The other day I ran into a situation (first time, it seems) where I needed to access a variable inside of an anonymous function inside of preg_replace_callback(). My first thought, even though it went against my better judgement was to simply define the variables as global inside of the function. No dice.
After some research, I found that you need to use the use language construct to be able to access the variables. The syntax is very straight forward:
$callback = function() use ($var1, $var2)
{
echo 'Yay! I have access to ' . $var1 . ' and ' . $var2 . '!!'
Easy peasy! I’m still pretty shocked that I only recently ran into this. Have you learned anything recently that surprised you? Comment below!
