Counter Use PHP to write counter (detailed introduction)

PHP Example Analysis: Counter
Author: Sucre_tiger
This counter uses text counting, without using a database, and can achieve the following functions:
Use a text file to count multiple pages to reduce the I/O occupancy of the server when records need to be recorded Only a few lines of code need to be added to the file. Where does it come from... So, use the environment variable REQUEST_URI of the request file to identify which page is being viewed), add this number to the user's computer, and store it. displayed on.
Please first look at the data sample recorded in my data text, (red is the number of views, and the front is the corresponding browsed file)
Counter.dat/script/s2.php|3|/script/s1.php| 11| /script/counter.php|5| /testhtml/s2.php|7|/testhtml/s3.php|6|
Now,Let's go!
counter.php

Copy the code The code is as follows:

/* Define text file to store data*/
$ counterFile="counter.dat";
/* Define a mark to identify whether the data to be recorded is already in the text data*/
$sign=False;
/* Read the data into the variable $sounterData in the form of an array Spare, */
$counterData=file($counterFile);
/* Use the count() function to calculate how many records there are */
/* Use the explode() function to separate $counterData[$i] by the symbol "|" , and send it back to the variable $varArray in the form of an array */
/* The function implode() is just the opposite of explode(), it connects the array $varArray with the symbol "|" and sends it back to $counterData */
/* Also used the environment variable $PATH_INFO
for($i=0;$i　{
　$varArray=explode("|",$counterData[$i]);
　if ($varArray[0]==$GLOBALS["REQUEST_URI"])
　　{
　　$varArray[1]++;
　　print($varArray[1]);
　　$counterData[$i]=implode(" |", $varArray);
　 $sign=True;
　　/* After finding the location of this record, use break to exit the loop*/
　　break;
　　}
　}
/* Here, use the implode() function Function, organize the data and write them together into a text file*/
/* In this way, the I/O usage of the server is reduced to the lowest point
$data=implode("",$counterData);
/* Open Text file, write data */
$fp=fopen($counterFile,"w");
fputs($fp,$data);
/* If the data to be recorded is not in the text, mark $sign= Flase , then add data to the text*/
if (!$sign) {fputs($fp,"\n".$GLOBALS["REQUEST_URI"]."|"."1"."|");
print("1");
/* Close data file*/
fclose($fp);
?>




We have seen the working of this program We all know the idea of ​​the process, but if we write it like this in every file, wouldn’t it be too troublesome? Don’t panic! We also have the powerful require() function provided by PHP! We write counter.php as a function, It is much more convenient to use. So what are you waiting for, here is the function you want:
counter.inc

Copy the code The code is as follows:

function Counter()
{
　 $counterFile="/freespace/sucre /public_html/counter.dat";
　 $counterData=file($counterFile);
　 $sign=False;
　 for($i=0;$i　　 {
$varArray=explode("|",$counterData[$i]);
　 if ($varArray[0]==$GLOBALS["REQUEST_URI"])
　　 {
　　 $varArray[1]++;
　　　 print($ varArray[1]);
　　　　 $counterData[$i]=implode("|", $varArray);
　　 $sign=True; break;
　　 }
　 }
$data=implode("",$counterData); $fp=fopen($counterFile,"w");
　 fputs($fp,$data);
　 if (!$sign)
　 {
　　 fputs($fp,"\n".$GLOBALS["REQUEST_URI"] ."|"."1"."|");
　　print("1");
　 }
　fclose($fp);
}
?>
The best way to test is "practice", okay Let's see how we call it, first look at an example:
counterTest.php
require("counter.inc");
?>





You are the counter();?> reader




You only need to add the require() function to the file header of the HTML file you want to count, and introduce the counter() function as part of the homepage. Just add counter();?> where needed.
There are a few other issues to pay attention to:
1. The file recording data must have "write" permission, usually set to "666". If the file is stored in a subdirectory, then the "directory" "You also need to have "write" permission;
2. I encountered such a problem during the debugging process. I placed counter.inc and counter.dat under a subdirectory include, and then used require in different subdirectories. () function to call, the format is as follows:     require("../include/counter.inc")
  ?>
However, the error of "insufficient permissions" always occurs. If there is an expert, please give me some advice.

The above has introduced the counter and uses PHP to write the counter (detailed introduction), including the contents of the counter. I hope it will be helpful to friends who are interested in PHP tutorials.