php opening link duplicate content - php

Question

So on my blog page I am using substr to display only a bit of the articles. The idea is once someone clicks one of the headings they will be sent to a page displaying the full article.
When i click the link i get the right heading in the url for example i click the 4th blog entry i will be redirected to index.php?id=4.The problem is that on this page the content remains the same, nothing changes. How do I get it so when i click the article I will be directed to a page containing only that article in full and no others. Thanks in advance guys this has been wrecking my head all day.
<?php
$dbinfo = "SELECT blog_id, title, date, body FROM content ORDER BY blog_id DESC LIMIT 0, 3";
$result = mysql_query($dbinfo) or die(mysql_error());
$return = '<p> Go Back To Content Page</p>';
if(mysql_num_rows($result) !=0):
while($row = mysql_fetch_assoc($result)){
echo '<div id="roundedbox"><h2>' . $row['title'] . ' </h2>';
echo '<div id="date"><h5><p>' . $row['date'] . '</p></h5></div>';
echo substr('<p>' . $row['body'] . '</p>',0, 90)." .... "." read more</div>";
}
else:
echo '<p> UH OOH! THERE IS NO SUCH PAGE IT DOES\'T EXIST </p>';
echo $return;
endif;
?>

Answer 1

The query you have in your code will return all the records for the table, what you want is the query to return the record based on the id parameter from the $_GET['id']. It's a good idea to make sure you're only using integers to prevent sql injection.
From your code you need to have a separate query to fetch the appropriate record using the $_GET['id'] parameter as follows...
//the parameter is set and it is an integer
if(isset($_GET['id']) && is_int($_GET['id'])) {
$blogId = (int)$_GET['id'];
$query = "SELECT blog_id, title, date, body FROM content WHERE blog_id='$blogId'";
// run query and get record data and output it
} else {
//code to return all records as list
$dbinfo = "SELECT blog_id, title, date, body FROM content ORDER BY blog_id DESC LIMIT 0, 3";
$result = mysql_query($dbinfo) or die(mysql_error());
$return = '<p> Go Back To Content Page</p>';
if(mysql_num_rows($result) !=0):
while($row = mysql_fetch_assoc($result)){
echo '<div id="roundedbox"><h2><a href="index.php?id=' . $row['blog_id'].$row['title'] . ' </a></h2>';
echo '<div id="date"><h5><p>' . $row['date'] . '</p></h5></div>';
echo substr('<p>' . $row['body'] . '</p>',0, 90)." .... "." read more</div>";
}
else:
echo '<p> UH OOH! THERE IS NO SUCH PAGE IT DOES\'T EXIST </p>';
echo $return;
endif;
}