Backend DevelopmentPHP TutorialIntroduction to the method of implementing the php website visit counterIntroduction to the method of implementing the php website visit counter
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($cf,'0'); //初始化计数器
fclose($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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