34

I'm wondering, in PHP, I've seen people use both these cases:

if($var === TRUE) if($var === true)

is there an actual difference between them or a coding standard/format to be used in boolean value?

Improve this question
3
  • 7
    No difference. If you want to follow the PSR-2 standard, they must be in lower case. Commented Jul 18, 2012 at 10:47
  • What about True and False? I've seen that being used and strangely the code was supposed to work, but I doubt it... Commented Nov 23, 2018 at 20:25
  • Guess, it's related with getting used to another language before becoming a PHP developer. For example in python docs, it says True and False, while in C++ you define TRUE and FALSE as constants assigned to 1 and 0 (if you don't already use stdbool.h and obey the "constants should be uppercase" rule). Commented Dec 27, 2019 at 12:00

2 Answers 2

Reset to default
54

There's no difference at all. From the docs:

To specify a boolean literal, use the keywords TRUE or FALSE. Both are case-insensitive.

According to PSR-2, as stated by both Laxus and Paul Bain in their comments, the standard is to write them in lower case.

Improve this answer
Sign up to request clarification or add additional context in comments.

1 Comment

for Developers who will read this in 2020year :) PSR-2 is deprecated now you can read PSR-12 2.5 php-fig.org/psr/psr-12
12

lowercase is generally considered a good practice, see the coloration of the lowercase on stackoverflow :)

And not related, but you should always use true first in the condition true === $var, this is a good practice to avoid sneaky bugs when mistyping the condition, eg : $var = true

Improve this answer

Comments

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.