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Edit File: AppendAForm.php

<?php if ( ! defined( 'ABSPATH' ) ) exit;

final class NF_Admin_Metaboxes_AppendAForm extends NF_Abstracts_Metabox
{
    protected $_post_types = array( 'post', 'page' );

public function __construct()
    {
        parent::__construct();

$this->_title = esc_html__( 'Append a Ninja Form', 'ninja-forms' );

add_filter( 'the_content', array( $this, 'append_form' ) );
    }

public function append_form( $content )
    {
        if ( isset( $GLOBALS[ 'post' ] ) ) {
            $post = $GLOBALS[ 'post' ];
        } else {
            $post = NULL;
        }

if( ! $post || ! is_object( $post ) || post_password_required($post) ) return $content;

$form_id = get_post_meta( $post->ID, 'ninja_forms_form', TRUE );

if( ! $form_id ) return $content;

return $content . "[ninja_forms id=$form_id]";
    }

public function save_post( $post_id )
    {
        if (
            defined('DOING_AUTOSAVE') && DOING_AUTOSAVE
            || ! isset( $_POST['nf_append_form'] )
            || ! wp_verify_nonce( $_POST['nf_append_form'], 'ninja_forms_append_form' )
            || ( 'page' == $_POST['post_type'] && !current_user_can( 'edit_page', $post_id ) )
            || ( 'post' == $_POST['post_type'] && !current_user_can( 'edit_post', $post_id ) )
        ) return $post_id;

$post_id = absint( $post_id );

$form_id = absint( $_POST['ninja_form_select'] );

if ( empty ( $form_id ) ) {
            delete_post_meta( $post_id, 'ninja_forms_form' );
        } else {
            update_post_meta( $post_id, 'ninja_forms_form', $form_id );
        }
    }

public function render_metabox( $post, $metabox )
    {
        wp_nonce_field( 'ninja_forms_append_form', 'nf_append_form' );

$forms = Ninja_Forms()->form()->get_forms();

$form_id = get_post_meta( $post->ID, 'ninja_forms_form', true );

$none_text = '-- ' . esc_html__( 'None', 'ninja-forms' );

Ninja_Forms()->template( 'admin-metabox-append-a-form.html.php', compact( 'forms', 'form_id', 'none_text' ) );
    }
}

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