
wp_image_editor ( $post_id, $msg = false )
wp_image_editor: 這個函式用來為一個給定的影象檔案建立一個影象編輯器物件。它接受一個引數,即影象檔案的路徑,並返回一個可用於操作影象的物件。
載入WP影象編輯介面。
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
`函式獲取所有使用者列表,可以按照以下步驟進行:
1. 使用` get_users
`函式呼叫獲取使用者列表:
$users = get_users();
2. 您可以按需使用引數來過濾結果。例如,您可以通過角色、使用者ID、使用者登入名等過濾使用者列表。以下是一個根據使用者角色為過濾條件的示例:
$users = get_users( array( 'role' => 'subscriber' // 將角色名稱替換為您要過濾的角色 ) );
在上述示例中,將` role
`引數設定為所需的角色名稱來過濾使用者列表。
3. 您可以使用迴圈遍歷獲取的使用者列表,並訪問每個使用者的屬性。例如,以下示例將顯示每個使用者的使用者名稱和電子郵件地址:
foreach( $users as $user ) { echo '使用者名稱:' . $user->user_login . ', 電子郵件:' . $user->user_email . ; }
在上述示例中,通過` $user->user_login
`和` $user->user_email
`訪問每個使用者的使用者名稱和電子郵件地址。
請注意,` get_users
`函式預設返回所有使用者,並可以根據需要使用更多引數進行過濾。您可以參閱WordPress官方文件中的` get_users
`函式文件,瞭解更多可用引數和用法示例。
總結起來,使用` get_users
`函式獲取所有使用者列表的步驟是:
get_users
`函式獲取使用者列表。在WordPress中,可以使用WP_PLUGIN_DIR和WP_PLUGIN_URL常量來定義外掛的目錄路徑和URL。
1. `WP_PLUGIN_DIR`:這是一個常量,用於定義外掛的目錄路徑(檔案系統路徑)。您可以使用以下程式碼在外掛檔案中訪問該常量:
$plugin_dir = WP_PLUGIN_DIR . '/your-plugin-folder/';
在上述程式碼中,將"your-plugin-folder"替換為您外掛的實際資料夾名稱。使用該常量,您可以獲取外掛檔案的完整路徑。
2. `WP_PLUGIN_URL`:這是一個常量,用於定義外掛的URL(用於在網頁上訪問外掛檔案)。以下是一個使用該常量的示例:
$plugin_url = WP_PLUGIN_URL . '/your-plugin-folder/';
同樣,請將"your-plugin-folder"替換為您外掛的實際資料夾名稱。使用該常量,您可以獲取外掛在網頁上的完整URL。
請注意,`WP_PLUGIN_DIR`和`WP_PLUGIN_URL`常量在WordPress版本2.6之後引入。從WordPress 5.5版本開始,這兩個常量被標記為過時(deprecated),因為WordPress更傾向於使用新的外掛檔案結構。如果您正在開發新外掛,建議使用新的外掛檔案結構和相關函式。
在新的外掛檔案結構中,可以使用以下函式來獲取外掛的目錄路徑和URL:
- `plugin_dir_path()`:獲取外掛目錄路徑。
- `plugin_dir_url()`:獲取外掛URL。
這些函式會自動將外掛的版本、多站點和SSL等考慮因素納入計算。
總結起來,使用`WP_PLUGIN_DIR`和`WP_PLUGIN_URL`常量定義外掛的目錄和URL的方法是:
$plugin_dir = WP_PLUGIN_DIR . '/your-plugin-folder/'; $plugin_url = WP_PLUGIN_URL . '/your-plugin-folder/';
但請注意,這兩個常量已被標記為過時,建議使用新的外掛檔案結構和相關函式來獲取外掛的路徑和URL。
使用PHP在WordPress中新增自定義功能可以通過以下方式實現:
下面是一個實操示例。
要在WordPress中新增自定義功能,可以按照以下步驟使用PHP編寫並新增自定義功能:
// 新增自定義功能示例 // 1. 建立自定義短程式碼 function custom_shortcode() { return '這是我的自定義短程式碼內容'; } add_shortcode('custom', 'custom_shortcode'); // 2. 自定義小工具 function custom_widget() { echo '這是我的自定義小工具內容'; } register_widget('custom_widget'); // 3. 自定義選單 function custom_menu() { register_nav_menu('custom-menu', '自定義選單'); } add_action('after_setup_theme', 'custom_menu'); // 4. 自定義頁面模板 function custom_page_template() { /* Template Name: 自定義模板 */ // 自定義模板的內容和樣式 }
請注意,修改主題檔案可以在主題更新時丟失,因此建議在進行任何更改之前備份functions.php檔案。此外,為避免不必要的錯誤和衝突,建議在新增自定義功能前先了解WordPress開發文件和最佳實踐,以確保正確、安全地實現所需的自定義功能。
使用 do_action
函式可以觸發一個鉤子函式。do_action
函式的引數與要觸發的鉤子函式的引數相同。
例如,觸發save_post鉤子函式的程式碼如下:
do_action( 'save_post', $post_ID, $post );
這裡,$post_ID
和 $post
是傳遞給鉤子函式的引數。
使用 wp_get_current_user
獲取當前登入使用者的資訊:
$current_user = wp_get_current_user(); // 獲取當前使用者的ID $user_id = $current_user->ID; // 獲取當前使用者的使用者名稱 $user_login = $current_user->user_login; // 獲取當前使用者的郵箱 $user_email = $current_user->user_email; // 獲取當前使用者的顯示名稱 $display_name = $current_user->display_name;