txt")

/ / determine whether it is a directory or not

Format:

Is_dir (filename)

Description: determine whether a given file name is a directory. If filename exists and

Is a directory, true is returned, otherwise false.

Example:

The copy code is as follows:

If (is_dir ("newfolder"))

{

Echo "is a file directory"

}

/ / Open the directory

Format: opendir (path)

Description: opens a specified file directory and returns a resource identifier

Example:

$hand = opendir (".") / / Open the root directory

/ / read the directory

Format:

Readdir ($handle)

Description: read an open file directory stream

Readdir ($hand)

/ / close the directory

Format:

Closedir ($handle)

Description: close an open directory stream

Example: closedir ($hand)

This is the end of this article on "how to operate files in PHP". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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