PHP: How to sort values of an array in alphabetical order?

See

• natcasesort: http://www.php.net/manual/en/function.natcasesort.php
• usort: http://www.php.net/manual/en/function.usort.php with a comparator function that compares strtolower(a) and strtolower(b).

Please try to run this:

$values[0] = "programming";
$values[1] = "Stackoverflow";
$values[2] = "question";
$values[3] = "answers";
$values[4] = "AA Systems";

sort($values);

You will see that you are wrong.

Your example makes two assumptions:

1. That you are only dealing with simple, 1-dimensional arrays.

2. That after sorting alphabetically, your index will update so that the first element alphabetically will be assigned key 0 and so forth.

Given those parameters, your simplest solution is to use the array method sort(). With your example:

$values[0] = "programming";
$values[1] = "Stackoverflow";
$values[2] = "question";
$values[3] = "answers";
$values[4] = "AA Systems";

sort($values);

Which will result in the following:

Array {
     [0] => AA Systems
     [1] => answers
     [2] => programming
     [3] => question
     [4] => Stackoverflow
}

There are other array sorting functions that might be a better fit. For instance, the simple one I use above puts upper-case in front of lower-case, so if you had "security" as an item (all lower-case) it would go after "Stackoverflow" since the upper-case s would take precedence over se vs. st.