functions - Read For Learn

Define page template in wp_insert_post

From the wp_insert_post() documentation, the page_template argument reads as follow: page_template: If post_type is ‘page’, will attempt to set the page template. On failure, the function will return either a WP_Error or 0, and stop before the final actions are called. If the post_type is not ‘page’, the parameter is ignored. You can set the … Read more

Custom page with variables in url. Nice url with add_rewrite_rule

I think the add_rewrite_tag() is not needed, and can be replaced with adding the variables to the public query vars directly: // Either directly (in your init hook): $wp->add_query_var( ‘var1’ ); $wp->add_query_var( ‘var2’ ); // Or via a filter: add_filter( ‘query_vars’, ‘wpse12965_query_vars’ ); function wpse12965_query_vars( $query_vars ) { $query_vars[] = ‘var1’; $query_vars[] = ‘var2’; return … Read more

Memorizing syntax

Not everyone will follow convention, so you can be assured if you are copy-pasting then you are getting a mix-and-match approach from people who do it “right” and do it “wrong” and sometimes the difference between right and wrong is a matter of opinion, lets not forget. Also this applies to NOT only Syntax Style … Read more

Include files in child theme functions file

Child themes reference parent themes by directory name, and in a normal install all your themes live in wp-content/themes/, so I’d say it’s fine to reference those themes by their relative path: include ‘../parent-theme/some-file.php’; If that makes you uncomfortable, I observe the following constants in WordPress 3.0.1 with a twentyten child theme called tt-child: TEMPLATEPATH … Read more

Prevent “main” WPMU site_url() being returned in functions

Since “WordPress MU is no longer under active development as a separate product“, I don’t recommend using it. Instead I recommend using the setup described in this answer. It’s highly configurable you can choose what WordPress files you want on all your WordPress sites and what you want to store separately from each other WordPress … Read more

Set JPEG compression for specific custom image sizes

The ‘jpeg_quality’ filter hook functions accept two arguments: $jpeg_quality and $function which is the function from within the filter hook is fired and can be either image_resize or wp_crop_image. So there is no way to selectively set the quality of .jpeg images according to image size from this filter hook function. However, you still can … Read more

Use AJAX in shortcode

First off, this is very borderline within the scope of WPSE, it at all. Apart from the shortcode to trigger the initial HTML output, this is really just AJAX. Anyhow, that being said, this is how it’s done: The PHP Assuming that the above PHP snippet you supplied is functional, place the following in a … Read more

Trying to use add_action and do_action with parameters

You are using it wrong. add_action: attachs a function to an action hook. In your code, you are attaching alter_item funtion to admin_menu action hook. So, when admin_menu action happens, alter_item function is executed. According to codex, no parameters are passed to functions attached to admin_menu. So, the parameters your are trying to use in … Read more

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