A solution to [500 (Internal Server Error)] where the linked page is blank in a well-understood PHP textbook

Sep 6, 2020 PHP a well-understood PHP textbook [500 (Internal Server Error)] the linked page is blank

Here's a quick summary of how to solve the error that the linked page goes blank while learning with a well-understood PHP textbook.

(This is an example of how to solve errors for beginners. Please note that it is a low level)

This time it was an error at the stage of “adding the delete function”, but I think it is an error that can occur in general (?)

[Error details] When I wrote the code to delete it and accessed the link set in the delete button, it turned white. Looking at the link

delete.php =? id = 18

Since it is, it seems that you can access the post you want to delete.

[Solution procedure] I didn’t know what was happening, so check with the developer tools

Looking at this “console” part …

I’m getting an error.

Failed to load resource: the server responded with a status of 500 (Internal Server Error)

When I look it up … Error on web server? I’ve come up with a lot of things like that …

[500 (Internal Server Error)]

It seems to be a pretty crisp error, and it seems difficult to identify due to various causes …

Upon further investigation, it seems that there is a code to display a more detailed error on the screen, so I wrote the following code at the beginning of delete.php.

ini_set ("display_errors", 1);
error_reporting (E_ALL);

If you describe this

<? php

ini_set ("display_errors", 1);
error_reporting (E_ALL);

session_start ();
require ('dbconnect.php');

if (isset ($ _SESSION ['id'])) {
    $ id = $ _REQUEST ['id'];

    $ messages = $ db-> prepare ('SELECT * FROM posts WHERE id =?');
    $ messages-> execute (array ($ id));
    $ message = $ messeges-> fetch ();

    if ($ message ['member_id'] == $ _SESSION ['id']) {
        $ del = $ db-> prepare ('DELETE FROM posts WHERE id =?');
        $ del-> execute (array ($ id));
    }
}

header ('Location: index.php');
exit ();
?>

Like this.

When I overwrite it and try to access the delete link again …

Somehow an error was displayed on the screen. (Exciting)

If you ask google translate to translate, Fatal error: It seems to be fatal.

And

“The 14th line of delete.php is useless!” It seems that it is said.

So if you check the 14th line of delete.php ..

Some of the messages

a → e

It was. (Is it because of you …!)

that’s all I corrected the spelling and it worked fine.

I feel that 80 to 90% of errors are misspellings. It’s the same as hitting accurately, but if you can understand the error part like this time, you can save the trouble of searching, so I want to be able to master it. Also, I felt that the error is a kind person who tells me the mistake.

The end