wp_update_post_meta example WordPress

Denzel Chia answers:

Hi,

What you are looking for is actually the whole example of a post meta box,
with reference to this WordPress Codex, http://codex.wordpress.org/Function_Reference/add_meta_box

I will use that as an example for you, by adding update_post_meta() to the end of the script.
Please put the below codes in your functions.php. You may need to change the HTML label.


<?php
/* Define the custom box */

// WP 3.0+
// add_action( 'add_meta_boxes', 'myplugin_add_custom_box' );

// backwards compatible
add_action( 'admin_init', 'myplugin_add_custom_box', 1 );

/* Do something with the data entered */
add_action( 'save_post', 'myplugin_save_postdata' );

/* Adds a box to the main column on the Post and Page edit screens */
function myplugin_add_custom_box() {
add_meta_box(
'myplugin_sectionid',
__( 'My Post Section Title', 'myplugin_textdomain' ),
'myplugin_inner_custom_box',
'post'
);
add_meta_box(
'myplugin_sectionid',
__( 'My Post Section Title', 'myplugin_textdomain' ),
'myplugin_inner_custom_box',
'page'
);
}

/* Prints the box content */
function myplugin_inner_custom_box() {

// Use nonce for verification
wp_nonce_field( plugin_basename( __FILE__ ), 'myplugin_noncename' );

// The actual fields for data entry
echo '<label for="myplugin_new_field">';
_e("Description for this field", 'myplugin_textdomain' );
echo '</label> ';

global $post;
$postid=$post->ID;
$value = get_post_meta($postid,'meta_key',true);

echo "<input type='text' id='myplugin_new_field' name='myplugin_new_field' value='$value' size='25' />";
}

/* When the post is saved, saves our custom data */
function myplugin_save_postdata( $post_id ) {
// verify if this is an auto save routine.
// If it is our form has not been submitted, so we dont want to do anything
if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
return;

// verify this came from the our screen and with proper authorization,
// because save_post can be triggered at other times

if ( !wp_verify_nonce( $_POST['myplugin_noncename'], plugin_basename( __FILE__ ) ) )
return;


// Check permissions
if ( 'page' == $_POST['post_type'] )
{
if ( !current_user_can( 'edit_page', $post_id ) )
return;
}
else
{
if ( !current_user_can( 'edit_post', $post_id ) )
return;
}

// OK, we're authenticated: we need to find and save the data

$mydata = $_POST['myplugin_new_field'];

global $post;
$post_id = $post->ID;

update_post_meta($post_id,'meta_key',$mydata);
}
?>


Hope there is no syntax error!

Thanks.
Denzel

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Alessendro answers:

Assuming that your form is in your single.php
The below is the form code that will post back to single.php
by leaving action blank, it will post back to itself.


<form method="post" action="">
<?php wp_nonce_field('name_of_my_action','name_of_nonce_field'); ?>
<label>This is label</label>
<input type='text' name='input1' value=' ' />
<input type='submit' value='save' />
</form>


Put this processing code at the beginning of single.php or header.php


<?php
if ( empty($_POST) || !wp_verify_nonce($_POST['name_of_nonce_field'],'name_of_my_action') )
{ //if fail nonce check, exit script
exit;
}
else
{
global $post;
$postid = $post->ID;
$data = $_POST['input1'];
update_post_meta($postid,'metakey',$data);

}
?>



To use the post meta data else where on the same template.


<?php
global $post;
$id = $post->ID;
$re_data = get_post_meta($id,'metakey',true);
echo $re_data;
?>


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