使用WordPress和Astro创建静态网站
wp_image_editor ( $post_id, $msg = false )
wp_image_editor: 这个函数用来为一个给定的图像文件创建一个图像编辑器对象。它接受一个参数，即图像文件的路径，并返回一个可用于操作图像的对象。
加载WP图像编辑界面。
function wp_image_editor( $post_id, $msg = false ) {
$nonce = wp_create_nonce( "image_editor-$post_id" );
$meta = wp_get_attachment_metadata( $post_id );
$thumb = image_get_intermediate_size( $post_id, 'thumbnail' );
$sub_sizes = isset( $meta['sizes'] ) && is_array( $meta['sizes'] );
$note = '';
if ( isset( $meta['width'], $meta['height'] ) ) {
$big = max( $meta['width'], $meta['height'] );
} else {
die( __( 'Image data does not exist. Please re-upload the image.' ) );
}
$sizer = $big > 400 ? 400 / $big : 1;
$backup_sizes = get_post_meta( $post_id, '_wp_attachment_backup_sizes', true );
$can_restore = false;
if ( ! empty( $backup_sizes ) && isset( $backup_sizes['full-orig'], $meta['file'] ) ) {
$can_restore = wp_basename( $meta['file'] ) !== $backup_sizes['full-orig']['file'];
}
if ( $msg ) {
if ( isset( $msg->error ) ) {
$note = "<div class='notice notice-error' tabindex='-1' role='alert'><p>$msg->error</p></div>";
} elseif ( isset( $msg->msg ) ) {
$note = "<div class='notice notice-success' tabindex='-1' role='alert'><p>$msg->msg</p></div>";
}
}
$edit_custom_sizes = false;
/**
* Filters whether custom sizes are available options for image editing.
*
* @since 6.0.0
*
* @param bool|string[] $edit_custom_sizes True if custom sizes can be edited or array of custom size names.
*/
$edit_custom_sizes = apply_filters( 'edit_custom_thumbnail_sizes', $edit_custom_sizes );
?>
<div class="imgedit-wrap wp-clearfix">
<div id="imgedit-panel-<?php echo $post_id; ?>">
<div class="imgedit-panel-content wp-clearfix">
<?php echo $note; ?>
<div class="imgedit-menu wp-clearfix">
<button type="button" onclick="imageEdit.handleCropToolClick( <?php echo "$post_id, '$nonce'"; ?>, this )" class="imgedit-crop button disabled" disabled><?php esc_html_e( 'Crop' ); ?></button>
<?php
// On some setups GD library does not provide imagerotate() - Ticket #11536.
if ( wp_image_editor_supports(
array(
'mime_type' => get_post_mime_type( $post_id ),
'methods' => array( 'rotate' ),
)
) ) {
$note_no_rotate = '';
?>
<button type="button" class="imgedit-rleft button" onclick="imageEdit.rotate( 90, <?php echo "$post_id, '$nonce'"; ?>, this)"><?php esc_html_e( 'Rotate left' ); ?></button>
<button type="button" class="imgedit-rright button" onclick="imageEdit.rotate(-90, <?php echo "$post_id, '$nonce'"; ?>, this)"><?php esc_html_e( 'Rotate right' ); ?></button>
<?php
} else {
$note_no_rotate = '<p class="note-no-rotate"><em>' . __( 'Image rotation is not supported by your web host.' ) . '</em></p>';
?>
<button type="button" class="imgedit-rleft button disabled" disabled></button>
<button type="button" class="imgedit-rright button disabled" disabled></button>
<?php } ?>
<button type="button" onclick="imageEdit.flip(1, <?php echo "$post_id, '$nonce'"; ?>, this)" class="imgedit-flipv button"><?php esc_html_e( 'Flip vertical' ); ?></button>
<button type="button" onclick="imageEdit.flip(2, <?php echo "$post_id, '$nonce'"; ?>, this)" class="imgedit-fliph button"><?php esc_html_e( 'Flip horizontal' ); ?></button>
<br class="imgedit-undo-redo-separator" />
<button type="button" id="image-undo-<?php echo $post_id; ?>" onclick="imageEdit.undo(<?php echo "$post_id, '$nonce'"; ?>, this)" class="imgedit-undo button disabled" disabled><?php esc_html_e( 'Undo' ); ?></button>
<button type="button" id="image-redo-<?php echo $post_id; ?>" onclick="imageEdit.redo(<?php echo "$post_id, '$nonce'"; ?>, this)" class="imgedit-redo button disabled" disabled><?php esc_html_e( 'Redo' ); ?></button>
<?php echo $note_no_rotate; ?>
