current community

your communities

more stack exchange communities

company blog
Stack Exchange Inbox Reputation and Badges
tour help
Programming Puzzles & Code Golf Stack Exchange is a question and answer site for programming puzzle enthusiasts and code golfers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top
up vote 3 down vote favorite

NOTE: This question was migrated from http://stackoverflow.com/q/27134588/1442685

PHP QUESTION

Almost purely out of curiousity, how can I take an array like this:

array( 'fruit' => 'banana', 'drink' => 'milk')

And convert it to an array like this:

array( 'fruit=banana', 'drink=milk')

Requirements

  • Cannot use anonymous functions
  • If needed, can only use array_* functions that accept callable if that callable is native to PHP
  • Must be a one-liner solution

This is not for a class. I'm curious to see how clever one can be with array functions. Given the requirements, is it possible?

share|improve this question
2  
Hello, welcome to PPCG :) Presumably, you want the shortest code to do this? If so, I recommend tagging your problem code-golf (Currently this lacks a winning criterion and could be closed). Consider using our sandbox for future questions. – FryAmTheEggman Nov 25 '14 at 19:34
    
Thanks @FryAmTheEggman - I've updated my tag, and am reading up on the sandbox now. – Rick Buczynski Nov 25 '14 at 19:36
1  
No problem :) Just some nit-picking, you might want to edit your title to reflect the rules i.e. "Shortest Code to translate a PHP array." You also shouldn't say "preferably"; either force one-liners, or don't. Also, just like SO, wait a while before accepting ;p – FryAmTheEggman Nov 25 '14 at 19:43
1  
This question isn't migrated: it's cross-posted, and it's already been answered on SO. – Peter Taylor Nov 25 '14 at 20:29
3  
If you want to migrate a question from one site to another within the Stack Exchange network, you should use a custom flag. But 99% of the time you should pay no attention to people on SO who say that a question would be a better fit on PPCG, because most of them have no idea what's on topic here and what isn't. – Peter Taylor Nov 25 '14 at 22:56
up vote 4 down vote accepted 
explode('&',http_build_query($a))

33 bytes

share|improve this answer
    
PHP actually has an explode function? Cool. :D – Kasran Nov 25 '14 at 19:31
2  
By the way, since this is code-golf, you should update your answer with the length of your code in bytes. Also, I think you can remove that space character ;) – FryAmTheEggman Nov 25 '14 at 20:08
    
@FryAmTheEggman. Thanks, it looks like vBuck modified it for me. New to codegolf, just copied my answer from SO tbh. :) – Devon Nov 25 '14 at 21:26
    
split is one character shorter than explode (not the same, but in this case functionally equivalent). – primo Nov 26 '14 at 0:05
1  
@isaacg, I copied it from myself lol. – Devon Nov 26 '14 at 0:46
up vote 2 down vote

PHP (33 bytes)

I am not 100% sure if this is valid.

I used 0 (zero) functions.

This solution is 1 byte shorter than @Devon's solution.

The code:

foreach($a as$k=>$v)$z[]="$k=$v";

The var $a is the array, the var $z will have the new array.

There are no restrictions to the vars or how it should be implemented.

share|improve this answer
1  
Nice solution. It does work, but @Devon's answer still takes the cake on the following grounds: 1). Easier to read; 2). It's truly a 'one-liner' solution, where your solution requires multiple lines to implement -- ie: foreach cannot be evaluated as part of an expression, and the addition of $z requires another line for assignment or use. – Rick Buczynski Nov 29 '14 at 3:12
    
I totally disagree with point 2. PHP is a free-form language (most of the whitespace don't matter) and the braces are optional for 1 expression. And the foreach can be implemented as an expression using eval('foreach($a as$k=>$v)$z[]="$k=$v";return$z;');, but DO NOT USE THIS NO MATTER WHAT! But still, I wasn't expecting to win this one: I just wanted to show another solution. But mine as the advantage of keeping a copy of the old array. – Ismael Miguel Nov 29 '14 at 3:16
    
Hmm, well that's a clever way to evaluate a loop. I'll give you that much :) If memory footprint was a requirement, I wonder how the loop + 2 arrays would stack against the consumption of @Devon's code. – Rick Buczynski Nov 29 '14 at 3:21
    
@vBuck It will consume around +1kb than the other solution. But nothing serious. About cpu cycles, mine probably would be a tiny mini bit faster. The overhead of calling 2 functions + looking for a substring + storing it's multiple parts and so on vs. a single iteration over 2 keys. – Ismael Miguel Nov 29 '14 at 3:34

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.