What's the best way to determine the first key in a possibly associative array? My first thought it to just foreach the array and then immediately breaking it, like this:
foreach ($an_array as $key => $val) break;
Thus having $key contain the first key, but this seems inefficient. Does anyone have a better solution?
Best Answer
2019 Update
Starting from PHP 7.3, there is a new built in function called
array_key_first()
which will retrieve the first key from the given array without resetting the internal pointer. Check out the documentation for more info.You can use
reset
andkey
:It's essentially the same as your initial code, but with a little less overhead, and it's more obvious what is happening.
Just remember to call
reset
, or you may get any of the keys in the array. You can also useend
instead ofreset
to get the last key.If you wanted the key to get the first value,
reset
actually returns it:There is one special case to watch out for though (so check the length of the array first):