Using JS in HTML Web pages to invoke PHP content

We often see a lot of the site's statistical code is in the form of JS call, let's look at an example below.

$countfile = "Num.txt";

Defines that the file written by the counter is num.txt under the current directory, and then we should test whether the file can be opened

if ($fp = fopen ($countfile, "r+")) = = False) {//Open file in read-write mode, exit if not open

printf ("Open file%s failed!", $countfile);

Exit

}

Else

{

If the file can be opened normally, read the data in the file, assuming it is 1

$count = Fread ($fp, 10);

Read 10-bit data

$count = $count + 1;

Fclose ($FP);

Close the current file

$fp = fopen ($countfile, "w+");

Open files in overwrite mode

Fwrite ($fp, $count);

Write new data after add 1

Fclose ($FP);

and close the file

Echo ' document.write ('. $count. ') ';

Output data in JavaScript format

}

?>

The above contents are saved to filecount.php and the Num.txt is established in the same directory.

In the HTML file, JS calls the method.