| 1 | @@ -652,6 +668,10 @@ function meta_form( $post = null ) {
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| 2 | $keys = apply_filters( 'postmeta_form_keys', null, $post );
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| 3 |
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| 4 | if ( null === $keys ) {
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| 5 | + $keys = wp_cache_get( 'postmeta_form_keys', 'posts' );
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| 6 | + }
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| 7 | +
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| 8 | + if ( ! $keys ) {
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| 9 | /**
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| 10 | * Filters the number of custom fields to retrieve for the drop-down
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| 11 | * in the Custom Fields meta box.
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| 12 | @@ -668,7 +688,10 @@ function meta_form( $post = null ) {
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| 13 | ORDER BY meta_key
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| 14 | LIMIT %d";
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| 15 | $keys = $wpdb->get_col( $wpdb->prepare( $sql, $wpdb->esc_like( '_' ) . '%', $limit ) );
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| 16 | + wp_cache_set( 'postmeta_form_keys', $keys, 'posts' );
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| 17 | }
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| 18 | +
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| 19 | + assertSame(wp_cache_get( 'postmeta_form_keys', 'posts' );, $keys)
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