PHP bug? Two functions with different names announced as redeclaration

Question

I need to declare two functions with different names (small 'i' and big "I").

function i() {
    echo 'Small i';
}

function I() {
    echo 'Big I';
}

PHP's output is:

PHP Fatal error:  Cannot redeclare I()

Why? Small "i" is not big "I".

I tested it in Linux and in Windows.

As far as PHP function names are concerned, `i` *is* the same as `I`. — jonrsharpe, Jan 16 '16 at 14:49
http://php.net/manual/en/functions.user-defined.php `Note: Function names are case-insensitive`... — chris85, Jan 16 '16 at 14:49
apart from that having such similar function names would lead to a horrible dx (developer experience) — JimL, Jan 16 '16 at 14:53

score 2 · Answer 1 · answered Jan 16 '16 at 14:53

PHP does not support function overloading, nor is it possible to undefine or redefine previously-declared functions.

Note: Function names are case-insensitive, though it is usually good form to call functions as they appear in their declaration.

1 Answers1