add_post_meta Multi value not working when i try to add them using loop

Question

At WordPress, I use a loop to add multiple meta values at a meta field. But every time it adds the lat value.

Here is my code:

$value = array("red", "green", "yellow")
foreach ( $value as $item ) {
    add_post_meta( $post_id, "_color", $item );
}

Every time after saving it save only yellow.

NOTE: This code works on my server but when I try to a client-server, it is behaving like this.

Wordpress Version: 4.7

Please help me.

Answer 1

Lets try by adding fourth parameter as "false".

add_post_meta( $post_id, "_color", $item, false );

I know, the fourth parameter is 'false' by default, but lets try it once, because your value is overwritten every time by the same key, therefore it is storing the last value ie "Yellow".

Answer 2

check this code:

$post_id = $post->ID;
add_post_meta($post_id, 'counter_meta', 'XYZ');
$return = get_post_meta($post_id, 'counter_meta', true );
echo '<pre>';
print_r($return);
exit();

Answer 3

Please try this

$post_id = 12;
$value = array("red", "green", "yellow")
foreach ( $value as $item ) {
    add_post_meta( $post_id, "_color", $item );
}