Executing php code by clicking a link - php

Question

Good people i am stuck with an issue that i know has been discussed here before. I am displaying mysql data as a link and want to load more data from the database when a user clicks the link, I looked at all the previous questions and answers but i can't sort this one out. Here is how far i have managed to drag myself:
index.php:
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT topic FROM steps";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
$topic = isset($_get['topic']);
$id = isset($_get['id']);
echo ''.$row['topic'].'<br/>';
}
}
$conn->close();
?>
moreinfo.php:
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$id = isset($_get['id']);
$sql = "SELECT * FROM steps WHERE id='$id'";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
$topic = isset($_get['topic']);
echo "Description: " . $row['topic'] . "<br />";
}
}
else{
echo "123";
}
$conn->close();
?>
This doesn't give me any error, just that the hyperlinks on this line
echo ''.$row['topic'].'<br/>';
on index.php does not append an id ($id) to the hyperlink so that moreinfo.php can execute correctly.
I rily pray i'm making some sense here...

Answer 1

Use $_GET['id'] insted of $_get['id']
Correct usege of isset is looks like this
$id = isset($_GET['id'])?$_GET['id']:false
Always check if parameter which you will use next was really passed
$id = isset($_GET['id'])?$_GET['id']:false;
if(!$id)
die('id was not passed');
And last, you were overwriting variables from db with data from GET which should be on first page (probably copy and past )
$topic = isset($_get['topic']);
$id = isset($_get['id']);
here is your fixed code:
index.php
<?php
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: ".$conn->connect_error);
}
$sql = "SELECT * FROM steps";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while ($row = $result->fetch_assoc()) {
echo ''.$row['topic'].'<br/>';
}
}
$conn->close();
?>
moreinfo.php
<?php
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: ".$conn->connect_error);
}
$id = isset($_GET['id'])?$_GET['id']:false;
if(!$id)
die('id was not passed');
$sql = "SELECT * FROM steps WHERE id='$id'";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while ($row = $result->fetch_assoc()) {
$topic = isset($_get['topic']);
echo "Description: ".$row['topic']."<br />";
}
} else {
echo "123";
}
$conn->close();
?>
sql table create statement
CREATE TABLE `steps` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`topic` varchar(45) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;

Answer 2

Ok first thing first you are overwriting your id in this line
$id = isset($_get['id']);
so when you try to use it it holds bool value (true or false) instead of actual $id. And you do it in both of your files.