Wie zu speichern Hinzufügen Meta-Box woocommerce wordpress

Question

Dort möchte ich benutzerdefinierte Meta-Box in meiner Bestellung woocommerce hinzufügen. Ich habe es schon schaffen, aber da habe ich Problem, wenn ich versuche, seine doesnt ändern mein Code hier zu sparen:

add_action('add_meta_boxes', 'add_meta_boxes'); 

function add_meta_boxes() 
{ 
    add_meta_box( 
     'woocommerce-order-my-custom', 
     __('Order Driver'), 
     'order_my_custom', 
     'shop_order', 
     'side', 
     'default' 
    ); 
} 
function order_my_custom() 
{ 
    $servername = "localhost"; 
    $username = "root"; 
    $password = "no_password"; 
    $dbname = "testtable"; 

    $conn = new mysqli($servername, $username, $password, $dbname); 
    // Check connection 
    if ($conn->connect_error) { 
     die("Connection failed: " . $conn->connect_error); 
    } 

    $sql = "SELECT * FROM wp_posts WHERE post_type='drivers'"; 
    $result = $conn->query($sql); 

    if ($result->num_rows > 0) { 

    echo "<select style='width:100%;' >"; 
    echo "<option> --- Select ---</option>"; 
    while($row = $result->fetch_assoc()) { 
    echo "<option value=".$row['ID'].">".$row['post_title']."</option>"; 
    } 
    echo "</select>"; 
    } else { 
    echo "0 results"; 
} 
$conn->close(); 

} 

was soll ich jetzt tun? habe jemand mir eine lösung, damit mein code funktionieren kann wie ich will?

wenn ich benutze:

echo "<option".($selected=='')?'':'selected'." value=".$row['ID'].">".$row['post_title']."</option>"; 

Wenn ich nur:

echo "<option value=".$row['ID'].">".$row['post_title']."</option>"; 

jetzt:

Answer 1

Ihnen fehlt der Code, um die ID des ausgewählten Treibers in der Reihenfolge Meta zu speichern, während die Bestellung nach der Auswahl des Treibers gespeichert wird.

Ich habe den Code nicht getestet, hoffe aber, es hilft.

add_action('add_meta_boxes', 'add_meta_boxes'); 

function add_meta_boxes() 
{ 
    add_meta_box( 
     'woocommerce-order-my-custom', 
     __('Order Driver'), 
     'order_my_custom', 
     'shop_order', 
     'side', 
     'default' 
    ); 
} 
function order_my_custom() 
{ 
    global $woocommerce, $post; 
    $order_id =$post->ID; 
    $servername = "localhost"; 
    $username = "root"; 
    $password = "no_password"; 
    $dbname = "testtable"; 

    $conn = new mysqli($servername, $username, $password, $dbname); 
    // Check connection 
    if ($conn->connect_error) { 
     die("Connection failed: " . $conn->connect_error); 
    } 

    $sql = "SELECT * FROM wp_posts WHERE post_type='drivers'"; 
    $result = $conn->query($sql); 

    if ($result->num_rows > 0) { 
    ob_start();?> 
    <select name='order_driver' style='width:100%;' > 
    <option value=""> --- Select ---</option> 
    <?php 
    while($row = $result->fetch_assoc()) { 
     $order_driver = get_post_meta($order_id,'order_driver',true); 
    ?> 
    <option <?php echo ($row['ID']==$order_driver)?'selected':''?> value="<?php echo $row['ID']?>"><?php echo $row['post_title']?></option> 

    <?php } ?> 
    </select> 
    <?php } else {?> 
    <option value="">0 Results</option> 
    <?php } 
    echo ob_get_clean(); 
$conn->close(); 

} 

function save_drivers_meta($post_id, $post, $update) { 

    $post_type = get_post_type($post_id); 

    /* 
    * Make sure we are updating post meta only for shop orders 
    */ 
    if ("shop_order" != $post_type) return; 

    // - Update the post's order_driver value if it's set. 

    if (isset($_POST['order_driver'])) { 
     update_post_meta($post_id, 'order_driver', sanitize_text_field($_POST['order_driver'])); 
    } 
} 
add_action('save_post', 'save_drivers_meta', 10, 3);