W3cubDocs

/WordPress

image_add_caption( string $html, integer $id, string $caption, string $title, string $align, string $url, string $size, string $alt = '' )

Adds image shortcode with caption to editor.

Parameters

$html

(string) (Required) The image HTML markup to send.

$id

(integer) (Required) Image attachment ID.

$caption

(string) (Required) Image caption.

$title

(string) (Required) Image title attribute (not used).

$align

(string) (Required) Image CSS alignment property.

$url

(string) (Required) Image source URL (not used).

$size

(string) (Required) Image size (thumbnail, medium, large, full, or added with add_image_size()) (not used).

$alt

(string) (Optional) Image alt attribute (not used).

Default value: ''

Return

(string) The image HTML markup with caption shortcode.

Source

File: wp-admin/includes/media.php

function image_add_caption( $html, $id, $caption, $title, $align, $url, $size, $alt = '' ) {

	/**
	 * Filters the caption text.
	 *
	 * Note: If the caption text is empty, the caption shortcode will not be appended
	 * to the image HTML when inserted into the editor.
	 *
	 * Passing an empty value also prevents the {@see 'image_add_caption_shortcode'}
	 * Filters from being evaluated at the end of image_add_caption().
	 *
	 * @since 4.1.0
	 *
	 * @param string $caption The original caption text.
	 * @param int    $id      The attachment ID.
	 */
	$caption = apply_filters( 'image_add_caption_text', $caption, $id );

	/**
	 * Filters whether to disable captions.
	 *
	 * Prevents image captions from being appended to image HTML when inserted into the editor.
	 *
	 * @since 2.6.0
	 *
	 * @param bool $bool Whether to disable appending captions. Returning true from the filter
	 *                   will disable captions. Default empty string.
	 */
	if ( empty( $caption ) || apply_filters( 'disable_captions', '' ) ) {
		return $html;
	}

	$id = ( 0 < (int) $id ) ? 'attachment_' . $id : '';

	if ( ! preg_match( '/width=["\']([0-9]+)/', $html, $matches ) ) {
		return $html;
	}

	$width = $matches[1];

	$caption = str_replace( array( "\r\n", "\r" ), "\n", $caption );
	$caption = preg_replace_callback( '/<[a-zA-Z0-9]+(?: [^<>]+>)*/', '_cleanup_image_add_caption', $caption );

	// Convert any remaining line breaks to <br />.
	$caption = preg_replace( '/[ \n\t]*\n[ \t]*/', '<br />', $caption );

	$html = preg_replace( '/(class=["\'][^\'"]*)align(none|left|right|center)\s?/', '$1', $html );
	if ( empty( $align ) ) {
		$align = 'none';
	}

	$shcode = '[caption id="' . $id . '" align="align' . $align . '" width="' . $width . '"]' . $html . ' ' . $caption . '[/caption]';

	/**
	 * Filters the image HTML markup including the caption shortcode.
	 *
	 * @since 2.6.0
	 *
	 * @param string $shcode The image HTML markup with caption shortcode.
	 * @param string $html   The image HTML markup.
	 */
	return apply_filters( 'image_add_caption_shortcode', $shcode, $html );
}

Uses

Uses	Description
wp-admin/includes/media.php: image_add_caption_text	Filters the caption text.
wp-admin/includes/media.php: disable_captions	Filters whether to disable captions.
wp-admin/includes/media.php: image_add_caption_shortcode	Filters the image HTML markup including the caption shortcode.
wp-includes/plugin.php: apply_filters()	Calls the callback functions that have been added to a filter hook.

Changelog

Version	Description
2.6.0	Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/image_add_caption