</div>
<input type="hidden" id="imgedit-sizer-<?php echo $post_id; ?>" value="<?php echo $sizer; ?>" />
<input type="hidden" id="imgedit-history-<?php echo $post_id; ?>" value="" />
<input type="hidden" id="imgedit-undone-<?php echo $post_id; ?>" value="0" />
<input type="hidden" id="imgedit-selection-<?php echo $post_id; ?>" value="" />
<input type="hidden" id="imgedit-x-<?php echo $post_id; ?>" value="<?php echo isset( $meta['width'] ) ? $meta['width'] : 0; ?>" />
<input type="hidden" id="imgedit-y-<?php echo $post_id; ?>" value="<?php echo isset( $meta['height'] ) ? $meta['height'] : 0; ?>" />
<div id="imgedit-crop-<?php echo $post_id; ?>" class="imgedit-crop-wrap">
<img id="image-preview-<?php echo $post_id; ?>" onload="imageEdit.imgLoaded('<?php echo $post_id; ?>')"
src="<?php echo esc_url( admin_url( 'admin-ajax.php', 'relative' ) ) . '?action=imgedit-preview&_ajax_nonce=' . $nonce . '&postid=' . $post_id . '&rand=' . rand( 1, 99999 ); ?>" alt="" />
</div>
<div class="imgedit-submit">
<input type="button" onclick="imageEdit.close(<?php echo $post_id; ?>, 1)" class="button imgedit-cancel-btn" value="<?php esc_attr_e( 'Cancel' ); ?>" />
<input type="button" onclick="imageEdit.save(<?php echo "$post_id, '$nonce'"; ?>)" disabled="disabled" class="button button-primary imgedit-submit-btn" value="<?php esc_attr_e( 'Save' ); ?>" />
</div>
</div>
<div class="imgedit-settings">
<div class="imgedit-group">
<div class="imgedit-group-top">
<h2><?php _e( 'Scale Image' ); ?></h2>
<button type="button" class="dashicons dashicons-editor-help imgedit-help-toggle" onclick="imageEdit.toggleHelp(this);" aria-expanded="false"><span class="screen-reader-text"><?php esc_html_e( 'Scale Image Help' ); ?></span></button>
<div class="imgedit-help">
<p><?php _e( 'You can proportionally scale the original image. For best results, scaling should be done before you crop, flip, or rotate. Images can only be scaled down, not up.' ); ?></p>
</div>
<?php if ( isset( $meta['width'], $meta['height'] ) ) : ?>
<p>
<?php
printf(
/* translators: %s: Image width and height in pixels. */
__( 'Original dimensions %s' ),
'<span class="imgedit-original-dimensions">' . $meta['width'] . ' × ' . $meta['height'] . '</span>'
);
?>
</p>
<?php endif; ?>
<div class="imgedit-submit">
<fieldset class="imgedit-scale">
<legend><?php _e( 'New dimensions:' ); ?></legend>
<div class="nowrap">
<label for="imgedit-scale-width-<?php echo $post_id; ?>" class="screen-reader-text"><?php _e( 'scale width' ); ?></label>
<input type="text" id="imgedit-scale-width-<?php echo $post_id; ?>" onkeyup="imageEdit.scaleChanged(<?php echo $post_id; ?>, 1, this)" onblur="imageEdit.scaleChanged(<?php echo $post_id; ?>, 1, this)" value="<?php echo isset( $meta['width'] ) ? $meta['width'] : 0; ?>" />
<span class="imgedit-separator" aria-hidden="true">×</span>
<label for="imgedit-scale-height-<?php echo $post_id; ?>" class="screen-reader-text"><?php _e( 'scale height' ); ?></label>
<input type="text" id="imgedit-scale-height-<?php echo $post_id; ?>" onkeyup="imageEdit.scaleChanged(<?php echo $post_id; ?>, 0, this)" onblur="imageEdit.scaleChanged(<?php echo $post_id; ?>, 0, this)" value="<?php echo isset( $meta['height'] ) ? $meta['height'] : 0; ?>" />
<span class="imgedit-scale-warn" id="imgedit-scale-warn-<?php echo $post_id; ?>">!</span>
<div class="imgedit-scale-button-wrapper"><input id="imgedit-scale-button" type="button" onclick="imageEdit.action(<?php echo "$post_id, '$nonce'"; ?>, 'scale')" class="button button-primary" value="<?php esc_attr_e( 'Scale' ); ?>" /></div>
</div>
</fieldset>
</div>
</div>
</div>
<?php if ( $can_restore ) { ?>
<div class="imgedit-group">
