block_core_image_render_lightbox

函数


      block_core_image_render_lightbox ( $block_content, $block )

参数

(string) $block_content Rendered block content.

Required: 是
(array) $block Block object.

Required: 是

返回值

(string) Filtered block content.

定义位置

wp-includes/blocks/image.php , line 129

相关方法: block_core_image_get_lightbox_settings block_core_gallery_render block_core_heading_render block_core_page_list_render_nested_page_list block_core_navigation_render_submenu_icon

引入: -

弃用: -

添加灯箱行为所需的指令和布局。

function block_core_image_render_lightbox( $block_content, $block ) {

* If it's not possible that an IMG element exists then return the given

* block content as-is. It may be that there's no actual image in the block

* or it could be that another plugin already modified this HTML.

if ( false === stripos( $block_content, '<img' ) ) {

return $block_content;

}

$processor = new WP_HTML_Tag_Processor( $block_content );

$aria_label = __( 'Enlarge image' );

* If there's definitely no IMG element in the block then return the given

* block content as-is. There's nothing that this code can knowingly modify

* to add the lightbox behavior.

if ( ! $processor->next_tag( 'img' ) ) {

return $block_content;

}

$alt_attribute = $processor->get_attribute( 'alt' );

// An empty alt attribute `alt=""` is valid for decorative images.

if ( is_string( $alt_attribute ) ) {

$alt_attribute = trim( $alt_attribute );

}

// It only makes sense to append the alt text to the button aria-label when the alt text is non-empty.

if ( $alt_attribute ) {

/* translators: %s: Image alt text. */

$aria_label = sprintf( __( 'Enlarge image: %s' ), $alt_attribute );

}

// Currently, we are only enabling the zoom animation.

$lightbox_animation = 'zoom';

// Note: We want to store the `src` in the context so we

// can set it dynamically when the lightbox is opened.

if ( isset( $block['attrs']['id'] ) ) {

$img_uploaded_src = wp_get_attachment_url( $block['attrs']['id'] );

$img_metadata = wp_get_attachment_metadata( $block['attrs']['id'] );

$img_width = $img_metadata['width'] ?? 'none';

$img_height = $img_metadata['height'] ?? 'none';

} else {

$img_uploaded_src = $processor->get_attribute( 'src' );

$img_width = 'none';

$img_height = 'none';

}

if ( isset( $block['attrs']['scale'] ) ) {

$scale_attr = $block['attrs']['scale'];

} else {

$scale_attr = false;

}

$w = new WP_HTML_Tag_Processor( $block_content );

$w->next_tag( 'figure' );

$w->add_class( 'wp-lightbox-container' );

$w->set_attribute( 'data-wp-interactive', true );

$w->set_attribute(

'data-wp-context',

sprintf(

'{ "core":

{ "image":

{ "imageLoaded": false,

"initialized": false,

"lightboxEnabled": false,

"hideAnimationEnabled": false,

"preloadInitialized": false,

"lightboxAnimation": "%s",

"imageUploadedSrc": "%s",

"imageCurrentSrc": "",

"targetWidth": "%s",

"targetHeight": "%s",

"scaleAttr": "%s",

"dialogLabel": "%s"

}

}',

$lightbox_animation,

$img_uploaded_src,

$img_width,

$img_height,

$scale_attr,

__( 'Enlarged image' )

)

);

$w->next_tag( 'img' );

$w->set_attribute( 'data-wp-init', 'effects.core.image.initOriginImage' );

$w->set_attribute( 'data-wp-on--load', 'actions.core.image.handleLoad' );

$w->set_attribute( 'data-wp-effect', 'effects.core.image.setButtonStyles' );

// We need to set an event callback on the `img` specifically

// because the `figure` element can also contain a caption, and

// we don't want to trigger the lightbox when the caption is clicked.

$w->set_attribute( 'data-wp-on--click', 'actions.core.image.showLightbox' );

$w->set_attribute( 'data-wp-effect--setStylesOnResize', 'effects.core.image.setStylesOnResize' );

$body_content = $w->get_updated_html();

// Add a button alongside image in the body content.

