Create form fields class (mini)

class-fields-utils.php

<?php


class Fields {

    static private $initialized = false;

    public static function initialize()
    {
        if (self::$initialized)
            return false;
        self::$initialized = true;
    }
    /**
     * Fields
     */
    public static function simple_field($label = '',$type = 'text', $name, $placeholder = '', $id, $class = '', $value = '')
    {
        $id = !$id ? '' : 'id="'.$id.'"';
        echo '<div>';
        echo '<label>'.$label.'</label>';
        echo '<input type="' . $type . '" name="' . $name . '" placeholder="' . $placeholder . '" ' . $id . ' class="' . $class . '" value="' . $value . '" />';
        echo '</div>';
    }

    public static function textarea_field($label = '', $name, $placeholder = '', $id, $class = '', $value = '')
    {
        $id = !$id ? '' : 'id="'.$id.'"';
        echo '<div>';
        echo '<label>'.$label.'</label>';
        echo '<textarea name="' . $name . '" placeholder="' . $placeholder . '" ' . $id . ' class="' . $class . '">' . $value . '</textarea>';
        echo '</div>';
    }

    public static function select_field($label = '', $name, $id, $class = '', $empty=true, $options = [], $selected)
    {
         $id = !$id ? '' : 'id="'.$id.'"';
        echo '<div>';
        echo '<label>'.$label.'</label>';
        echo '<select name="'.$name.'" '.$id.' class="'.$class.'">';
        if($empty) {
            echo '<option value=""> -- select option --</option>';
        }
        foreach($options as $option => $text) {
            echo '<option value="'.$option.'" '.selected( $selected, $option, false ).'>'.$text.'</option>';
        }
        echo '</select>';
        echo '</div>';
    }

    public static function checkbox_field($label,$name,$id,$class='',$value,$checked=false)
    {
         $id = !$id ? '' : 'id="'.$id.'"';
        $checked = !$checked ? '' : 'checked="checked"';
        echo '<div>';
        echo '<label>'.$label;
        echo '<input type="checkbox" value="'.$value.'" name="'.$name.'" '.$id.' class="'.$class.'" '.$checked.' />'; 
        echo '</label>';
        echo '</div>';
    }

    public static function radio_field($label,$name,$id,$class='',$value,$checked=false)
    {
         $id = !$id ? '' : 'id="'.$id.'"';
        $checked = !$checked ? '' : 'checked="checked"';
        echo '<div>';
        echo '<label>'.$label;
        echo '<input type="radio" value="'.$value.'" name="'.$name.'" '.$id.' class="'.$class.'" '.$checked.' />'; 
        echo '</label>';
        echo '</div>';
    }

    public static function button($text,$type,$name,$id,$class='',$value)
    {
        $id = !$id ? '' : 'id="'.$id.'"';
        echo '<div>';
        echo '<button type="'.$type.'" name="'.$name.'" '.$id.' class="'.$class.'">'.$value.'</button>'; 
        echo '</div>';
    }
}

Fields::initialize();

Se puede usar con Fields::simple_field($atts); por ejemplo