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Introduction to the method of implementing the php website visit counter

黄舟Original: 2017-10-27 09:12:141426browse

Simple website visit counter implementation, the details are as follows

First explainIdea:

1. The user issues an access request to the server
2 .The server reads the access count file, +1, and returns to the client
3. The server saves the new number of views
4. When a new user visits, repeat 123

Solution (Main algorithm):

1. Data file: counter.dat
2. Read data file
Open the file;
If it does not exist, create it and Use 0 as the initial data;
Otherwise, read 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. Output 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:

<html>
<head>
 <meta charset="UTF-8">
 <title>浏览计数器-ljccccccccccc@163.com</title>
</head>
<body>
 <?php
  //数字输出网页计数器
  $max_len = 9;
  $CounterFile = "counter.dat";
  if(!file_exists($CounterFile)){  //如果计数器文件不存在
   $counter = 0;     
   $cf = fopen($CounterFile,"w"); //打开文件
   fputs($cf,&#39;0&#39;);     //初始化计数器
   fclose($cf);     //关闭文件
  }
  else{          //取回当前计数器的值
   $cf = fopen($CounterFile,"r");
   $counter = trim(fgets($cf,$max_len));
   fclose($cf);
  }
  $counter++;         //计数器加一
  $cf = fopen($CounterFile,"w");    //写入新的数据
  fputs($cf,$counter);
  fclose($cf);
 ?>
 <p id="dd" align="center">
  <span>欢迎您!</span>
  <span>您是本站的第
   <?php
    echo $counter;       //输出计数器
   ?>
  位访客！</span>
 </p>

</body>
</html>

If necessary, you can type the css file decoration yourself.

Contained in the code Variables and their meanings

$max_len: Define variables from . The maximum number of digits in the counter;

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

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

$cf: custom variable. Open the handle of the counting file;

Functions and meanings contained in the code

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

fopen($CounterFile,"w" ) : Open the file for writing. (The function comes with attribute, if it does not exist, it will be created)

fopen($CounterFile,'r'): Open the file in read-only mode.

fgets($cf,$max_len) : Read characters of specified length from the file

fputs($cf,”0”) : Write character “0” into $cf

fclose($cf): Close the file opened by $cf

trim(fgets($cf,$max_len)): Remove the spaces on both sides of the string

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