$img = null;

preg_match( '/<img[^>]+>/', $body_content, $img );

$button =

$img[0]

. '<button

class="lightbox-trigger"

type="button"

aria-haspopup="dialog"

aria-label="' . esc_attr( $aria_label ) . '"

data-wp-on--click="actions.core.image.showLightbox"

data-wp-style--right="context.core.image.imageButtonRight"

data-wp-style--top="context.core.image.imageButtonTop"

style="background: #000"

</svg>

</button>';

$body_content = preg_replace( '/<img[^>]+>/', $button, $body_content );

// We need both a responsive image and an enlarged image to animate

// the zoom seamlessly on slow internet connections; the responsive

// image is a copy of the one in the body, which animates immediately

// as the lightbox is opened, while the enlarged one is a full-sized

// version that will likely still be loading as the animation begins.

$m = new WP_HTML_Tag_Processor( $block_content );

$m->next_tag( 'figure' );

$m->add_class( 'responsive-image' );

$m->next_tag( 'img' );

// We want to set the 'src' attribute to an empty string in the responsive image

// because otherwise, as of this writing, the wp_filter_content_tags() function in

// WordPress will automatically add a 'srcset' attribute to the image, which will at

// times cause the incorrectly sized image to be loaded in the lightbox on Firefox.

// Because of this, we bind the 'src' attribute explicitly the current src to reliably

// use the exact same image as in the content when the lightbox is first opened while

// we wait for the larger image to load.

$m->set_attribute( 'src', '' );

$m->set_attribute( 'data-wp-bind--src', 'context.core.image.imageCurrentSrc' );

$m->set_attribute( 'data-wp-style--object-fit', 'selectors.core.image.lightboxObjectFit' );

$initial_image_content = $m->get_updated_html();

$q = new WP_HTML_Tag_Processor( $block_content );

$q->next_tag( 'figure' );

$q->add_class( 'enlarged-image' );

$q->next_tag( 'img' );

// We set the 'src' attribute to an empty string to prevent the browser from loading the image

// on initial page load, then bind the attribute to a selector that returns the full-sized image src when

// the lightbox is opened. We could use 'loading=lazy' in combination with the 'hidden' attribute to

// accomplish the same behavior, but that approach breaks progressive loading of the image in Safari

// and Chrome (see https://github.com/WordPress/gutenberg/pull/52765#issuecomment-1674008151). Until that

// is resolved, manually setting the 'src' seems to be the best solution to load the large image on demand.

$q->set_attribute( 'src', '' );

$q->set_attribute( 'data-wp-bind--src', 'selectors.core.image.enlargedImgSrc' );

$q->set_attribute( 'data-wp-style--object-fit', 'selectors.core.image.lightboxObjectFit' );

$enlarged_image_content = $q->get_updated_html();

// If the current theme does NOT have a `theme.json`, or the colors are not defined,

// we need to set the background color & close button color to some default values

// because we can't get them from the Global Styles.

$background_color = '#fff';

$close_button_color = '#000';

if ( wp_theme_has_theme_json() ) {

$global_styles_color = wp_get_global_styles( array( 'color' ) );

if ( ! empty( $global_styles_color['background'] ) ) {

$background_color = esc_attr( $global_styles_color['background'] );

}

if ( ! empty( $global_styles_color['text'] ) ) {

$close_button_color = esc_attr( $global_styles_color['text'] );

}

$close_button_icon = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="15" height="15" aria-hidden="true" focusable="false"><path d="M13 11.8l6.1-6.3-1-1-6.1 6.2-6.1-6.2-1 1 6.1 6.3-6.5 6.7 1 1 6.5-6.6 6.5 6.6 1-1z"></path></svg>';

$close_button_label = esc_attr__( 'Close' );

$lightbox_html = <<<HTML

<div data-wp-body="" class="wp-lightbox-overlay $lightbox_animation"

data-wp-bind--role="selectors.core.image.roleAttribute"

data-wp-bind--aria-label="selectors.core.image.dialogLabel"

data-wp-class--initialized="context.core.image.initialized"

data-wp-class--active="context.core.image.lightboxEnabled"

data-wp-class--hideAnimationEnabled="context.core.image.hideAnimationEnabled"

data-wp-bind--aria-modal="selectors.core.image.ariaModal"

data-wp-effect="effects.core.image.initLightbox"

data-wp-on--keydown="actions.core.image.handleKeydown"

data-wp-on--touchstart="actions.core.image.handleTouchStart"

data-wp-on--touchmove="actions.core.image.handleTouchMove"

data-wp-on--touchend="actions.core.image.handleTouchEnd"

data-wp-on--click="actions.core.image.hideLightbox"

tabindex="-1"

