wp meta query types code example
Example: meta_value wordpress
$meta_query_args = array(
'relation' => 'OR', // Optional, defaults to "AND"
array(
'key' => '_my_custom_key',
'value' => 'Value I am looking for',
'compare' => '='
)
);
$meta_query = new WP_Meta_Query( $meta_query_args );