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Description

Builds the Caption shortcode output.

Allows a plugin to replace the content that would otherwise be returned. The filter is img_caption_shortcode and passes an empty string, the attr parameter and the content parameter values. The supported attributes for the shortcode are 'id', 'caption_id', 'align', 'width', 'caption', and 'class'.

Usage

$string = img_caption_shortcode( $attr, $content );

Parameters

$attr

( array ) required – { Attributes of the caption shortcode.

$id

( string ) required – ID of the image and caption container element, i.e. <figure> or `<div>`.

$caption_id

( string ) required – ID of the caption element, i.e. <figcaption> or `<p>`.

$align

( string ) required – Class name that aligns the caption. Default 'alignnone'. Accepts 'alignleft', 'aligncenter', alignright', 'alignnone'.

$width

( int ) required – The width of the caption, in pixels.

$caption

( string ) required – The caption text.

$class

( string ) required – Additional class name(s) added to the caption container. }

$content

( string ) optional – Optional. Shortcode content. Default empty string.

Returns

string HTML content to display the caption.

Source

File name: wordpress/wp-includes/media.php
Lines:

function img_caption_shortcode( $attr, $content = '' ) {
  // New-style shortcode with the caption inside the shortcode with the link and image tags.
  if ( ! isset( $attr['caption'] ) ) {
    if ( preg_match( '#((?:<a [^>]+>\s*)?<img [^>]+>(?:\s*</a>)?)(.*)#is', $content, $matches ) ) {
      $content         = $matches[1];
      $attr['caption'] = trim( $matches[2] );
    }
  } elseif ( str_contains( $attr['caption'], '<' ) ) {
    $attr['caption'] = wp_kses( $attr['caption'], 'post' );
  }

  
/**
 * Filters the default caption shortcode output.
 *
 * If the filtered output isn't empty, it will be used instead of generating
 * the default caption template.
 *
 * @since 2.6.0
 *
 * @see img_caption_shortcode()
 *
 * @param string $output  The caption output. Default empty.
 * @param array  $attr    Attributes of the caption shortcode.
 * @param string $content The image element, possibly wrapped in a hyperlink.
 */
  $output = apply_filters( 'img_caption_shortcode', '', $attr, $content );

  if ( ! empty( $output ) ) {
    return $output;
  }

  $atts = shortcode_atts(
    array(
      'id'         => '',
      'caption_id' => '',
      'align'      => 'alignnone',
      'width'      => '',
      'caption'    => '',
      'class'      => '',
    ),
    $attr,
    'caption'
  );

  $atts['width'] = (int) $atts['width'];

  if ( $atts['width'] < 1 || empty( $atts['caption'] ) ) {
    return $content;
  }

  $id          = '';
  $caption_id  = '';
  $describedby = '';

  if ( $atts['id'] ) {
    $atts['id'] = sanitize_html_class( $atts['id'] );
    $id         = 'id="' . esc_attr( $atts['id'] ) . '" ';
  }

  if ( $atts['caption_id'] ) {
    $atts['caption_id'] = sanitize_html_class( $atts['caption_id'] );
  } elseif ( $atts['id'] ) {
    $atts['caption_id'] = 'caption-' . str_replace( '_', '-', $atts['id'] );
  }

  if ( $atts['caption_id'] ) {
    $caption_id  = 'id="' . esc_attr( $atts['caption_id'] ) . '" ';
    $describedby = 'aria-describedby="' . esc_attr( $atts['caption_id'] ) . '" ';
  }

  $class = trim( 'wp-caption ' . $atts['align'] . ' ' . $atts['class'] );

  $html5 = current_theme_supports( 'html5', 'caption' );
  // HTML5 captions never added the extra 10px to the image width.
  $width = $html5 ? $atts['width'] : ( 10 + $atts['width'] );

  
/**
 * Filters the width of an image's caption.
 *
 * By default, the caption is 10 pixels greater than the width of the image,
 * to prevent post content from running up against a floated image.
 *
 * @since 3.7.0
 *
 * @see img_caption_shortcode()
 *
 * @param int    $width    Width of the caption in pixels. To remove this inline style,
 *                         return zero.
 * @param array  $atts     Attributes of the caption shortcode.
 * @param string $content  The image element, possibly wrapped in a hyperlink.
 */
  $caption_width = apply_filters( 'img_caption_shortcode_width', $width, $atts, $content );

  $style = '';

  if ( $caption_width ) {
    $style = 'style="width: ' . (int) $caption_width . 'px" ';
  }

  if ( $html5 ) {
 

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