meta_query.php

<?php
[13-Oct-2014 20:52:36 UTC] Array
(
    [content] => Array of meta query clauses.
    [$relation] => Array
        (
            [content] => Optional. The MySQL keyword used to join the clauses of the query. Accepts 'AND', or 'OR'. Default 'AND'.
            [types] => Array
                (
                    [0] => string
                )

        )

    [0] => Array
        (
            [content] => Optional. An array of first-order clause parameters, or another fully-formed meta query.
            [types] => Array
                (
                    [0] => array
                )

            [$key] => Array
                (
                    [content] => Meta key to filter by.
                    [types] => Array
                        (
                            [0] => string
                        )

                )

            [$value] => Array
                (
                    [content] => Meta value to filter by.
                    [types] => Array
                        (
                            [0] => string
                        )

                )

            [$compare] => Array
                (
                    [content] => MySQL operator used for comparing the $value. Accepts '=', '!=', '>', '>=', '<', '<=', 'LIKE', 'NOT LIKE', 'IN', 'NOT IN', 'BETWEEN', 'NOT BETWEEN', 'REGEXP', 'NOT REGEXP', or 'RLIKE'. Default is 'IN' when `$value` is an array, '=' otherwise.
                    [types] => Array
                        (
                            [0] => string
                        )

                )

            [$type] => Array
                (
                    [content] => MySQL data type that the meta_value column will be CAST to for comparisons. Accepts 'NUMERIC', 'BINARY', 'CHAR', 'DATE', 'DATETIME', 'DECIMAL', 'SIGNED', 'TIME', or 'UNSIGNED'. Default is 'CHAR'.
                    [types] => Array
                        (
                            [0] => string
                        )

                )

        )

)