Question

get_image_tag( int $id,  string $alt,  string $title,  string $align,  string|array $size = 'medium' )

Gets an img tag for an image attachment, scaling it down if requested.

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description

The ‘get_image_tag_class’ filter allows for changing the class name for the image without having to use regular expressions on the HTML content. The parameters are: what WordPress will use for the class, the Attachment ID, image align value, and the size the image should be.

The second filter, ‘get_image_tag’, has the HTML content, which can then be further manipulated by a plugin to change all attribute values and even HTML content.

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参数

$id

(int) (Required) Attachment ID.

$alt

(string) (Required) Image description for the alt attribute.

$title

(string) (Required) Image description for the title attribute.

$align

(string) (Required) Part of the class name for aligning the image.

$size

(string|array) (Optional) Registered image size to retrieve a tag for. Accepts any valid image size, or an array of width and height values in pixels (in that order).

Default value: 'medium'

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返回值

(string) HTML IMG element for given image attachment

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源代码

File: wp-includes/media.php

function get_image_tag( $id, $alt, $title, $align, $size = 'medium' ) {

	list( $img_src, $width, $height ) = image_downsize($id, $size);
	$hwstring = image_hwstring($width, $height);

	$title = $title ? 'title="' . esc_attr( $title ) . '" ' : '';

	$class = 'align' . esc_attr($align) .' size-' . esc_attr($size) . ' wp-image-' . $id;

	/**
	 * Filters the value of the attachment's image tag class attribute.
	 *
	 * @since 2.6.0
	 *
	 * @param string       $class CSS class name or space-separated list of classes.
	 * @param int          $id    Attachment ID.
	 * @param string       $align Part of the class name for aligning the image.
	 * @param string|array $size  Size of image. Image size or array of width and height values (in that order).
	 *                            Default 'medium'.
	 */
	$class = apply_filters( 'get_image_tag_class', $class, $id, $align, $size );

	$html = '<img src="' . esc_attr($img_src) . '" alt="' . esc_attr($alt) . '" ' . $title . $hwstring . 'class="' . $class . '" />';

	/**
	 * Filters the HTML content for the image tag.
	 *
	 * @since 2.6.0
	 *
	 * @param string       $html  HTML content for the image.
	 * @param int          $id    Attachment ID.
	 * @param string       $alt   Alternate text.
	 * @param string       $title Attachment title.
	 * @param string       $align Part of the class name for aligning the image.
	 * @param string|array $size  Size of image. Image size or array of width and height values (in that order).
	 *                            Default 'medium'.
	 */
	return apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size );
}

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更新日志

Version	description
2.5.0	Introduced.

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相关函数

Uses

• wp-includes/formatting.php: esc_attr()
• wp-includes/plugin.php: apply_filters()
• wp-includes/media.php: get_image_tag_class
• wp-includes/media.php: get_image_tag
• wp-includes/media.php: image_downsize()
• wp-includes/media.php: image_hwstring()
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Used By

• wp-admin/includes/media.php: get_image_send_to_editor()

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User Contributed Notes