Display PHP code on web page - php

Question

I am creating a library for PHP scripts and I want to be able to show php code on a html webpage.
I have looked at using highlight_file(); but this will show the whole page
For example, If I have a page called code.php which has an sql query on ( select code from table where sequence = $_GET["id"] ) - example then I use
Highlight_file('code.php?id=123');
This will work but will also show the select query which I do not want to show. I would just want to show the code from the database (code column)
How can I display just the code from the database with the correct colours and formatting etc
UPDATE:
<?php
$conn=mysql_connect("localhost","charlie_library","Pathfinder0287");
mysql_select_db("charlie_library",$conn);
function highlight_code_with_id($id, $conn)
{
$query = "select * from library_php where sequence = '$id' ";
$rs = mysql_query($query,$conn);
$code = mysql_fetch_array($rs);
echo highlight_string($code["code"]);
}
// and, use it like this:
highlight_code_with_id($_GET['id'], $conn);
?>
I have tried the above code, which is just displaying the code in plain text

Answer 1

use highlight_string function, like this:
<?php
highlight_string($code);
?>
where $code is the code you have obtained from your SQL query.
You can create a function around this (something along the following lines):
<?php
function highlight_code_with_id($id, $mysqli) {
$query = $mysqli->query("select code from table where sequence = '$id'");
$code = current($query->fetch_assoc());
return highlight_string($code);
}
// and, use it like this:
echo highlight_code_with_id($_GET['id'], $mysqli);
UPDATE:
Your code is a bit incorrect, you can use:
<?php
$conn=mysql_connect("localhost","charlie_library","Pathfinder0287");
mysql_select_db("charlie_library",$conn);
function highlight_code_with_id($id)
{
$query = "select * from library_php where sequence = '$id' ";
$rs = mysql_query($query);
$code = mysql_fetch_assoc($rs); // change is in this line
echo highlight_string($code["code"]);
}
// and, use it like this:
highlight_code_with_id($_GET['id']);
?>
Note that you do not need to include $conn in your function, it can be ommitted. Also, note that you should use mysqli->* family of functions, since mysql_* family has been deprecated.

Answer 2

Perhaps this would work for you.
This post is originally for HTML, but the answer linked above shows an example using PHP.