meta_equals: Query posts based on custom meta fields where the meta key is equal to the specified value.
meta_not_equals: Query posts based on custom meta fields where the meta key is not equal to the specified value.
meta_gt: Query posts based on custom meta fields where the meta key is greater than the specified value.
meta_greater_than: Same as meta_gt.
meta_gte: Query posts based on custom meta fields where the meta key is greater than or equal to the specified value.
meta_greater_than_or_equal: Same as meta_gte.
meta_like: Query posts based on custom meta fields where the meta key is like the specified value.
meta_not_like: Query posts based on custom meta fields where the meta key is not like the specified value.
meta_lt: Query posts based on custom meta fields where the meta key is less than the specified value.
meta_less_than: Same as meta_lt.
meta_lte: Query posts based on custom meta fields where the meta key is less than or equal to the specified value.
meta_less_than_or_equal: Same as meta_lte.
meta_in: Query posts based on custom meta fields where the meta key is in the specified array of values.
meta_not_in: Query posts based on custom meta fields where the meta key is not in the specified array of values.
meta_between: Query posts based on custom meta fields where the meta key is between the specified range of values.
meta_not_between: Query posts based on custom meta fields where the meta key is not between the specified range of values.
meta_exists: Query posts based on custom meta fields where the specified meta key exists.
meta_not_exists: Query posts based on custom meta fields where the specified meta key does not exist.
meta_regexp: Query posts based on custom meta fields where the meta key matches the specified regular expression.
meta_equals_regexp: Same as meta_regexp.
meta_not_regexp: Query posts based on custom meta fields where the meta key does not match the specified regular expression.
meta_not_equals_regexp: Same as meta_not_regexp.
meta_regexp_or_like: Query posts based on custom meta fields where the meta key matches the specified regular expression or is like the specified value.
meta_equals_regexp_or_like: Same as meta_regexp_or_like.
meta_not_regexp_or_like: Query posts based on custom meta fields where the meta key does not match the specified regular expression and is not like the specified value.
meta_not_equals_regexp_or_like: Same as meta_not_regexp_or_like.