UppercaseCollation.php

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<?php
class UppercaseCollation extends Collation {
 
    private $lang;
 
    public function __construct() {
        // Get a language object so that we can use the generic UTF-8 uppercase
        // function there
        $this->lang = Language::factory( 'en' );
    }
 
    public function getSortKey( $string ) {
        return $this->lang->uc( $string );
    }
 
    public function getFirstLetter( $string ) {
        if ( $string[0] == "\0" ) {
            $string = substr( $string, 1 );
        }
        return $this->lang->ucfirst( $this->lang->firstChar( $string ) );
    }
 
}