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

Question

I want to sort values of an array in alphabetical order in PHP. If all values started with same character then they should be sorted using second character and so on. Ignore case sensitive.

For Example:

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

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

I have found some algorithms but I want a way that is fast and with small number of statements. Ignoring case sensitive is special for me. Thanks.

Answer 1

You can use uasort(): http://php.net/manual/en/function.uasort.php

uasort( $arr, 'strcasecmp' );

The second argument is a function, which compares values. The function must return -1, 0, or 1. Here's a template, which you can use for your custom functions.

function cmp( $a, $b ) {
  if ( $a == $b ) return 0;
  elseif ( $a > $b ) return 1;
  elseif ( $a < $b ) return -1;
}

uasort( $arr, 'cmp' );

After sorting you might want to reset array indexes.

$arr = array_values( $arr );