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Query: Allow a seed value to be passed when using 'rand' $orderby.

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`WP_Query` allows random ordering; `'orderby' => 'rand'` translates to
`ORDER BY RAND()`. This syntax results in random ordering that is not
consistent from request to request. MySQL supports the passing of a seed value
to random sorts, such as `ORDER BY RAND(3)`, which will return the same
random value each time it's called. `WP_Query` now supports this syntax, by
passing `RAND(3)` (or whatever integer seed value you'd like) as the value
of `'orderby'`.

Props hlashbrooke.
Fixes #35692.
Built from https://develop.svn.wordpress.org/trunk@36632


git-svn-id: http://core.svn.wordpress.org/trunk@36599 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Boone Gorges 2016-02-23 16:40:26 +00:00
parent 710be9d2ba
commit ba5cc4e776
2 changed files with 13 additions and 1 deletions
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12
wp-includes/query.php
View File

@ -1467,6 +1467,7 @@ class WP_Query {
* search terms, by prepending a hyphen.
* @since 4.5.0 Removed the `$comments_popup` parameter.
* Introduced the `$comment_status` and `$ping_status` parameters.
* Introduced `RAND(x)` syntax for `$orderby`, which allows an integer seed value to random sorts.
* @access public
*
* @param string|array $query {
@ -1520,6 +1521,7 @@ class WP_Query {
* specific `$meta_query` clause, use that clause's array key.
* Default 'date'. Accepts 'none', 'name', 'author', 'date',
* 'title', 'modified', 'menu_order', 'parent', 'ID', 'rand',
* 'RAND(x)' (where 'x' is an integer seed value),
* 'comment_count', 'meta_value', 'meta_value_num', 'post__in',
* and the array keys of `$meta_query`.
* @type int $p Post ID.
@ -2332,6 +2334,14 @@ class WP_Query {
$allowed_keys = array_merge( $allowed_keys, array_keys( $meta_clauses ) );
}
// If RAND() contains a seed value, sanitize and add to allowed keys.
$rand_with_seed = false;
if ( preg_match( '/RAND\(([0-9]+)\)/i', $orderby, $matches ) ) {
$orderby = sprintf( 'RAND(%s)', intval( $matches[1] ) );
$allowed_keys[] = $orderby;
$rand_with_seed = true;
}
if ( ! in_array( $orderby, $allowed_keys, true ) ) {
return false;
}
@ -2368,6 +2378,8 @@ class WP_Query {
// $orderby corresponds to a meta_query clause.
$meta_clause = $meta_clauses[ $orderby ];
$orderby_clause = "CAST({$meta_clause['alias']}.meta_value AS {$meta_clause['cast']})";
} elseif ( $rand_with_seed ) {
$orderby_clause = $orderby;
} else {
// Default: order by post field.
$orderby_clause = "$wpdb->posts.post_" . sanitize_key( $orderby );

2
wp-includes/version.php
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@ -4,7 +4,7 @@
*
* @global string $wp_version
*/
$wp_version = '4.5-alpha-36631';
$wp_version = '4.5-alpha-36632';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.