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

Discussion in 'PHP' started by basketmen, Apr 10, 2015.

0
  1. #1
    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
    [​IMG]

    in new hosting is using litespeed
    [​IMG]
     
    basketmen, Apr 10, 2015 IP
  2. ThePHPMaster

    ThePHPMaster Well-Known Member

    Messages:
    737
    Likes Received:
    52
    Best Answers:
    33
    Trophy Points:
    150
    #2
    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.
     
    ThePHPMaster, Apr 10, 2015 IP
  3. PoPSiCLe

    PoPSiCLe Illustrious Member

    Messages:
    4,623
    Likes Received:
    725
    Best Answers:
    152
    Trophy Points:
    470
    #3
    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.
     
    PoPSiCLe, Apr 11, 2015 IP