Get product custom attribute Woocommerce - wordpress

Question

I have a single product custom variation table template in functions.php and I'm trying to get product custom attribute. I have two them (date and location).
I'm found a lot of solutions, but none didn't work for me.
Woocommerce version 3.2.6.
With this code below I get
Notice: Only variables should be passed by reference.
And I get type 'Null' of $date.
<td class="date">
<?php
$product_id = method_exists( $product, 'get_id' ) ? $product->get_id() : $product->id;
$date = array_shift( wc_get_product_terms( $product_id, 'pa_date', array( 'fields' => 'names' ) ) );
?>
</td>
This is my full product variation table code in function.php
function woocommerce_variable_add_to_cart(){
global $product, $post, $woocommerce;
$attributes = $product->get_attributes();
$variations = find_valid_variations();
// Check if the special 'price_grid' meta is set, if it is, load the default template:
if ( get_post_meta($post->ID, 'price_grid', true) ) {
wp_enqueue_script( 'wc-add-to-cart-variation' );
wc_get_template( 'single-product/add-to-cart/variable.php', array(
'available_variations' => $product->get_available_variations(),
'attributes' => $product->get_variation_attributes(),
'selected_attributes' => $product->get_variation_default_attributes()
) );
return;
}
?>
<table class="variations variations-grid" cellspacing="0">
<thead>
<tr>
<td> Date | Location </td>
<td> Price </td>
<td> Quantity </td>
<td> Availability </td>
<td> </td>
</tr>
</thead>
<tbody>
<?php
foreach ($variations as $key => $value) {
if( !$value['variation_is_visible'] ) continue;
?>
<tr>
<td class="date">
<?php
$product_id = method_exists( $product, 'get_id' ) ? $product->get_id() : $product->id; // Added WC 3+ support
$date = array_shift( wc_get_product_terms( $product_id, 'pa_date', array( 'fields' => 'names' ) ) );
?>
</td>
<td class="price">
<?php echo '<span>£</span>' . $product->get_price(); ?>
</td>
<td class="quantity">
<?php woocommerce_quantity_input(); ?>
</td>
<td class="stock">
<?php if (!$value['is_in_stock'] ) { ?>
<p class="stock out-of-stock"><?php _e( 'Places Not Available', 'woocommerce' ); ?></p>
<?php } else { ?>
<p class="stock in-stock"><?php _e( 'Places Available', 'woocommerce' ); ?></p>
</td>
<td class="add-to-cart">
<form class="cart" action="<?php echo esc_url( $product->add_to_cart_url() ); ?>" method="post" enctype='multipart/form-data'>
<?php
if(!empty($value['attributes'])){
foreach ($value['attributes'] as $attr_key => $attr_value) {
?>
<input type="hidden" name="<?php echo $attr_key?>" value="<?php echo $attr_value?>">
<?php
}
}
?>
<button type="submit" class="single_add_to_cart_button button alt"><span class="glyphicon glyphicon-tag"></span> Add to cart</button>
<input type="hidden" name="variation_id" value="<?php echo $value['variation_id']?>" />
<input type="hidden" name="product_id" value="<?php echo esc_attr( $post->ID ); ?>" />
<input type="hidden" name="add-to-cart" value="<?php echo esc_attr( $post->ID ); ?>" />
</form>
<?php } ?>
</td>
</tr>
<?php } ?>
</tbody>
</table>
<?php
}
function find_valid_variations() {
global $product;
$variations = $product->get_available_variations();
$attributes = $product->get_attributes();
$new_variants = array();
foreach( $variations as $variation ) {
// Peruse the attributes.
// 1. If both are explicitly set, this is a valid variation
// 2. If one is not set, that means any, and we must 'create' the rest.
$valid = true; // so far
foreach( $attributes as $slug => $args ) {
if( array_key_exists("attribute_$slug", $variation['attributes']) && !empty($variation['attributes']["attribute_$slug"]) ) {
// Exists
} else {
// Not exists, create
$valid = false; // it contains 'anys'
foreach( explode( '|', $attributes[$slug]['value']) as $attribute ) {
$attribute = trim( $attribute );
$new_variant = $variation;
$new_variant['attributes']["attribute_$slug"] = $attribute;
$new_variants[] = $new_variant;
}
}
}
// This contains ALL set attributes, and is itself a 'valid' variation.
if( $valid )
$new_variants[] = $variation;
}
return $new_variants;
}
UPDATE
I got this code working, but I get both attribute values (date location) in one tag.
How to seperate attributes?
<td>
<?php
foreach($value['attributes'] as $key => $val ) {
$val = str_replace(array('-','_'), ' ', $val);
printf( '<span class="attr attr-%s">%s</span>', $key, ucwords($val) );
}
?>
</td>
UPDATE
Finally I get date and location but with extra warnings, notices, and single characters.
Code
<?php
foreach($value as $date ) {
printf($date['attribute_date']);
}
?>
** SOLVED **
Maybe not the best method, but it's working.
<td class="date">
<?php
$i = 0;
foreach($value['attributes'] as $key => $val ) {
if($i == 0 ) {
echo $val;
}
$i++;
}
?>
</td>
<td class="location">
<?php
$i = 0;
foreach($value['attributes'] as $key => $val ) {
if($i !== 0) {
echo $val;
}
$i++;
}
?>
</td>

Answer 1

Use the method get_attributes() and function wc_get_product_terms() described here
<?php
// Get the attributes
$attributes = $product->get_attributes();
// Start the loop
foreach ( $attributes as $attribute ) : ?>
<?php
// Check and output, adopted from /templates/single-product/product-attributes.php
if ( $attribute['is_taxonomy'] ) {
$values = wc_get_product_terms( $product->id, $attribute['name'], array( 'fields' => 'names' ) );
echo apply_filters( 'woocommerce_attribute', wpautop( wptexturize( implode( ', ', $values ) ) ), $attribute, $values );
} else {
// Convert pipes to commas and display values
$values = array_map( 'trim', explode( WC_DELIMITER, $attribute['value'] ) );
echo apply_filters( 'woocommerce_attribute', wpautop( wptexturize( implode( ', ', $values ) ) ), $attribute, $values );
}
?>
<?php endforeach; ?>
If you look at the template \templates\single-product\product-attributes.php you can see how to get the individual attribute names.
if ( $attribute->is_taxonomy() ) {
$attribute_taxonomy = $attribute->get_taxonomy_object();
$attribute_values = wc_get_product_terms( $product->get_id(), $attribute->get_name(), array( 'fields' => 'all' ) );
foreach ( $attribute_values as $attribute_value ) {
$value_name = esc_html( $attribute_value->name );
if ( $attribute_taxonomy->attribute_public ) {
$values[] = '' . $value_name . '';
} else {
$values[] = $value_name;
}
}
}

Answer 2

Here's how to get specific Custom Attribute:
// Get the custom attribute
$svd_attribute = array_shift( wc_get_product_terms( $product->id, 'your_custom_attribute', array( 'fields' => 'names' ) ) );
// Display if String
if ( is_string( $svd_attribute ) ) {
echo wp_kses_post( "$svd_attribute" );
}
Just replace "your_custom_attribute"
Working on WooCommerce: 3.8.0