$close_button_icon

</button>

<div class="lightbox-image-container">$initial_image_content</div>

<div class="lightbox-image-container">$enlarged_image_content</div>

</div>

HTML;

return str_replace( '</figure>', $lightbox_html . '</figure>', $body_content );

}

function block_core_image_render_lightbox( $block_content, $block ) {
	/*
	 * If it's not possible that an IMG element exists then return the given
	 * block content as-is. It may be that there's no actual image in the block
	 * or it could be that another plugin already modified this HTML.
	 */
	if ( false === stripos( $block_content, '<img' ) ) {
		return $block_content;
	}

	$processor = new WP_HTML_Tag_Processor( $block_content );

	$aria_label = __( 'Enlarge image' );

	/*
	 * If there's definitely no IMG element in the block then return the given
	 * block content as-is. There's nothing that this code can knowingly modify
	 * to add the lightbox behavior.
	 */
	if ( ! $processor->next_tag( 'img' ) ) {
		return $block_content;
	}

	$alt_attribute = $processor->get_attribute( 'alt' );

	// An empty alt attribute `alt=""` is valid for decorative images.
	if ( is_string( $alt_attribute ) ) {
		$alt_attribute = trim( $alt_attribute );
	}

	// It only makes sense to append the alt text to the button aria-label when the alt text is non-empty.
	if ( $alt_attribute ) {
		/* translators: %s: Image alt text. */
		$aria_label = sprintf( __( 'Enlarge image: %s' ), $alt_attribute );
	}

	// Currently, we are only enabling the zoom animation.
	$lightbox_animation = 'zoom';

	// Note: We want to store the `src` in the context so we
	// can set it dynamically when the lightbox is opened.
	if ( isset( $block['attrs']['id'] ) ) {
		$img_uploaded_src = wp_get_attachment_url( $block['attrs']['id'] );
		$img_metadata     = wp_get_attachment_metadata( $block['attrs']['id'] );
		$img_width        = $img_metadata['width'] ?? 'none';
		$img_height       = $img_metadata['height'] ?? 'none';
	} else {
		$img_uploaded_src = $processor->get_attribute( 'src' );
		$img_width        = 'none';
		$img_height       = 'none';
	}

	if ( isset( $block['attrs']['scale'] ) ) {
		$scale_attr = $block['attrs']['scale'];
	} else {
		$scale_attr = false;
	}

	$w = new WP_HTML_Tag_Processor( $block_content );
	$w->next_tag( 'figure' );
	$w->add_class( 'wp-lightbox-container' );
	$w->set_attribute( 'data-wp-interactive', true );

	$w->set_attribute(
		'data-wp-context',
		sprintf(
			'{ "core":
				{ "image":
					{   "imageLoaded": false,
						"initialized": false,
						"lightboxEnabled": false,
						"hideAnimationEnabled": false,
						"preloadInitialized": false,
						"lightboxAnimation": "%s",
						"imageUploadedSrc": "%s",
						"imageCurrentSrc": "",
						"targetWidth": "%s",
						"targetHeight": "%s",
						"scaleAttr": "%s",
						"dialogLabel": "%s"
					}
				}
			}',
			$lightbox_animation,
			$img_uploaded_src,
			$img_width,
			$img_height,
			$scale_attr,
			__( 'Enlarged image' )
		)
	);
	$w->next_tag( 'img' );
	$w->set_attribute( 'data-wp-init', 'effects.core.image.initOriginImage' );
	$w->set_attribute( 'data-wp-on--load', 'actions.core.image.handleLoad' );
	$w->set_attribute( 'data-wp-effect', 'effects.core.image.setButtonStyles' );
	// We need to set an event callback on the `img` specifically
	// because the `figure` element can also contain a caption, and
	// we don't want to trigger the lightbox when the caption is clicked.
	$w->set_attribute( 'data-wp-on--click', 'actions.core.image.showLightbox' );
	$w->set_attribute( 'data-wp-effect--setStylesOnResize', 'effects.core.image.setStylesOnResize' );
	$body_content = $w->get_updated_html();

