How to make your own counter in PHP

It is very simple to implement a counter with PHP. The implementation of the counter is divided into two stages: one is to implement counting; the other is to implement the display of numbers; and there are two ways to implement counting: one is file-based counting. ; The second is the counting method based on the database.

1. File-based counting

<?  
if(!file_exists("visit_log/counter.txt")){  
$fp=fopen("visit_log/counter.txt","w");  
fwrite($fp,"000001"); //这里假设最大为6位，你可以根据需要修改  
$counter="000001";  
fclose($fp);  
} //检查counter.txt文件是否存在，如果不存在则新建一个文件，并且写入“00001”。  
else{  
$fp=fopen("visit_log/counter.txt","r");  
$counter=fread($fp,6);  
//-----------------------------  
$counter+=1;  
//-----------------------------  
fclose($fp);  
switch(strlen($counter)){ //将counter变量格式化，这样显得美观  
case 1:  
$counter="00000".$counter;  
break;  
case 2:  
$counter="0000".$counter;  
break;  
case 3:  
$counter="000".$counter;  
break;  
case 4:  
$counter="00".$counter;  
break;  
case 5:  
$counter="0".$counter;  
break;  
}  
$fp=fopen("visit_log/counter.txt","w");  
fwrite($fp,$counter);  
fclose($fp);  
}  
?>

2． Database-based counting

<?  
$cn=mysql_connect("localhost","root","******");  
mysql_select_db("visit_log",$cn);  
$sql="select * from visit_counter";  
$result=mysql_query($sql,$cn);  
$record=mysql_fetch_array($result);  
if(empty($visited)){  
$counter=$record["amount"]+1;  
$sql="update visit_counter set amount=$counter";  
$result=mysql_query($sql,$cn);  
}  
mysql_close($cn);  
switch(strlen($counter)){ //将counter变量格式化  
case 1:  
$counter="00000".$counter;  
break;  
case 2:  
$counter="0000".$counter;  
break;  
case 3:  
$counter="000".$counter;  
break;  
case 4:  
$counter="00".$counter;  
break;  
case 5:  
$counter="0".$counter;  
break;  
}?>

Summary:

The above two methods are used to implement the counting function. Careful netizens may see that the counter variable seems to be useless. In fact, it is the variable we use to display.

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