Introduction to the method of PHP Web site traffic counter implementation

Simple website Traffic counter implementation, specifically as follows

First, explain the idea :

1. The user makes an access request to the server
2. The server reads the number of access files, +1, returns to the client
3. The server saves new views
4. New user access, repeat 123

Solution (main algorithm):

1. Data file: Counter.dat
2. Read the data file
Open the file;
If it does not exist, create, and take 0 as the first knowledge data;
Otherwise, read out the data;
Close the file.
3. Write the accumulated data to the file Counter.dat
accumulate data;
Open the file;
Write data;
Close the file;
4. Export the information to the Web page;
Create the Count_visitor folder.

In the Count_visitor folder, create the count_visitor.php file, and type the following code:

If necessary, you can type CSS file decorations yourself.

The variables contained in the code and their meanings

$max _len: A custom variable. The maximum number of digits of the counter;

$CounterFile: Custom variable. The file (path and file name) where the counter is stored;

$counter: Custom variable. The value of the counter;

$CF: Custom variable. Open the handle to the count file;

The functions and meanings contained in the code

File_exists ($CounterFile): Determine whether the file exists;

fopen ($CounterFile, "W"): Opens the file in write mode. (The function comes with an attribute and is created if it does not exist)

fopen ($CounterFile, ' R '): The file is opened in read-only mode.

Fgets ($CF, $max _len): reads a specified length of characters from a file

Fputs ($CF, "0"): Writes the character "0" to $CF

Fclose ($CF): Close $CF Open File

Trim (fgets ($CF, $max _len)): Removes whitespace from both sides of the removed string