<div class="imgedit-group-top">
<h2><button type="button" onclick="imageEdit.toggleHelp(this);" class="button-link" aria-expanded="false"><?php _e( 'Restore original image' ); ?> <span class="dashicons dashicons-arrow-down imgedit-help-toggle"></span></button></h2>
<div class="imgedit-help imgedit-restore">
<p>
<?php
_e( 'Discard any changes and restore the original image.' );
if ( ! defined( 'IMAGE_EDIT_OVERWRITE' ) || ! IMAGE_EDIT_OVERWRITE ) {
echo ' ' . __( 'Previously edited copies of the image will not be deleted.' );
}
?>
</p>
<div class="imgedit-submit">
<input type="button" onclick="imageEdit.action(<?php echo "$post_id, '$nonce'"; ?>, 'restore')" class="button button-primary" value="<?php esc_attr_e( 'Restore image' ); ?>" <?php echo $can_restore; ?> />
</div>
</div>
</div>
</div>
<?php } ?>
<div class="imgedit-group">
<div class="imgedit-group-top">
<h2><?php _e( 'Image Crop' ); ?></h2>
<button type="button" class="dashicons dashicons-editor-help imgedit-help-toggle" onclick="imageEdit.toggleHelp(this);" aria-expanded="false"><span class="screen-reader-text"><?php esc_html_e( 'Image Crop Help' ); ?></span></button>
<div class="imgedit-help">
<p><?php _e( 'To crop the image, click on it and drag to make your selection.' ); ?></p>
<p><strong><?php _e( 'Crop Aspect Ratio' ); ?></strong><br />
<?php _e( 'The aspect ratio is the relationship between the width and height. You can preserve the aspect ratio by holding down the shift key while resizing your selection. Use the input box to specify the aspect ratio, e.g. 1:1 (square), 4:3, 16:9, etc.' ); ?></p>
<p><strong><?php _e( 'Crop Selection' ); ?></strong><br />
<?php _e( 'Once you have made your selection, you can adjust it by entering the size in pixels. The minimum selection size is the thumbnail size as set in the Media settings.' ); ?></p>
</div>
</div>
<fieldset class="imgedit-crop-ratio">
<legend><?php _e( 'Aspect ratio:' ); ?></legend>
<div class="nowrap">
<label for="imgedit-crop-width-<?php echo $post_id; ?>" class="screen-reader-text"><?php _e( 'crop ratio width' ); ?></label>
<input type="text" id="imgedit-crop-width-<?php echo $post_id; ?>" onkeyup="imageEdit.setRatioSelection(<?php echo $post_id; ?>, 0, this)" onblur="imageEdit.setRatioSelection(<?php echo $post_id; ?>, 0, this)" />
<span class="imgedit-separator" aria-hidden="true">:</span>
<label for="imgedit-crop-height-<?php echo $post_id; ?>" class="screen-reader-text"><?php _e( 'crop ratio height' ); ?></label>
<input type="text" id="imgedit-crop-height-<?php echo $post_id; ?>" onkeyup="imageEdit.setRatioSelection(<?php echo $post_id; ?>, 1, this)" onblur="imageEdit.setRatioSelection(<?php echo $post_id; ?>, 1, this)" />
</div>
</fieldset>
<fieldset id="imgedit-crop-sel-<?php echo $post_id; ?>" class="imgedit-crop-sel">
<legend><?php _e( 'Selection:' ); ?></legend>
<div class="nowrap">
<label for="imgedit-sel-width-<?php echo $post_id; ?>" class="screen-reader-text"><?php _e( 'selection width' ); ?></label>
<input type="text" id="imgedit-sel-width-<?php echo $post_id; ?>" onkeyup="imageEdit.setNumSelection(<?php echo $post_id; ?>, this)" onblur="imageEdit.setNumSelection(<?php echo $post_id; ?>, this)" />
<span class="imgedit-separator" aria-hidden="true">×</span>
<label for="imgedit-sel-height-<?php echo $post_id; ?>" class="screen-reader-text"><?php _e( 'selection height' ); ?></label>
<input type="text" id="imgedit-sel-height-<?php echo $post_id; ?>" onkeyup="imageEdit.setNumSelection(<?php echo $post_id; ?>, this)" onblur="imageEdit.setNumSelection(<?php echo $post_id; ?>, this)" />
</div>
</fieldset>
</div>
<?php
if ( $thumb && $sub_sizes ) {
