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Initialize classes array. see #7457
git-svn-id: http://svn.automattic.com/wordpress/trunk@8642 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@ -175,8 +175,11 @@ function has_excerpt( $id = 0 ) {
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function post_class( $class = '', $post_id = null ) {
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$post = get_post($post_id);
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$classes = array();
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$classes[] = $post->post_type;
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// sticky for Sticky Posts
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if ( is_sticky($post->ID) )
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$classes[] = 'sticky';
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