Function and usage of img_caption_shortcode() in wordpress


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    The img_caption_shortcode function in WordPress is designed for building the output of the Caption shortcode. This function is particularly useful for plugin developers or theme designers who want to customize how image captions are displayed on a WordPress site.


    • Name: img_caption_shortcode
    • Purpose: Builds the Caption shortcode output.


    • The img_caption_shortcode function allows for the customization of caption output. It provides a filter named 'img_caption_shortcode', which passes an empty string, the attr parameter, and the content parameter values.
    • The function supports various attributes that can be used to define the appearance and behavior of the caption.
    • It is often used in plugin development or in WordPress themes to customize how captions are displayed.


    1. $attr (array, required): These are the attributes of the caption shortcode.

      • id (string): The ID of the image and caption container element, typically a <figure> or <div>.
      • caption_id (string): The ID of the caption element, typically a <figcaption> or <p>.
      • align (string): The class name that aligns the caption. Defaults to 'alignnone'. Other options include 'alignleft', 'aligncenter', 'alignright', and 'alignnone'.
      • width (int): The width of the caption in pixels.
      • caption (string): The actual text of the caption.
      • class (string): Additional class names added to the caption container for further styling.
    2. $content (string, optional): The content of the shortcode. By default, it is an empty string.


    • Type: string
    • Description: HTML content to display the caption.

    Sample Usage:

    Let's say you want to customize how captions are displayed for images in your WordPress site. You can use the img_caption_shortcode function in your theme's functions.php file or in a custom plugin.

    add_filter('img_caption_shortcode', 'custom_img_caption_shortcode', 10, 3);
    function custom_img_caption_shortcode($empty, $attr, $content) {
            'id'         => '',
            'align'      => 'alignnone',
            'width'      => '',
            'caption'    => '',
            'class'      => '',
        ), $attr));
        if (1 > (int) $width || empty($caption)) {
            return $content;
        if ($id) {
            $id = 'id="' . esc_attr($id) . '" ';
        return '<div ' . $id . 'class="custom-caption ' . esc_attr($align) . ' ' . esc_attr($class) . '" style="width: ' . (int) $width . 'px">'
        . do_shortcode($content)
        . '<p class="custom-caption-text">' . $caption . '</p>'
        . '</div>';

    In this example, the function custom_img_caption_shortcode is hooked to the img_caption_shortcode filter. It customizes the output of the caption by adding a custom class and allows for additional styling and layout changes.

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