	// Add a button alongside image in the body content.
	$img = null;
	preg_match( '/<img[^>]+>/', $body_content, $img );

	$button =
		$img[0]
		. '<button
			class="lightbox-trigger"
			type="button"
			aria-haspopup="dialog"
			aria-label="' . esc_attr( $aria_label ) . '"
			data-wp-on--click="actions.core.image.showLightbox"
			data-wp-style--right="context.core.image.imageButtonRight"
			data-wp-style--top="context.core.image.imageButtonTop"
			style="background: #000"
		>
			<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" aria-hidden="true" focusable="false">
				<Path stroke="#FFFFFF" d="M6 4a2 2 0 0 0-2 2v3h1.5V6a.5.5 0 0 1 .5-.5h3V4H6Zm3 14.5H6a.5.5 0 0 1-.5-.5v-3H4v3a2 2 0 0 0 2 2h3v-1.5Zm6 1.5v-1.5h3a.5.5 0 0 0 .5-.5v-3H20v3a2 2 0 0 1-2 2h-3Zm3-16a2 2 0 0 1 2 2v3h-1.5V6a.5.5 0 0 0-.5-.5h-3V4h3Z" />
			</svg>
		</button>';

	$body_content = preg_replace( '/<img[^>]+>/', $button, $body_content );

	// We need both a responsive image and an enlarged image to animate
	// the zoom seamlessly on slow internet connections; the responsive
	// image is a copy of the one in the body, which animates immediately
	// as the lightbox is opened, while the enlarged one is a full-sized
	// version that will likely still be loading as the animation begins.
	$m = new WP_HTML_Tag_Processor( $block_content );
	$m->next_tag( 'figure' );
	$m->add_class( 'responsive-image' );
	$m->next_tag( 'img' );
	// We want to set the 'src' attribute to an empty string in the responsive image
	// because otherwise, as of this writing, the wp_filter_content_tags() function in
	// WordPress will automatically add a 'srcset' attribute to the image, which will at
	// times cause the incorrectly sized image to be loaded in the lightbox on Firefox.
	// Because of this, we bind the 'src' attribute explicitly the current src to reliably
	// use the exact same image as in the content when the lightbox is first opened while
	// we wait for the larger image to load.
	$m->set_attribute( 'src', '' );
	$m->set_attribute( 'data-wp-bind--src', 'context.core.image.imageCurrentSrc' );
	$m->set_attribute( 'data-wp-style--object-fit', 'selectors.core.image.lightboxObjectFit' );
	$initial_image_content = $m->get_updated_html();

	$q = new WP_HTML_Tag_Processor( $block_content );
	$q->next_tag( 'figure' );
	$q->add_class( 'enlarged-image' );
	$q->next_tag( 'img' );

	// We set the 'src' attribute to an empty string to prevent the browser from loading the image
	// on initial page load, then bind the attribute to a selector that returns the full-sized image src when
	// the lightbox is opened. We could use 'loading=lazy' in combination with the 'hidden' attribute to
	// accomplish the same behavior, but that approach breaks progressive loading of the image in Safari
	// and Chrome (see https://github.com/WordPress/gutenberg/pull/52765#issuecomment-1674008151). Until that
	// is resolved, manually setting the 'src' seems to be the best solution to load the large image on demand.
	$q->set_attribute( 'src', '' );
	$q->set_attribute( 'data-wp-bind--src', 'selectors.core.image.enlargedImgSrc' );
	$q->set_attribute( 'data-wp-style--object-fit', 'selectors.core.image.lightboxObjectFit' );
	$enlarged_image_content = $q->get_updated_html();

