{"id":4170,"date":"2022-08-21T21:23:05","date_gmt":"2022-08-21T15:53:05","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-when-to-use-wp_query-query_posts-and-pre_get_posts\/"},"modified":"2022-08-21T21:23:05","modified_gmt":"2022-08-21T15:53:05","slug":"solved-when-to-use-wp_query-query_posts-and-pre_get_posts","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-when-to-use-wp_query-query_posts-and-pre_get_posts\/","title":{"rendered":"[Solved] When to use WP_query(), query_posts() and pre_get_posts"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-50762\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"50762\" data-parentid=\"50761\" data-score=\"161\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>You are right to say:<\/p>\n<blockquote>\n<p>Never use <code>query_posts<\/code> anymore<\/p>\n<\/blockquote>\n<h3>pre_get_posts<\/h3>\n<p><a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/codex.wordpress.org\/Plugin_API\/Action_Reference\/pre_get_posts\"><code>pre_get_posts<\/code><\/a> is a filter, for altering <strong>any<\/strong> query. It is most often used to alter only the &#8216;main query&#8217;:<\/p>\n<pre><code>add_action('pre_get_posts','wpse50761_alter_query');\nfunction wpse50761_alter_query($query){\n\n      if( $query-&gt;is_main_query() ){\n        \/\/Do something to main query\n      }\n}\n<\/code><\/pre>\n<p>(I would also check that <code>is_admin()<\/code> returns <em>false<\/em> &#8211; though this may be redundant.). The main query appears in your templates as:<\/p>\n<pre><code>if( have_posts() ):\n    while( have_posts() ): the_post();\n       \/\/The loop\n    endwhile;\nendif;\n<\/code><\/pre>\n<p>If you ever feel the need to edit this loop &#8211; use <code>pre_get_posts<\/code>. i.e. If you are tempted to use <code>query_posts()<\/code> &#8211; use <code>pre_get_posts<\/code> instead.<\/p>\n<h3>WP_Query<\/h3>\n<p>The main query is an important instance of a <a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/codex.wordpress.org\/Class_Reference\/WP_Query\"><code>WP_Query object<\/code><\/a>. WordPress uses it to decide which template to use, for example, and any arguments passed into the url (e.g. pagination) are all channelled into that instance of the <code>WP_Query<\/code> object.<\/p>\n<p>For secondary loops (e.g. in side-bars, or &#8216;related posts&#8217; lists) you&#8217;ll want to create your own separate instance of the <code>WP_Query<\/code> object. E.g. <\/p>\n<pre><code>$my_secondary_loop = new WP_Query(...);\nif( $my_secondary_loop-&gt;have_posts() ):\n    while( $my_secondary_loop-&gt;have_posts() ): $my_secondary_loop-&gt;the_post();\n       \/\/The secondary loop\n    endwhile;\nendif;\nwp_reset_postdata();\n<\/code><\/pre>\n<p>Notice <code>wp_reset_postdata();<\/code> &#8211; this is because the secondary loop will override the global <code>$post<\/code> variable which identifies the &#8216;current post&#8217;. This essentially resets that to the <code>$post<\/code> we are on.<\/p>\n<h3>get_posts()<\/h3>\n<p>This is essentially a wrapper for a separate instance of a <code>WP_Query<\/code> object. This returns an array of post objects. The methods used in the loop above are no longer available to you. This isn&#8217;t a &#8216;Loop&#8217;, simply an array of post object.<\/p>\n<pre><code>&lt;ul&gt;\n&lt;?php\nglobal $post;\n$args = array( 'numberposts' =&gt; 5, 'offset'=&gt; 1, 'category' =&gt; 1 );\n$myposts = get_posts( $args );\nforeach( $myposts as $post ) :  setup_postdata($post); ?&gt;\n    &lt;li&gt;&lt;a href=\"https:\/\/wordpress.stackexchange.com\/questions\/50761\/&lt;?php the_permalink(); ?&gt;\"&gt;&lt;?php the_title(); ?&gt;&lt;\/a&gt;&lt;\/li&gt;\n&lt;?php endforeach; wp_reset_postdata(); ?&gt;\n&lt;\/ul&gt;\n<\/code><\/pre>\n<h3>In response to your questions<\/h3>\n<ol>\n<li>Use <code>pre_get_posts<\/code> to alter your main query. Use a separate <code>WP_Query<\/code> object (method 2) for secondary loops in the template pages.<\/li>\n<li>If you want to alter the query of the main loop, use <code>pre_get_posts<\/code>. <\/li>\n<\/ol>\n<\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">13<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved When to use WP_query(), query_posts() and pre_get_posts <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You are right to say: Never use query_posts anymore pre_get_posts pre_get_posts is a filter, for altering any query. It is most often used to alter only the &#8216;main query&#8217;: add_action(&#8216;pre_get_posts&#8217;,&#8217;wpse50761_alter_query&#8217;); function wpse50761_alter_query($query){ if( $query-&gt;is_main_query() ){ \/\/Do something to main query } } (I would also check that is_admin() returns false &#8211; though this may &#8230; <a title=\"[Solved] When to use WP_query(), query_posts() and pre_get_posts\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-when-to-use-wp_query-query_posts-and-pre_get_posts\/\" aria-label=\"More on [Solved] When to use WP_query(), query_posts() and pre_get_posts\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[627],"tags":[631,635,629,628],"class_list":["post-4170","post","type-post","status-publish","format-standard","hentry","category-wordpress","tag-get-posts","tag-pre-get-posts","tag-query-posts","tag-wp-query"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] When to use WP_query(), query_posts() and pre_get_posts - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-when-to-use-wp_query-query_posts-and-pre_get_posts\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] When to use WP_query(), query_posts() and pre_get_posts - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You are right to say: Never use query_posts anymore pre_get_posts pre_get_posts is a filter, for altering any query. It is most often used to alter only the &#8216;main query&#8217;: add_action(&#039;pre_get_posts&#039;,&#039;wpse50761_alter_query&#039;); function wpse50761_alter_query($query){ if( $query-&gt;is_main_query() ){ \/\/Do something to main query } } (I would also check that is_admin() returns false &#8211; though this may ... 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It is most often used to alter only the &#8216;main query&#8217;: add_action('pre_get_posts','wpse50761_alter_query'); function wpse50761_alter_query($query){ if( $query-&gt;is_main_query() ){ \/\/Do something to main query } } (I would also check that is_admin() returns false &#8211; though this may ... 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