[Whats make this error] PHP Notice: Use of undefined constant

I just moved to new host
In this new host i always got error_log, even with this simple php file :

<?php define(Y,120); ?>

PHP:

this is the error_log content:

i can add single quote wrapping the Y like this to fix it

<?php define('Y',120); ?>

PHP:

but there are a lot of code like that, it is better if i dont need to change the files,
but just change the hosting required, what is it actually? is it because using litespeed?

in old hosting there is cgi-fcgi information


in new hosting is using litespeed

 

The issue, what is happening is you are trying to use the constant Y which doesn't exist, so PHP converts it to a string for you. Take this for example:

<?php
define('Y', 'TEST');
define(Y, 'new');

echo TEST; // will give you new
echo Y; // will give you TEST

PHP:

What is happening is that the constant Y exists (unlike in your code) causing the creation of a new constant with the value of the Y constant (TEST).

It is not really an issue per say -you can let PHP convert those for you, but it would be best to update the code. You can create a PHP script to replace the code for you, or if you have Command Prompt access you can run a SED command to do the replaces for you.

 

Not to mention that it's just lazy coding - and bad practice. That you've not been aware of this before means that you haven't had "show errors" on while developing, which isn't really smart either - I suggest fixing your code, that is always the best practice. I don't know what you're using DEFINE for, but usually it's not something you use for anything important - personally, I use it for translations (I define a variable with different content based on language) - and that can be easily done via a loop and arrays.