LanguagePl.php

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<?php
class LanguagePl extends Language {

        function convertPlural( $count, $forms ) {
                if ( !count( $forms ) ) { return ''; }
                $forms = $this->preConvertPlural( $forms, 3 );
                $count = abs( $count );
                if ( $count == 1 ) {
                        return $forms[0]; // singular
                }
                switch ( $count % 10 ) {
                        case 2:
                        case 3:
                        case 4:
                                if ( $count / 10 % 10 != 1 ) {
                                        return $forms[1]; // plural
                                }
                        default:
                                return $forms[2];   // plural genitive
                }
        }

        function commafy( $_ ) {
                if ( !preg_match( '/^\-?\d{1,4}(\.\d+)?$/', $_ ) ) {
                        return strrev( (string)preg_replace( '/(\d{3})(?=\d)(?!\d*\.)/', '$1,', strrev( $_ ) ) );
                } else {
                        return $_;
                }
        }
}