LanguageEs.php

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<?php
class LanguageEs extends Language {

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