Php-mysql Course

The counterUrl() function presented in this page can be used to make a counter for the number of visits of your web site pages, with data (URL of each accessed page, number of visits) stored into a text file on server, in JSON format.
- The function returns an array with: ['p'=>page_address, 'v'=>nr_visits]. For other details and usage, see the comments in code.
- Click to select it.
/* PHP Script Counter Page Visits (PHP 5.4+) /from: https://coursesweb.net/
- Counter data is saved in JSON format into a text file on server
- Create a file on your server with the name added in $file_json, and permissions CHMOD 0755 (or 0777)
*/

// HERE add the path and Name of the file where to save the counter data
$file_json = 'count_url.json';

//function to get and save a Counter for accessed pages
//receives the page address, and the address of the file where to save data (in json format)
//returns array with: ['p':page_address, 'v':nr_visits]
function counterUrl($p, $f){
  $url_c = ['p'=>$p, 'v'=>0];  //counter of current accessed page

  //if $file_json exists, gets is data into an array
  $ar_c = file_exists($f) ? json_decode(file_get_contents($f), true) :[];

  //if array $ar_c, traverse it, checks if current $pg_url is saved and increments its counter
  if(is_array($ar_c)){
    $nr = count($ar_c);
    for($i=0; $i<$nr; $i++){
      if($ar_c[$i]['p'] == $url_c['p']) {
        //store counter of current url, remove this item from array
        $url_c['v'] = $ar_c[$i]['v'];
        unset($ar_c[$i]);
        $ar_c = array_values($ar_c);
        break;
      }
    }
  }

  //increment counter and save data in json file (show error message if unable to save)
  $url_c['v']++;
  $ar_c[] = $url_c;
  if(!file_put_contents($f, json_encode($ar_c))) echo 'Unable to save data in: '. $f;
  return $url_c;
}

//Usage of the function, output the current page-address (without domain name) and number of visits
$url_c = counterUrl($_SERVER['REQUEST_URI'], $file_json);
echo 'Page: '. $url_c['p'] .' - Visits: '. $url_c['v'];
// Output: Page: /php-mysql/counter-page-visits_cs - Visits: 89

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
What attribute makes an option from <select> selected?
checked="checked" selected="selected" disabled="disabled"
<select name="a_name">
 <option value="val1">Option 1</option>
 <option value="val2" selected="selected">Option 2</option>
</select>
What CSS value allows to create color gradients for background?
contain repeat-x linear-gradient
#id {
  background: linear-gradient(top left, #1f1, #fff, #11f);
}
What statement creates an array in JavaScript?
[] {} new Object()
var arr = [1, "CoursesWeb.net", "MarPlo.net"];
alert(arr[2]);
Indicate the PHP function used to redirect to other page.
function() header() switch()
header("Location: http://coursesweb.net/");
exit;
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