How to sort an array of UTF-8 strings?

by 
$a = array( 'Кръстев', 'Делян1', 'делян1', 'Делян2', 'делян3', 'кръстев' );
$col = new \Collator('bg_BG');
$col->asort( $a );
var_dump( $a );

Prints:

array
  2 => string 'делян1' (length=11)
  1 => string 'Делян1' (length=11)
  3 => string 'Делян2' (length=11)
  4 => string 'делян3' (length=11)
  5 => string 'кръстев' (length=14)
  0 => string 'Кръстев' (length=14)

The Collator class is defined in PECL intl extension. It is distributed with PHP 5.3 sources but might be disabled for some builds. E.g. in Debian it is in package php5-intl .

Collator::compare is useful for usort.

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