OOHTML - Object orientated html. Build html objects using php classes and parse the object to html using the toHtml() function.

HtmlElement.class.php

<?php

/**
 * Base interface for PHP HTML elements
 *
 * Interface HtmlElement
 */
interface HtmlElement {

    /**
     * Parses the html element to a html formatted string.
     *
     * @return string
     */
    public function toHtml();
}

Input.class.php

<?php

require_once("HTMLElement.class.php");

/**
 * Class for the input html element.
 *
 * Class Input
 */
class Input implements HtmlElement {

    public $type;
    public $name;
    public $placeholder;
    public $value;

    /**
     * Constructor/initialisation
     *
     * @param string $type
     * @param string $name
     * @param string $placeholder
     * @param string $value
     */
    public function __construct($type = '', $name = '', $placeholder = '', $value = '')
    {
        $this->type = $type;
        $this->name = $name;
        $this->placeholder = $placeholder;
        $this->value = $value;
    }

    /**
     * Parses this html element to a html formatted string.
     * @return string
     */
    public function toHtml()
    {
        $html = '<input';
        $html .= ' type="' . htmlspecialchars($this->type) . '"';
        $html .= ' name="' . htmlspecialchars($this->name) . '"';
        $html .= ' placeholder="' . htmlspecialchars($this->placeholder) . '"';
        $html .= ' value="' . htmlspecialchars($this->value) . '"';
        $html .= '>';

        return $html;
    }
}

Option.class.php

<?php

require_once("HTMLElement.class.php");

/**
 * Class for the input's html element option.
 *
 * Class Option
 */
class Option implements HtmlElement {

    public $label;
    public $value;
    public $selected;
    public $disabled;

    /**
     * Constructor/initialisation
     *
     * @param string $label
     * @param string $value
     * @param bool|false $selected
     * @param bool|false $disabled
     */
    public function __construct($label = '', $value = '', $selected = false, $disabled = false)
    {
        $this->label = $label;
        $this->value = $value;
        $this->selected = $selected;
        $this->disabled = $disabled;
    }

    /**
     * Sets if the option is selected and returns the option.
     *
     * @param $selected
     * @return $this
     */
    public function isSelected($selected)
    {
        $this->selected = $selected;

        return $this;
    }

    /**
     * Parses this html element to a html formatted string.
     * @return string
     */
    public function toHtml()
    {
        $html = '<option';
        $html .= ' value="' . htmlspecialchars($this->value) . '"';
        if ($this->selected)
            $html .= ' selected';
        if ($this->disabled)
            $html .= ' disabled';
        $html .= '>';
        $html .= $this->label;
        $html .= '</option>';

        return $html;
    }

    /**
     * Sets an option to selected if the option's label
     * matches the given selected value.
     *
     * @param array $options
     * @param $selected_value
     * @return bool
     */
    static public function selectOptionWithLabel(array $options, $selected_value)
    {
        $option_selected = false;

        foreach ($options as $option)
        {
            if ($option->label == $selected_value)
            {
                $option->selected = true;
                $option_selected = true;
                break;
            }
        }

        return $option_selected;
    }

    /**
     * Sets an option to selected if the option's value
     * matches the given selected value.
     *
     * @param array $options
     * @param $selected_value
     * @return bool
     */
    static public function selectOptionWithValue(array $options, $selected_value)
    {
        $option_selected = false;

        foreach ($options as $option)
        {
            if ($option->value == $selected_value)
            {
                $option->selected = true;
                $option_selected = true;
                break;
            }
        }

        return $option_selected;
    }

    /**
     * Sets options to selected if the option's value
     * matches one of the given values in the selected values array.
     *
     * @param array $options
     * @param array $selected_values
     * @return bool
     */
    static public function selectOptionWithValues(array $options, array $selected_values)
    {
        $option_selected = false;

        foreach ($options as $option)
        {
            foreach ($selected_values as $selected_value)
            {
                if ($option->value == $selected_value)
                {
                    $option->selected = true;
                    $option_selected = true;
                }
            }
        }

        return $option_selected;
    }

    /**
     * Output options to html and concantinate to
     * build a string of html options.
     *
     * @param array $options
     * @return string
     */
    static public function optionsToHtml(array $options)
    {
        $options_html = '';

        foreach ($options as $option)
            $options_html .= $option->toHtml();

        return $options_html;
    }
}