Sort array not working - php

Question

I am trying to sort array alphabetically using php sort function.
Array ( [0] => Open Sans [1] => Wellfleet [2] => Rambla [3] => Dosis [4] => Noto Sans [5] => Domine [6] => Signika Negative [7] => Arvo [8] => Neuton [9] => Rufina [10] => Tinos [11] => Podkova [12] => Magra [13] => Bitter [14] => Anton [15] => Libre Baskerville [16] => Tienne [17] => Roboto [18] => Ruda [19] => Merriweather [20] => Amaranth [21] => Playfair Display SC [22] => Cinzel Decorative [23] => Nobile [24] => Volkhov [25] => Nunito [26] => Merriweather Sans [27] => Stardos Stencil [28] => Bree Serif )
I have tried this one
$heading_fonts = sort($heading_fonts);
Eventually I am combining array to get same key and value.
$heading_fonts = array_combine($heading_fonts, $heading_fonts);
But giving me an error.
Warning: array_combine() expects parameter 1 to be array, boolean given in...
Any idea how can I sort an array to work?

Answer 1

The sort function will sort your array in place and return a boolean value indicating its success. You should not assign its return value to the array. Use just:
sort($heading_fonts);

Answer 2

Learn to use the documentation:
bool sort ( array &$array [, int $sort_flags = SORT_REGULAR ] )
Notice the ampersand (&) in-front of the $array parameter. The ampersand is a reference operator.
It is also important to always take note of a function's return value. Many questions here on SO can be solved simply by finding out what a function actually does, and what it returns.
Return Values
Returns TRUE on success or FALSE on failure.
So, this is how you sort an array:
$someArray = array(8,2,6,1,0);
sort($someArray);
// $someArray is now sorted
If you assign the return value to $someArray, like this:
$someArray = array(8,2,6,1,0);
$someArray = sort($someArray);
...then $someArray is overwritten by the sort() function's return value (which would be TRUE in this case).
The "Examples" section of the documentation is also very instructive.