	// If the current theme does NOT have a `theme.json`, or the colors are not defined,
	// we need to set the background color & close button color to some default values
	// because we can't get them from the Global Styles.
	$background_color   = '#fff';
	$close_button_color = '#000';
	if ( wp_theme_has_theme_json() ) {
		$global_styles_color = wp_get_global_styles( array( 'color' ) );
		if ( ! empty( $global_styles_color['background'] ) ) {
			$background_color = esc_attr( $global_styles_color['background'] );
		}
		if ( ! empty( $global_styles_color['text'] ) ) {
			$close_button_color = esc_attr( $global_styles_color['text'] );
		}
	}

	$close_button_icon  = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="15" height="15" aria-hidden="true" focusable="false"><path d="M13 11.8l6.1-6.3-1-1-6.1 6.2-6.1-6.2-1 1 6.1 6.3-6.5 6.7 1 1 6.5-6.6 6.5 6.6 1-1z"></path></svg>';
	$close_button_label = esc_attr__( 'Close' );

	$lightbox_html = <<<HTML
        <div data-wp-body="" class="wp-lightbox-overlay $lightbox_animation"
            data-wp-bind--role="selectors.core.image.roleAttribute"
            data-wp-bind--aria-label="selectors.core.image.dialogLabel"
            data-wp-class--initialized="context.core.image.initialized"
            data-wp-class--active="context.core.image.lightboxEnabled"
            data-wp-class--hideAnimationEnabled="context.core.image.hideAnimationEnabled"
            data-wp-bind--aria-modal="selectors.core.image.ariaModal"
            data-wp-effect="effects.core.image.initLightbox"
            data-wp-on--keydown="actions.core.image.handleKeydown"
            data-wp-on--touchstart="actions.core.image.handleTouchStart"
            data-wp-on--touchmove="actions.core.image.handleTouchMove"
            data-wp-on--touchend="actions.core.image.handleTouchEnd"
            data-wp-on--click="actions.core.image.hideLightbox"
            tabindex="-1"
            >
                <button type="button" aria-label="$close_button_label" style="fill: $close_button_color" class="close-button" data-wp-on--click="actions.core.image.hideLightbox">
                    $close_button_icon
                </button>
                <div class="lightbox-image-container">$initial_image_content</div>
                <div class="lightbox-image-container">$enlarged_image_content</div>
                <div class="scrim" style="background-color: $background_color" aria-hidden="true"></div>
        </div>
HTML;

	return str_replace( '</figure>', $lightbox_html . '</figure>', $body_content );
}

常见问题

FAQs

如何使用get_users获取所有用户列表？
要使用` get_users `函数获取所有用户列表，可以按照以下步骤进行：

1. 使用` get_users `函数调用获取用户列表：

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EnlighterJS 3 Syntax Highlighter
$users = get_users();
$users = get_users();
```
$users = get_users();
```
2. 您可以按需使用参数来过滤结果。例如，您可以通过角色、用户ID、用户登录名等过滤用户列表。以下是一个根据用户角色为过滤条件的示例：

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$users = get_users( array(
'role' => 'subscriber' // 将角色名称替换为您要过滤的角色
) );
$users = get_users( array( 'role' => 'subscriber' // 将角色名称替换为您要过滤的角色 ) );
```
$users = get_users( array(
    'role' => 'subscriber' // 将角色名称替换为您要过滤的角色
) );
```
在上述示例中，将` role `参数设置为所需的角色名称来过滤用户列表。

3. 您可以使用循环遍历获取的用户列表，并访问每个用户的属性。例如，以下示例将显示每个用户的用户名和电子邮件地址：

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foreach( $users as $user ) {
echo '用户名：' . $user->user_login . ', 电子邮件：' . $user->user_email . ;
}
foreach( $users as $user ) { echo '用户名：' . $user->user_login . ', 电子邮件：' . $user->user_email . ; }
```
foreach( $users as $user ) {
    echo '用户名：' . $user->user_login . ', 电子邮件：' . $user->user_email . ;
}
```
在上述示例中，通过` $user->user_login `和` $user->user_email `访问每个用户的用户名和电子邮件地址。

请注意，` get_users `函数默认返回所有用户，并可以根据需要使用更多参数进行过滤。您可以参阅WordPress官方文档中的` get_users `函数文档，了解更多可用参数和用法示例。

