metabox.php

<?php 

/**
* Register a meta box using a class.
*/
class Generate_Meta_Box {
    protected $name = '';
    protected $slug = '';
    protected  $post_type = array();
    protected  $fields = array();
    /**
    * Constructor.
    */
    public function __construct($arg) {
        if ( is_admin() ) {
            $this->name = $arg['meta_name'];
            $this->slug = $arg['meta_slug'];
            $this->post_type = $arg['post_type'];
            $this->fields = $arg['fields'];
            add_action( 'load-post.php',     array( $this, 'init_metabox' ) );
            add_action( 'load-post-new.php', array( $this, 'init_metabox' ) );
        }
    
    }
    
    /**
    * Meta box initialization.
    */
    public function init_metabox() {
        add_action( 'add_meta_boxes', array( $this, 'add_metabox'  )        );
        
        add_action('pre_post_update', array( $this, 'meta_box_validation' ), 99, 2);
        
        add_action('admin_notices', array( $this, 'admin_notice_handler') );
        
        add_action( 'save_post',      array( $this, 'save_metabox' ), 10, 2 );
    }
    
    /**
    * Adds the meta box.
    */
    public function add_metabox() {
        add_meta_box(
            $this->name, __( $this->name, 'textdomain' ),
            array( $this, 'render_metabox' ),
            $this->post_type,
            'advanced',
            'default'
        );
    
    }
    
    /**
    * Renders the meta box.
    */
    public function render_metabox( $post ) {
        // Add nonce for security and authentication.
        wp_nonce_field( $this->slug . '_nonce_action', $this->slug . '_nonce' );
    
        if(!empty($this->fields)){
        
            foreach($this->fields as $field) {
                $field_name = $this->slug .'_' . $field['name'];
                $field_value = get_post_meta($post->ID, $field_name, true);
            
                echo "<p>";
                echo '<label style="display: block;font-size: 11pt;text-transform: capitalize;">'.$field['name'].'</label>';
                if($field['type']=='textarea'){
            
                echo '<textarea style="width: 100%;" name="'. $field_name . '">'.$field_value.'</textarea>';
                } else if($field['type']=='media') {
            
                $url =$field_value;
                $url = html_entity_decode($url, ENT_QUOTES);
                ?>
                <input id="<?=$field_name?>" name="<?=$field_name?>" type="text" value="<?php echo $url;?>"  style="width:400px;" />
                <input id="<?=$field_name?>_upl_button" type="button" value="Upload <?=$field['name']?>" />
                <br/><img src="<?php echo $url;?>" style="width:200px;" id="<?=$field_name?>_picsrc" />
                <script>
                    jQuery(document).ready( function( $ ) {
                        jQuery('#<?=$field_name?>_upl_button').click(function() {
            
                            window.send_to_editor = function(html) {
                                imgurl = jQuery(html).attr('src')
                                jQuery('#<?=$field_name?>').val(imgurl);
                                jQuery('#<?=$field_name?>_picsrc').attr("src",imgurl);
                                tb_remove();
                            }
                            formfield = jQuery('#<?=$field_name?>').attr('name');
                            tb_show( '', 'media-upload.php?type=image&amp;TB_iframe=true' );
                            return false;
                        });
                    });
                </script>
                <?php
            
                } else {
                    echo '<input style="width:100%;" type="text" name="'. $field_name . '" value="'.$field_value.'">';
                }
                echo "</p>";
            
            
            }
        
        }
    
    }
    
        /**
         * Handles saving the meta box.
         *
         * @param int     $post_id Post ID.
         * @param WP_Post $post    Post object.
         * @return null
         */
        public function save_metabox( $post_id, $post ) {
            // Add nonce for security and authentication.
            $nonce_name   = isset( $_POST[$this->slug . '_nonce'] ) ? $_POST[$this->slug . '_nonce'] : '';
            $nonce_action = $this->slug . '_nonce_action';
    
            // Check if nonce is set.
            if ( ! isset( $nonce_name ) ) {
                return;
            }
    
            // Check if nonce is valid.
            if ( ! wp_verify_nonce( $nonce_name, $nonce_action ) ) {
                return;
            }
    
