The 'Function' key is generally located on the bottom left-hand side of the keyboard with the symbol 'Fn.' This key is used in. The latter is more efficient, assuming $filter is smaller than $arr. The keys that are located on a keyboard have different functions. The 'problem' of array_filter is that it will loop over all elements of $arr, whilst array_filter and foreach only loop over $filter. " using array_filter\n\n" Įcho microtime(true) - $time. Starting from PHP 5.6, you can use the ARRAY_FILTER_USE_KEY flag in array_filter: $result = array_filter($my_array, function ($k) use ($allowed) ,Įcho microtime(true) - $time.
Here's a contrived example based upon the first, but note that I'd not recommend encoding filtering rules using $allowed this way: $my_array = Were sorry but English Community-Lenovo Community doesnt work properly without JavaScript enabled.You can also use ARRAY_FILTER_USE_BOTH to have both the value and the key passed to your filter function. $allowed could contain regex patterns instead of plain strings. Since PHP 7.4 introduced arrow functions we can make this more succinct: $my_array = Ĭlearly this isn't as elegant as array_intersect_key($my_array, array_flip($allowed)), but it does offer the additional flexibility of performing an arbitrary test against the key, e.g. You don’t have to memorize where the Function keys are located because it's right on the keys. If I press FN+CTRL then those keys work correctly, but all the other keys will activate the secondary. Just press and hold the Fn key, and then press your desired function key (e.g., F1, F2, etc.).
#HOW TO FLIP FUNCTION KEYS HOW TO#
That means that I need to press the function key if I want to type a slash. FLIP KEY CONVERSION Blank Key Removal & Reinstallation, How to replace a 2012 Ford Escape 4 Button Flip Key Remote Battery, FLIP KEY MAKING Upgrading old Boring Remote Key to FLIP KEY. PHP 5.6 introduced a third parameter to array_filter(), flag, that you can set to ARRAY_FILTER_USE_KEY to filter by key instead of value: $my_array = I suppose some glitches were to be expected for this price, but my problem is that the arrow keys are turned on by default.