XmlSelect.php

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<?php
class XmlSelect {
    protected $options = [];
    protected $default = false;
    protected $tagName = 'select';
    protected $attributes = [];

    public function __construct( $name = false, $id = false, $default = false ) {
        if ( $name ) {
            $this->setAttribute( 'name', $name );
        }

        if ( $id ) {
            $this->setAttribute( 'id', $id );
        }

        if ( $default !== false ) {
            $this->default = $default;
        }
    }

    public function setDefault( $default ) {
        $this->default = $default;
    }

    public function setTagName( $tagName ) {
        $this->tagName = $tagName;
    }

    public function setAttribute( $name, $value ) {
        $this->attributes[$name] = $value;
    }

    public function getAttribute( $name ) {
        if ( isset( $this->attributes[$name] ) ) {
            return $this->attributes[$name];
        } else {
            return null;
        }
    }

    public function addOption( $label, $value = false ) {
        $value = $value !== false ? $value : $label;
        $this->options[] = [ $label => $value ];
    }

    public function addOptions( $options ) {
        $this->options[] = $options;
    }

    static function formatOptions( $options, $default = false ) {
        $data = '';

        foreach ( $options as $label => $value ) {
            if ( is_array( $value ) ) {
                $contents = self::formatOptions( $value, $default );
                $data .= Html::rawElement( 'optgroup', [ 'label' => $label ], $contents ) . "\n";
            } else {
                // If $default is an array, then the <select> probably has the multiple attribute,
                // so we should check if each $value is in $default, rather than checking if
                // $value is equal to $default.
                $selected = is_array( $default ) ? in_array( $value, $default ) : $value === $default;
                $data .= Xml::option( $label, $value, $selected ) . "\n";
            }
        }

        return $data;
    }

    public function getHTML() {
        $contents = '';

        foreach ( $this->options as $options ) {
            $contents .= self::formatOptions( $options, $this->default );
        }

        return Html::rawElement( $this->tagName, $this->attributes, rtrim( $contents ) );
    }
}