How to make your own counters in PHP

Using PHP to implement the counter is very simple, the implementation of the counter is divided into two stages: one is to achieve the count, the second is to realize the digital display, and in the implementation of the count, there are two ways: one is based on the file count, and the second is based on the database count method.

1. File-based Count

<?  if (!file_exists ("Visit_log/counter.txt")) {  $fp =fopen ("Visit_log/counter.txt", "w");  Fwrite ($fp, "000001"); Assuming a maximum of 6 bits, you can modify  $counter = "000001" as needed;  Fclose ($FP);  } Check to see if the Counter.txt file exists, create a new file if it does not exist, and write "00001".  else{  $fp =fopen ("Visit_log/counter.txt", "R");  $counter =fread ($FP, 6);  -----------------------------  $counter +=1;  -----------------------------  fclose ($fp);  Switch (strlen ($counter)) {//counter variable is formatted so that it looks beautiful case  1:  $counter = "00000". $counter;  break;  Case 2:  $counter = "0000". $counter;  break;  Case 3:  $counter = "$". $counter;  break;  Case 4:  $counter = "xx". $counter;  break;  Case 5:  $counter = "0". $counter;  break;  }  $FP =fopen ("Visit_log/counter.txt", "w");  Fwrite ($fp, $counter);  Fclose ($FP);  }  ? >

2. Database-based Count

<?  $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)) {//counter variable is formatted case  1:  $counter = "00000". $counter;  break;  Case 2:  $counter = "0000". $counter;  break;  Case 3:  $counter = "$". $counter;  break;  Case 4:  $counter = "xx". $counter;  break;  Case 5:  $counter = "0". $counter;  break;  }? >

Summarize:

The above in two ways to achieve the Count function, careful netizen may see counter variable seems useless. It is actually the variable we use to display it.

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