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Introduction to how to use functions to embed website traffic counters in PHP
- 黄舟Original
- 2017-10-27 09:06:591131browse
This is a way to implement a counter. If you want to see another method, please click: [PHP] Simple website visit counter implementation
If you want to see specific code ideas, please click the link above.
Create the Embed-Count folder
Create the counter.inc.php file under the Embed-Count folder with the following content:
<?php
function counter(){
$counter = 0; //初始化变量
$max_len = 8;
$lj = explode("/",$_SERVER["PHP_SELF"]);
//超全局变量$_SERVER['PHP_SELF']保存了当前运行脚本的名字 Embed_Count/al_Embed_Fn.php
$CounterFile="./counter/".$lj[count ($lj)-1].".dat";
if(!file_exists($CounterFile)){
if(!file_exists(dirname($CounterFile))){
mkdir(dirname($CounterFile),0777);
}
$cf = fopen($CounterFile,'w');
fputs($cf,'0');
fclose($cf);
}
else{
$cf = fopen($CounterFile,'r');
$counter = trim(fgets($cf,$max_len));
fclose($cf);
}
$counter++;
$cf = fopen($CounterFile,'w');
fputs($cf,$counter);
fclose($cf);
echo $counter;
}
?>In Embed-Count Create the al_Embed_Fn.php file under the folder with the following content:
<?php
include "counter.inc.php";
?>
<html>
<head>
<meta charset="UTF-8">
<title>嵌入式网页计数器-刘佳晨</title>
</head>
<body>
<p id="dd">
<span>欢迎您！</span>
<span>您是本网站的第<?php counter(); ?>位访客</span>
</p>
</body>
</html>Okay, after typing, did you find that you just encapsulated the code into a function?
Yes, but this time many new functions and tricks are used. Let me give you one by one.
Tips
1. Most PHP programmers are accustomed to naming the file extension of include or require as "inc";
2.$CounterFile="./counter/".$lj[count ($lj)-1].".dat"; Locate the counter file in the subfolder counter under the folder where the current script is located. , the file is named after the current script name plus "dat", that is, al_Embed_Fn.php.dat
3.689dc34096ff6d1e88049b4f80500954Embed the counter function into the web page, This script should be placed before the 6a74014ee44f5deb5894267f99b68016 tag; counter.inc.php is saved in the same folder as the web page, otherwise the file storage path must be specified in include
4.976f34350b40561ad1fd28d93a9cff8cCall the counter() function, which returns the value of the counter
Okay, the embedding of this function call is also done.
There are several functions that need to be mentioned here.
mkdir(dirname($CounterFile),0777): Create a directory named with the value of $CounterFlile, that is, ./counter. The access permissions of the directory are the highest permissions (readable, writable and executable);
dirname($CounterFile): Returns the directory part of the path
explode('/',$_SERVER[PHP_SELF]): Returns a string array, each The element is a substring cut out of $_SERVER[PHP_SELF] with "/" as the boundary
count($lj): counts the number of elements in the array&lj
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