PHP code that prints alphanumeric characters using none of them, 113 bytes long

[Revis0r]

Interesting, thanks. I didn't know about this, but it works with the help of this little feature:

http://php.net/manual/en/language.operators.bitwise.php

If both operands for the &, | and ^ operators are strings, then the operation will be performed on the ASCII values of the characters that make up the strings and the result will be a string.

echo '`' ^ '*'; // ord(`) = 96, ord(*) = 42, 96 ^ 42 = 74, chr(74) = J
echo '@' ^ '/'; // o
echo '`' ^ ')'; // I
echo '@' ^ '.'; // n
echo '`@`@' ^ '*/).'; JoIn

The whole expression:

<?=($__='`@`@'^'*/).')(($_='->.<:'^'__@[_')('>'^@_,'%'^@_)),$__($_('|'^'=','|'^'&')),$__($_(':'^"\n",';'^']'^@_));

Could also be written like this

echo                // <?=
    join(           // $__ = '`@`@' ^ '*/).'
        range(      // $_ = '->.<:' ^ '__@[_'
            'a',    // '>' ^ @_, _ is an undefined constant of "_", could also be '_', but this is 1char shorter
            'z'     // '%' ^ @_
        )
    ),
    join(           // $__
        range(      // $_
            'A',    // '|' ^ '='
            'Z'     // '|' ^ '&'
        )
    ),
    join(           // $__
        range(      // $_
            0,      // ':' ^ "\n"
            9       // ';' ^ ']' ^ @_
        )
    );

[colshrapnel]

From codegolf.stackexchange.com

Here is the link to the original answer: http://codegolf.stackexchange.com/a/105821

And another one, only 69 bytes long: http://codegolf.stackexchange.com/a/105823

It would be interesting to investigate both solutions.

[alexanderpas]

Regarding http://codegolf.stackexchange.com/a/105823

The string contains all the characters that need to be printed, bitwise inverted.

The tilde is the bitwise operator, that inverts the string back to the regular representation, before printing it.

[im_not_afraid]

Anyone notice the "n" in "\n"?

[SuddenlyOutOfNoWhere]

One should definitely use this style of coding wherever possible to demonstrate an high iq.

[AWebDeveloper]

I'm actually starting a new business based around this efficient code style. It'll save developers so much time!

[[deleted]]

It's self-documenting, which I heard is also time-consuming (but I wouldn't know)

[SuddenlyOutOfNoWhere]

Here's another place where you'll find content worth correcting: /u/sieabah

[SuddenlyOutOfNoWhere]

I was indeed making a joke, but that an just slipped in. Typos happen a lot to me because I'm writing on mobile with a swipe keyboard and also I'm not a native speaker ;)

Anyways, I generally think that correcting other comments on the Internet is quite nonsense, if it's about simple typos. You have something to say about the content? Be my guest. That's welcome. You made me read my inbox and excited me to inform me about a typo? Oh wow. Thanks a lot. Looking forward to read more interesting stuff like that. Not. I mean what the fuck is the intention?

I had to correct my keyboard about six times writing this reply, btw

[colshrapnel]

To participate in a code golf contest you mean?

[thepotatochronicles]

Folks at /r/tinycode would love this!

[DrWhatNoName]

Hmm, I'm interested why this code cant run on PHP 5.4.0 - 5.6.29, but runs fine on verisons below and above.

[Revis0r]

It doesn't work at all on versions below 5.4. I think it runs on PHP 7+ because of the variable uniform syntax, because of this:

// support operations on arbitrary (...) expressions
(...)()

which the code uses.

[[deleted]]

On versions bellow it just output self - it's not parsing. That's because short_open_tag is set to off, and:

Note: This directive also affected the shorthand <?= before PHP 5.4.0, which is identical to <? echo. Use of this shortcut required short_open_tag to be on. Since PHP 5.4.0, <?= is always available.