CODEWITHSUNDEEP
phplambda
Rok Kralj
Rok Kralj

Reputation: 48755

PHP bug (lambda function with use)

I think I stumbled across a bug in PHP. However, to be sure, I am asking here first.

$k=0;
echo preg_replace_callback('/./', function($groups) use ($k) {
    return $k++;
}, 'xxxxxx');

Script output: 000000

Expected output: 012345

Am I missing something?

Upvotes: 0

Views: 94

Answers (2)

Madara's Ghost
Madara's Ghost

Reputation: 174987

The anonymous function is called every time a match is found, the state of $k is not preserved during (hence, the closure).

Try passing it by reference, or use a global.

Upvotes: 2

NikiC
NikiC

Reputation: 101936

$k is bound to the closure by value, not by reference. So it will always be the same between multiple closure calls.

You can also pass it by reference using &$k. Note that this will also modify the $k value outside the closure.

Upvotes: 8

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