Use PHP to write counters (detailed introduction)_PHP tutorial

PHP Example Analysis: Counter
Author: Sucre_tiger
This counter uses text to count, without using a database, and can achieve the following functions:
Use a text file to count multiple pages to reduce server I/O The occupancy rate needs to be recorded in the file that needs to be recorded. Only a few lines of code need to be added.                              When requesting, their environment variable REQUEST_URI represents where it comes from... Therefore, use the environment variable REQUEST_URI of the requested file to identify which page is being viewed), and add this number to the storage. , and displayed on the computer of the user calling this page.
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 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 for later use, */
$counterData=file($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(), connecting the array $varArray with the symbol "|" and sending it back to $counterData */
/* Also used the environment variable $PATH_INFO
for($i=0;$i<=count($counterData)-1;$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 Exit the loop*/
break; >/* In this way, the I/O usage of the server is reduced to the lowest point
$data=implode("",$counterData);
/* Open the text file and write the data*/
$fp=fopen($counterFile,"w");
fputs($fp,$data);
/* If the data to be recorded is not in the text, mark $sign= Flase, then enter it in the text Add data*/
if (!$sign) {fputs($fp,"\n".$GLOBALS["REQUEST_URI"]."|"."1"."|");
print( "1");
/* Close data file*/
fclose($fp);
?>




We have seen the working process of this program and we all know the idea, but if it is written like this in every file, wouldn’t it be too troublesome.
Don’t panic! We also have PHP provided What about the powerful require() function! We write counter.php as a function, which makes it much easier 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;$i<=count($counterData)-1;$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". Let's see how we call it. Let's look at an example first:
counterTest.php
require("counter.inc");
?>





You are the 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 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 This "directory" must also 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 in different Use the require() function in the subdirectory of Not enough" error, if there is an expert please give me some advice.


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www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/316123.htmlTechArticlePHP Example Analysis: Counter Author: Sucre_tiger This counter uses text counting and does not use a database. It can achieve the following functions : Use a text file to implement multiple page count reduction services...