How to save custom meta boxes in Wordpress - php

Question

I've been trying to get my custom meta box data to save in Wordpress, and I haven't had any luck. I've tried researching other posts, but since everyone does it a little bit differently, I haven't had any success at using the tutorials and other posts out there.
I created a metabox:
add_action( 'add_meta_boxes', 'ic_add_heading_box' );
function ic_add_heading_box( $post ) {
add_meta_box(
'Meta Box',
'Heading Titles',
'ic_heading_box_content',
'page',
'normal',
'high'
);
}
function ic_heading_box_content( $post ) {
echo '<label>Main Heading (h1)</label>';
echo '<input type="text" name="heading_box_h1" value="" />';
echo '<label>Sub Heading (h3)</label>';
echo '<input type="text" name="heading_box_h3" value="" />';
}
I just can't for the life of me get the data I insert in to the fields to save in Wordpress. Any help would be greatly appreciated.

Answer 1

The function you are using is only a display function.
You are not actually doing nothing with the data . it is only for creating the metabox. not handling it.
You need to add
add_action( 'save_post', 'myplugin_save_postdata' );
and then use update_post_meta() with a function like in the codex example :
function myplugin_save_postdata( $post_id ) {
// If this is an autosave, our form has not been submitted, so we don't want to do anything.
if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
return $post_id;
// Check the user's permissions. If want
if ( 'page' == $_POST['post_type'] ) {
if ( ! current_user_can( 'edit_page', $post_id ) )
return $post_id;
} else {
if ( ! current_user_can( 'edit_post', $post_id ) )
return $post_id;
}
/* OK, its safe for us to save the data now. */
// Sanitize user input. if you want
$mydata = sanitize_text_field( $_POST['myplugin_new_field'] );
// Update the meta field in the database.
update_post_meta( $post_id, '_my_meta_value_key', $mydata ); // choose field name
}