总结起来，使用` get_users `函数获取所有用户列表的步骤是：
1. 调用` get_users `函数获取用户列表。
2. 使用可选的过滤参数，根据需要过滤用户列表。
3. 使用循环遍历用户列表，并访问每个用户的属性。
如何使用WP_PLUGIN_DIR和WP_PLUGIN_URL定义插件的目录和URL？
在WordPress中，可以使用WP_PLUGIN_DIR和WP_PLUGIN_URL常量来定义插件的目录路径和URL。

1. `WP_PLUGIN_DIR`：这是一个常量，用于定义插件的目录路径（文件系统路径）。您可以使用以下代码在插件文件中访问该常量：

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$plugin_dir = WP_PLUGIN_DIR . '/your-plugin-folder/';
$plugin_dir = WP_PLUGIN_DIR . '/your-plugin-folder/';
```
$plugin_dir = WP_PLUGIN_DIR . '/your-plugin-folder/';
```
在上述代码中，将"your-plugin-folder"替换为您插件的实际文件夹名称。使用该常量，您可以获取插件文件的完整路径。

2. `WP_PLUGIN_URL`：这是一个常量，用于定义插件的URL（用于在网页上访问插件文件）。以下是一个使用该常量的示例：

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$plugin_url = WP_PLUGIN_URL . '/your-plugin-folder/';
$plugin_url = WP_PLUGIN_URL . '/your-plugin-folder/';
```
$plugin_url = WP_PLUGIN_URL . '/your-plugin-folder/';
```
同样，请将"your-plugin-folder"替换为您插件的实际文件夹名称。使用该常量，您可以获取插件在网页上的完整URL。

请注意，`WP_PLUGIN_DIR`和`WP_PLUGIN_URL`常量在WordPress版本2.6之后引入。从WordPress 5.5版本开始，这两个常量被标记为过时（deprecated），因为WordPress更倾向于使用新的插件文件结构。如果您正在开发新插件，建议使用新的插件文件结构和相关函数。

在新的插件文件结构中，可以使用以下函数来获取插件的目录路径和URL：

- `plugin_dir_path()`：获取插件目录路径。
- `plugin_dir_url()`：获取插件URL。

这些函数会自动将插件的版本、多站点和SSL等考虑因素纳入计算。

总结起来，使用`WP_PLUGIN_DIR`和`WP_PLUGIN_URL`常量定义插件的目录和URL的方法是：

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$plugin_dir = WP_PLUGIN_DIR . '/your-plugin-folder/';
$plugin_url = WP_PLUGIN_URL . '/your-plugin-folder/';
$plugin_dir = WP_PLUGIN_DIR . '/your-plugin-folder/'; $plugin_url = WP_PLUGIN_URL . '/your-plugin-folder/';
```
$plugin_dir = WP_PLUGIN_DIR . '/your-plugin-folder/';
$plugin_url = WP_PLUGIN_URL . '/your-plugin-folder/';
```
但请注意，这两个常量已被标记为过时，建议使用新的插件文件结构和相关函数来获取插件的路径和URL。
如何使用PHP在WordPress中添加自定义功能？
使用PHP在WordPress中添加自定义功能可以通过以下方式实现：
- 创建一个自定义插件，将功能代码添加到插件中。
- 使用WordPress的钩子系统，将自定义功能绑定到适当的钩子上。
- 在主题文件中添加自定义功能代码，例如functions.php文件。
- 使用WordPress的短代码功能，将自定义功能封装为短代码。
- 使用WordPress的插件或主题编辑器，将自定义功能代码添加到适当的位置。
下面是一个实操示例。

