IdentityCollation.php

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<?php
class IdentityCollation extends Collation {
 
    private $contentLanguage;
 
    public function __construct( Language $contentLanguage ) {
        $this->contentLanguage = $contentLanguage;
    }
 
    public function getSortKey( $string ) {
        return $string;
    }
 
    public function getFirstLetter( $string ) {
        // Copied from UppercaseCollation.
        // I'm kind of unclear on when this could happen...
        if ( $string[0] == "\0" ) {
            $string = substr( $string, 1 );
        }
        return $this->contentLanguage->firstChar( $string );
    }
}