            // Check if user has permissions to save data.
            if ( ! current_user_can( 'edit_post', $post_id ) ) {
                return;
            }
    
            // Check if not an autosave.
            if ( wp_is_post_autosave( $post_id ) ) {
                return;
            }
    
            // Check if not a revision.
            if ( wp_is_post_revision( $post_id ) ) {
                return;
            }
            //print_r($_POST); die;
    
            if(!empty($this->fields)){
    
                foreach($this->fields as $field) {
                    $field_name = $this->slug .'_' . $field['name'];
                    $field_value = get_post_meta($post_id, $field_name, true);
                    //$field_value = htmlentities($field_value, ENT_QUOTES);
                    if(!isset($field_value)) {
                        add_post_meta($post_id, $field_name, htmlentities($_POST[$field_name], ENT_QUOTES));
                    } else {
                        update_post_meta($post_id, $field_name, htmlentities($_POST[$field_name], ENT_QUOTES));
                    }
                }
            }
        }
    
    
    
        public function meta_box_validation($post_id)
        {
    
            if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
                return $post_id;
            }
            if (!isset($_POST['post_type'])) {
                return $post_id;
            }
    
            if (!current_user_can('edit_posts', $post_id)) {
                return $post_id;
            }
    
            $errors = array();
    
    
            $post_type = get_post_type($post_id);
            if(!empty($this->fields) && in_array($post_type, $this->post_type)) {
    
                foreach ($this->fields as $field) {
                    $field_name = $this->slug .'_' . $field['name'];
                    $field_value = $_POST[$field_name];
    
                    if (trim($field_value) == '' && $field['required']==true) {
                        $errors[] = new WP_Error($field. '_validation_msg', 'Please enter '.$field['name'], 'error');
                    } else if($field['validate_type']=='phone' && !preg_match('/^[0-9]{10}+$/', $field_value) && $field_value!='') {
                        $errors[] = new WP_Error($field. '_validation_msg', 'Please enter valid '.$field['name'], 'error');
                    }else if($field['validate_type']=='email' && !filter_var($field_value, FILTER_VALIDATE_EMAIL) && $field_value!='') {
                        $errors[] = new WP_Error($field. '_validation_msg', 'Please enter valid email', 'error');
                    }
                }
            }
    
    
            if (!empty($errors)) {
                add_user_meta(get_current_user_id(), 'admin_notices', $errors, true);
                $url = admin_url('post.php?post=' . $post_id) . '&action=edit';
                wp_redirect($url);
                exit;
            }
            return $_POST;
        }
    
        public function admin_notice_handler()
        {
        $user_id = get_current_user_id();
        $admin_notices = get_user_meta($user_id, 'admin_notices', true);
    
        if (!empty($admin_notices)) {
        $html = '';
    
        if (is_wp_error($admin_notices[0])) {
    
        delete_user_meta($user_id, 'admin_notices');
    
        foreach ($admin_notices AS $notice) {
    
        $msgs = $notice->get_error_messages();
    
        if (!empty($msgs)) {
        $msg_type = $notice->get_error_data();
        if (!empty($notice_type)) {
            $html .= '<div class="' . $msg_type . '">';
        } else {
        $html .= '<div class="error">';
            echo "<style>";
            foreach ($this->fields as $field) {
                $field_name = $this->slug .'_' . $field['name'];
                echo "#".$field_name;
            }
            echo "</style>";
        ?>
       
    <?php }
    
    foreach ($msgs as $msg) {
        $html .= '<p><strong>' . $msg . '</strong></p>';
    }
    $html .= '</div>';
    }
    }
    }
    
    echo $html;
    }
    }
}
/*$arg = array(
   "meta_slug"=>"your_slug", // add meta box slug
   "meta_name"=>"your meta box name", // add meta box name
   "post_type"=>array("post_type"), // add post type where to show meta box
   "fields" => array(
      //array("name"=>"name", "type"=>"text", "required"=>false, "validate_type"=>"name"),
      array("name"=>"name", "type"=>"text", "required"=>false), //fields
      array("name"=>"phone", "type"=>"text", "required"=>false),//fields
      array("name"=>"email", "type"=>"text", "required"=>false)//fields
   )

);
new Generate_Meta_Box($arg);*/