$thumb_img = wp_constrain_dimensions( $thumb['width'], $thumb['height'], 160, 120 );
?>
<div class="imgedit-group imgedit-applyto">
<div class="imgedit-group-top">
<h2><?php _e( 'Thumbnail Settings' ); ?></h2>
<button type="button" class="dashicons dashicons-editor-help imgedit-help-toggle" onclick="imageEdit.toggleHelp(this);" aria-expanded="false"><span class="screen-reader-text"><?php esc_html_e( 'Thumbnail Settings Help' ); ?></span></button>
<div class="imgedit-help">
<p><?php _e( 'You can edit the image while preserving the thumbnail. For example, you may wish to have a square thumbnail that displays just a section of the image.' ); ?></p>
</div>
</div>
<figure class="imgedit-thumbnail-preview">
<img src="<?php echo $thumb['url']; ?>" width="<?php echo $thumb_img[0]; ?>" height="<?php echo $thumb_img[1]; ?>" class="imgedit-size-preview" alt="" draggable="false" />
<figcaption class="imgedit-thumbnail-preview-caption"><?php _e( 'Current thumbnail' ); ?></figcaption>
</figure>
<div id="imgedit-save-target-<?php echo $post_id; ?>" class="imgedit-save-target">
<fieldset>
<legend><?php _e( 'Apply changes to:' ); ?></legend>
<span class="imgedit-label">
<input type="radio" id="imgedit-target-all" name="imgedit-target-<?php echo $post_id; ?>" value="all" checked="checked" />
<label for="imgedit-target-all"><?php _e( 'All image sizes' ); ?></label>
</span>
<span class="imgedit-label">
<input type="radio" id="imgedit-target-thumbnail" name="imgedit-target-<?php echo $post_id; ?>" value="thumbnail" />
<label for="imgedit-target-thumbnail"><?php _e( 'Thumbnail' ); ?></label>
</span>
<span class="imgedit-label">
<input type="radio" id="imgedit-target-nothumb" name="imgedit-target-<?php echo $post_id; ?>" value="nothumb" />
<label for="imgedit-target-nothumb"><?php _e( 'All sizes except thumbnail' ); ?></label>
</span>
<?php
if ( $edit_custom_sizes ) {
if ( ! is_array( $edit_custom_sizes ) ) {
$edit_custom_sizes = get_intermediate_image_sizes();
}
foreach ( array_unique( $edit_custom_sizes ) as $key => $size ) {
if ( array_key_exists( $size, $meta['sizes'] ) ) {
if ( 'thumbnail' === $size ) {
continue;
}
?>
<span class="imgedit-label">
<input type="radio" id="imgedit-target-custom<?php echo esc_attr( $key ); ?>" name="imgedit-target-<?php echo $post_id; ?>" value="<?php echo esc_attr( $size ); ?>" />
<label for="imgedit-target-custom<?php echo esc_attr( $key ); ?>"><?php echo esc_html( $size ); ?></label>
</span>
<?php
}
}
}
?>
</fieldset>
</div>
</div>
<?php } ?>
</div>
</div>
<div class="imgedit-wait" id="imgedit-wait-<?php echo $post_id; ?>"></div>
<div class="hidden" id="imgedit-leaving-<?php echo $post_id; ?>"><?php _e( "There are unsaved changes that will be lost. 'OK' to continue, 'Cancel' to return to the Image Editor." ); ?></div>
</div>
<?php
}
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：
$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：
$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：
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：
get_users `函数获取用户列表。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：
$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：
$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：
$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。
使用PHP在WordPress中添加自定义功能可以通过以下方式实现：
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：
// 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
}
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。
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：
do_action( 'save_post', $post_ID, $post );
这里，$post_ID 和 $post 是传递给钩子函数的参数。
使用 wp_get_current_user 获取当前登录用户的信息：
$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;
