Bits of .NET

📦 Store Extra Data with Custom Fields

Posts have limited fields. Custom fields store additional data. Any data, any type — extend WordPress power.

📝 Using Custom Fields

// functions.php
function add_custom_fields() {
    add_meta_box(
        'product_details',
        'Product Details',
        'display_product_fields',
        'product',
        'normal',
        'high'
    );
}
add_action('add_meta_boxes', 'add_custom_fields');

function display_product_fields($post) {
    $price = get_post_meta($post->ID, '_product_price', true);
    $sku = get_post_meta($post->ID, '_product_sku', true);
    $stock = get_post_meta($post->ID, '_product_stock', true);
    ?>
    

        Price: 
        
    
    

        SKU: 
        
    
    

        Stock: 
        
    
    

🎯 Working with Custom Fields

# Get custom fields
$price = get_post_meta($post_id, '_product_price', true);
$sku = get_post_meta($post_id, '_product_sku', true);
$stock = get_post_meta($post_id, '_product_stock', true);

# Set custom fields
update_post_meta($post_id, '_product_price', 99.99);
update_post_meta($post_id, '_product_sku', 'PROD-001');
update_post_meta($post_id, '_product_stock', 50);

# Add custom field (if doesn't exist)
add_post_meta($post_id, '_product_price', 99.99, true);

# Delete custom field
delete_post_meta($post_id, '_product_price');

# Get all custom fields
$all_meta = get_post_meta($post_id);
foreach ($all_meta as $key => $value) {
    echo "
$key: " . $value[0] . "
";
}

# Check if field exists
$has_price = metadata_exists('post', $post_id, '_product_price');

# Query posts by custom field
$args = array(
    'post_type' => 'product',
    'meta_query' => array(
        array(
            'key' => '_product_price',
            'value' => 100,
            'type' => 'NUMERIC',
            'compare' => '>'
        )
    )
);
$products = new WP_Query($args);

# Custom Field Use Cases
- Product prices, SKU, stock
- Event dates and locations
- Book ISBN, author, publisher
- User profile fields
- SEO meta data

💡 Custom Field Tips

• Product prices, SKU, stock
• Event dates and locations
• Book ISBN, author, publisher
• User profile fields
• SEO meta data