Collation.php

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<?php
abstract class Collation {
 
    abstract public function getSortKey( $string );
 
    public function getSortKeys( $strings ) {
        $ret = [];
        foreach ( $strings as $key => $s ) {
            $ret[$key] = $this->getSortKey( $s );
        }
        return $ret;
    }
 
    abstract public function getFirstLetter( $string );
 
}