要在WordPress中添加自定义功能，可以按照以下步骤使用PHP编写并添加自定义功能：
1. 打开WordPress安装目录中的主题文件夹，通常位于wp-content/themes/下，找到正在使用的主题文件夹。
2. 在主题文件夹中，可以创建一个名为functions.php的文件。如果该文件已经存在，可以直接编辑它。
3. 在functions.php文件中，可以使用PHP代码添加自定义功能。以下是一些常见的示例：
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  // 添加自定义功能示例
  // 1. 创建自定义短代码
  function custom_shortcode() {
  return '这是我的自定义短代码内容';
  }
  add_shortcode('custom', 'custom_shortcode');
  // 2. 自定义小工具
  function custom_widget() {
  echo '这是我的自定义小工具内容';
  }
  register_widget('custom_widget');
  // 3. 自定义菜单
  function custom_menu() {
  register_nav_menu('custom-menu', '自定义菜单');
  }
  add_action('after_setup_theme', 'custom_menu');
  // 4. 自定义页面模板
  function custom_page_template() {
  /* Template Name: 自定义模板 */
  // 自定义模板的内容和样式
  }
  // 添加自定义功能示例 // 1. 创建自定义短代码 function custom_shortcode() { return '这是我的自定义短代码内容'; } add_shortcode('custom', 'custom_shortcode'); // 2. 自定义小工具 function custom_widget() { echo '这是我的自定义小工具内容'; } register_widget('custom_widget'); // 3. 自定义菜单 function custom_menu() { register_nav_menu('custom-menu', '自定义菜单'); } add_action('after_setup_theme', 'custom_menu'); // 4. 自定义页面模板 function custom_page_template() { /* Template Name: 自定义模板 */ // 自定义模板的内容和样式 }
```
// 添加自定义功能示例

// 1. 创建自定义短代码
function custom_shortcode() {
    return '这是我的自定义短代码内容';
}
add_shortcode('custom', 'custom_shortcode');

// 2. 自定义小工具
function custom_widget() {
    echo '这是我的自定义小工具内容';
}
register_widget('custom_widget');

// 3. 自定义菜单
function custom_menu() {
    register_nav_menu('custom-menu', '自定义菜单');
}
add_action('after_setup_theme', 'custom_menu');

// 4. 自定义页面模板
function custom_page_template() {
    /* Template Name: 自定义模板 */
    // 自定义模板的内容和样式
}
```
4. 编辑完functions.php文件后，保存并上传到WordPress主题文件夹中。
请注意，修改主题文件可以在主题更新时丢失，因此建议在进行任何更改之前备份functions.php文件。此外，为避免不必要的错误和冲突，建议在添加自定义功能前先了解WordPress开发文档和最佳实践，以确保正确、安全地实现所需的自定义功能。
如何进行WordPress数据库查询优化？
进行WordPress数据库查询优化可以通过以下方式实现：
- 使用WordPress提供的内置查询函数，例如 WP_Query 、 get_posts 等。
- 使用适当的查询参数和过滤器，减少查询次数和数据量。
- 编写自定义的数据库查询语句，使用适当的索引和缓存。
- 优化数据库服务器配置和性能。
- 定期清理和优化数据库表。
如何使用do_action来触发一个钩子函数？
使用 do_action 函数可以触发一个钩子函数。do_action 函数的参数与要触发的钩子函数的参数相同。

例如，触发save_post钩子函数的代码如下：

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do_action( 'save_post', $post_ID, $post );
do_action( 'save_post', $post_ID, $post );
```
do_action( 'save_post', $post_ID, $post );
```
这里，$post_ID 和 $post 是传递给钩子函数的参数。
如何使用wp_get_current_user获取当前登录用户的信息？
使用 wp_get_current_user 获取当前登录用户的信息：

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$current_user = wp_get_current_user();

// 获取当前用户的ID
$user_id = $current_user->ID;

// 获取当前用户的用户名
$user_login = $current_user->user_login;

// 获取当前用户的邮箱
$user_email = $current_user->user_email;

// 获取当前用户的显示名称
$display_name = $current_user->display_name;
$current_user = wp_get_current_user(); // 获取当前用户的ID $user_id = $current_user->ID; // 获取当前用户的用户名 $user_login = $current_user->user_login; // 获取当前用户的邮箱 $user_email = $current_user->user_email; // 获取当前用户的显示名称 $display_name = $current_user->display_name;
```
$current_user = wp_get_current_user();  
  
// 获取当前用户的ID  
$user_id = $current_user->ID;  
  
// 获取当前用户的用户名  
$user_login = $current_user->user_login;  
  
// 获取当前用户的邮箱  
$user_email = $current_user->user_email;  
  
// 获取当前用户的显示名称  
$display_name = $current_user->display_name;
```

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