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If I call get_user_meta() to retrieve a value, does WordPress cache the value? If I call get_user_meta() to retrieve the same value, does WordPress have to query the database again or is it stored in PHP memory?

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up vote 1 down vote accepted

Yes, it does. That function is a wrapper for get_metadata(). Inside of that you can find:

$meta_cache = wp_cache_get($object_id, $meta_type . '_meta');

if ( !$meta_cache ) {
    $meta_cache = update_meta_cache( $meta_type, array( $object_id ) );
    $meta_cache = $meta_cache[$object_id];
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