PHP：如何从mySQL数据库中打印值

Question

I'm using php to count the times a link is clicked.

Now, I would like to display that number, but I'm not sure how.

The database is structured like this:

CREATE TABLE IF NOT EXISTS `count_clicks` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `url` varchar(250) NOT NULL,
  `clicks` int(11) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=2;

The urls are stored in the database, and called with their id like this:

<a href="click.php?id=1">Click me</a>

Then it redirects to the url.

click.php:

// get url details based on ID
$sql = "SELECT * FROM " . $SETTINGS["data_table"] . " WHERE id='" . intval($_REQUEST["id"]) . "'";
$sql_result = mysql_query($sql, $connection) or die('request "Could not execute SQL query" ' . $sql);

// check if ID exists
if (mysql_num_rows($sql_result) > 0) {

    $item = mysql_fetch_assoc($sql_result);

    // increase clicks count by one
    $sql = "UPDATE " . $SETTINGS["data_table"] . " SET clicks=clicks+1 WHERE id='" . intval($_REQUEST["id"]) . "'";
    $sql_result = mysql_query($sql, $connection) or die('request "Could not execute SQL query" ' . $sql);

    header("Location: " . $item["url"]);

} else {
    echo "Item is missing.";
}

It works perfectly. But how do I create a php function that will allow me to echo the count for each link? I'm thinking like a function where the argument is the id - it will them return the count...

Answer 1

as i see , your are making a redirect when tou add a count, and you can compare first if is an add and make a redirect, and if is not get the counter value from database. Expect it helps

Answer 2

<?php
//new mysql connection
$pdo = new PDO('mysql:host=localhost;dbname=test', 'username', 'password');

//select
$sql = "SELECT clicks FROM count_clicks";
foreach ($pdo->query($sql) as $row) {
   echo "Klicks: ".$row['clicks']."<br />";
}
?>