Question

get_header_image_tag( array $attr = array() )

Create image tag markup for a custom header image.

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description

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参数

$attr

(array) (Optional) Additional attributes for the image tag. Can be used to override the default attributes.

Default value: array()

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返回值

(string) HTML image element markup or empty string on failure.

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源代码

File: wp-includes/theme.php

function get_header_image_tag( $attr = array() ) {
	$header = get_custom_header();
	$header->url = get_header_image();

	if ( ! $header->url ) {
		return '';
	}

	$width = absint( $header->width );
	$height = absint( $header->height );

	$attr = wp_parse_args(
		$attr,
		array(
			'src' => $header->url,
			'width' => $width,
			'height' => $height,
			'alt' => get_bloginfo( 'name' ),
		)
	);

	// Generate 'srcset' and 'sizes' if not already present.
	if ( empty( $attr['srcset'] ) && ! empty( $header->attachment_id ) ) {
		$image_meta = get_post_meta( $header->attachment_id, '_wp_attachment_metadata', true );
		$size_array = array( $width, $height );

		if ( is_array( $image_meta ) ) {
			$srcset = wp_calculate_image_srcset( $size_array, $header->url, $image_meta, $header->attachment_id );
			$sizes = ! empty( $attr['sizes'] ) ? $attr['sizes'] : wp_calculate_image_sizes( $size_array, $header->url, $image_meta, $header->attachment_id );

			if ( $srcset && $sizes ) {
				$attr['srcset'] = $srcset;
				$attr['sizes'] = $sizes;
			}
		}
	}

	$attr = array_map( 'esc_attr', $attr );
	$html = '<img';

	foreach ( $attr as $name => $value ) {
		$html .= ' ' . $name . '="' . $value . '"';
	}

	$html .= ' />';

	/**
	 * Filters the markup of header images.
	 *
	 * @since 4.4.0
	 *
	 * @param string $html   The HTML image tag markup being filtered.
	 * @param object $header The custom header object returned by 'get_custom_header()'.
	 * @param array  $attr   Array of the attributes for the image tag.
	 */
	return apply_filters( 'get_header_image_tag', $html, $header, $attr );
}

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更新日志

Version	description
4.4.0	Introduced.

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相关函数

Uses

• wp-includes/theme.php: get_header_image_tag
• wp-includes/media.php: wp_calculate_image_srcset()
• wp-includes/media.php: wp_calculate_image_sizes()
• wp-includes/theme.php: get_custom_header()
• wp-includes/theme.php: get_header_image()
• wp-includes/general-template.php: get_bloginfo()
• wp-includes/functions.php: absint()
• wp-includes/functions.php: wp_parse_args()
• wp-includes/plugin.php: apply_filters()
• wp-includes/post.php: get_post_meta()
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Used By

• wp-includes/theme.php: get_custom_header_markup()
• wp-includes/theme.php: the_header_image_tag()

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User Contributed Notes