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最简单的PHP程序--记数器

Jun 13, 2016 pm 12:40 PM
php user principle device file Browse of program read database

原理:  
1.第一位使用者浏览某页。
2.伺服器程式从资料库或档案中读取该页被浏览次数。
3.将次数加一储存,并将它送回第一位使用者。
4.第二位使用者浏览某页。
5.伺服器程式从资料库或档案中读取该页被浏览次数。
6.将次数再加一储存,并将它送回第二位使用者。   
需要了解的函数:  
fopen()打开文件
filesize()获得文件大小
fseek()移动文件指针
fgets()得到文件指针所在行内容
fputs()将字串写如文件指针所在位置
fclose()关闭文件
file_exists()判断文件是否存在
exec()执行外部程序  

最简单的记数器:  
  

  
访客计数器 原型  
  
  
/*  
(c)1998 David W. Bettis  
这里是版权信息  
*/  

$counterFile = "counter.txt";  
#这里是定义记数器文件

function displayCounter($counterFile) {  
$fp = fopen($counterFile,"rw");
#打开文件,用读写方式

$num = fgets($fp,5);
#取得当前数字

$num += 1;
#加1

print "您是第 "."$num"." 位无聊份子";  
exec( "rm -rf $counterFile");  
exec( "echo $num > $counterFile");  
#偷懒的方式哦,不使用fputs写入  
}  

if (!file_exists($counterFile)) {  
exec( "echo 0 > $counterFile");  
}#如果记数器文件不存在,新建它并设置内容为0

displayCounter($counterFile);  

?>  
  
   
PHP记数器比较简单版:  

#版权没有啦,这么简单  

$fp=fopen("counter.txt","r+");
flock($fp,3);  
#打开记数器文件并锁住

$fsize=filesize("count.txt");
$count=fgets($fp,$fsize+1);
$count++;  
#取得数码并加一

fseek($fp,0);
fputs($fp,$count);
fclose($fp);
#将新数码写入文件

echo "你是第 $count 位访问者";
?>  

PHP记数器图形版:  
制作10个图片,将数字串用图片组起来,我就不细说了
假设图片为0.gif ~ 9.gif


....$count为取得的数值
$strcount=strval($count);
$strcount=chop($strcount);
$countlen=$strlen($strcount);
$shtml="";
for ($i=0; $i$shtml.="最简单的PHP程序--记数器";
}
echo $shtml;
?>  

PHP记数器数据库版:  
使用SQL记数器,先建好表
CREATE TABLE counter
(
counter int not null,
id int not null
)
INSERT INTO counter(counter,id) VALUE(0,1)


$conn=mysql_connect(..., ..., ...);
#MySQL数据库连接

$sql="select * from counter";
$result=mysql_query($sql,$conn);
$objresult=mysql_fetch_object($result);
$count=$objresult->counter;
$count++;  

$sql="update counter set counter=".$count."where id=1";
mysql_query($sql,$conn);
mysql_close($conn);


echo "你是第$count位访客";
?> 
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