代码实现WordPress添加本地头像功能代替Gravatar头像

发布于 2022.08.20

今天就来教大家使用代码将 Gravatar 头像半本地化,那么什么是半本地化呢？也就是通过用户的邮箱判断用户是…

今天就来教大家使用代码将 Gravatar 头像半本地化,那么什么是半本地化呢？也就是通过用户的邮箱判断用户是否拥有 Gravatar 头像，如果拥有则使用 Gravatar 头像，当用户拥有本地头像且拥有 Gravatar 头像时，则优先使用本地头像。

```
<?php
```
```
class Simple_Local_Avatars {
```
```
    private $user_id_being_edited;
```
```
    public function __construct() {
```

        add_filter( 'get_avatar', array( $this, 'get_avatar' ), 10, 5 );

        add_action( 'admin_init', array( $this, 'admin_init' ) );

        add_action( 'show_user_profile', array( $this, 'edit_user_profile' ) );

        add_action( 'edit_user_profile', array( $this, 'edit_user_profile' ) );

        add_action( 'personal_options_update', array( $this, 'edit_user_profile_update' ) );

        add_action( 'edit_user_profile_update', array( $this, 'edit_user_profile_update' ) );

        add_filter( 'avatar_defaults', array( $this, 'avatar_defaults' ) );

```
    }
```

    public function get_avatar( $avatar = '', $id_or_email, $size = 96, $default = '', $alt = false ) {

```
        if ( is_numeric($id_or_email) )
```

            $user_id = (int) $id_or_email;

        elseif ( is_string( $id_or_email ) && ( $user = get_user_by( 'email', $id_or_email ) ) )

```
            $user_id = $user->ID;
```

        elseif ( is_object( $id_or_email ) && ! empty( $id_or_email->user_id ) )

            $user_id = (int) $id_or_email->user_id;

```
        if ( empty( $user_id ) )
```
```
            return $avatar;
```

        $local_avatars = get_user_meta( $user_id, 'simple_local_avatar', true );

        if ( empty( $local_avatars ) || empty( $local_avatars['full'] ) )

```
            return $avatar;
```
```
        $size = (int) $size;
```
```
        if ( empty( $alt ) )
```

            $alt = get_the_author_meta( 'display_name', $user_id );

```
        // generate a new size
```

        if ( empty( $local_avatars[$size] ) ) {

            $upload_path = wp_upload_dir();

            $avatar_full_path = str_replace( $upload_path['baseurl'], $upload_path['basedir'], $local_avatars['full'] );

            $image_sized = image_resize( $avatar_full_path, $size, $size, true );

            // deal with original being >= to original image (or lack of sizing ability)

            $local_avatars[$size] = is_wp_error($image_sized) ? $local_avatars[$size] = $local_avatars['full'] : str_replace( $upload_path['basedir'], $upload_path['baseurl'], $image_sized );

            // save updated avatar sizes

            update_user_meta( $user_id, 'simple_local_avatar', $local_avatars );

        } elseif ( substr( $local_avatars[$size], 0, 4 ) != 'http' ) {

            $local_avatars[$size] = home_url( $local_avatars[$size] );

```
        }
```

        $author_class = is_author( $user_id ) ? ' current-author' : '' ;

        $avatar = "<img alt='" . esc_attr( $alt ) . "' src='" . $local_avatars[$size] . "' class='avatar avatar-{$size}{$author_class} photo' height='{$size}' width='{$size}' />";

        return apply_filters( 'simple_local_avatar', $avatar );

```
    }
```
```
    public function admin_init() {
```

        //load_plugin_textdomain( 'simple-local-avatars', false, dirname( plugin_basename( __FILE__ ) ) . '/localization/' );

        register_setting( 'discussion', 'simple_local_avatars_caps', array( $this, 'sanitize_options' ) );

        add_settings_field( 'simple-local-avatars-caps', __('Local Avatar Permissions','simple-local-avatars'), array( $this, 'avatar_settings_field' ), 'discussion', 'avatars' );

```
    }
```

    public function sanitize_options( $input ) {

        $new_input['simple_local_avatars_caps'] = empty( $input['simple_local_avatars_caps'] ) ? 0 : 1;

```
        return $new_input;
```
```
    }
```

    public function avatar_settings_field( $args ) {

        $options = get_option('simple_local_avatars_caps');

```
        echo '
```

            <label for="simple_local_avatars_caps">

                <input type="checkbox" name="simple_local_avatars_caps" id="simple_local_avatars_caps" value="1" ' . @checked( $options['simple_local_avatars_caps'], 1, false ) . ' />

                ' . __('仅具有头像上传权限的用户具有设置本地头像权限（作者及更高等级角色）。','simple-local-avatars') . '

```
            </label>
```
```
        ';
```
```
    }
```

    public function edit_user_profile( $profileuser ) {

```
    ?>
```

    <h3><?php _e( '头像','simple-local-avatars' ); ?></h3>

```
    <table class="form-table">
```
```
        <tr>
```

            <th><label for="simple-local-avatar"><?php _e('上传头像','simple-local-avatars'); ?></label></th>

            <td style="width: 50px;" valign="top">

                <?php echo get_avatar( $profileuser->ID ); ?>

```
            </td>
```
```
            <td>
```
```
            <?php
```

                $options = get_option('simple_local_avatars_caps');

                if ( empty($options['simple_local_avatars_caps']) || current_user_can('upload_files') ) {

                    do_action( 'simple_local_avatar_notices' );

                    wp_nonce_field( 'simple_local_avatar_nonce', '_simple_local_avatar_nonce', false );

```
            ?>
```

                    <input type="file" name="simple-local-avatar" id="simple-local-avatar" /><br />

```
            <?php
```

                    if ( empty( $profileuser->simple_local_avatar ) )

                        echo '<span class="description">' . __('尚未设置本地头像，请点击“浏览”按钮上传本地头像。','simple-local-avatars') . '</span>';

```
                    else
```
```
                        echo '
```

                            <input type="checkbox" name="simple-local-avatar-erase" value="1" /> ' . __('移除本地头像','simple-local-avatars') . '<br />

                            <span class="description">' . __('如需要修改本地头像，请重新上传新头像。如需要移除本地头像，请选中上方的“移除本地头像”复选框并更新个人资料即可。<br/>移除本地头像后，将恢复使用 Gravatar 头像。','simple-local-avatars') . '</span>

```
                        ';
```
```
                } else {
```

                    if ( empty( $profileuser->simple_local_avatar ) )

                        echo '<span class="description">' . __('尚未设置本地头像，请在 Gravatar.com 网站设置头像。','simple-local-avatars') . '</span>';

```
                    else
```

                        echo '<span class="description">' . __('你没有头像上传全乡，如需要修改本地头像，请联系站点管理员。','simple-local-avatars') . '</span>';

```
                }
```
```
            ?>
```
```
            </td>
```
```
        </tr>
```
```
    </table>
```

    <script type="text/javascript">var form = document.getElementById('your-profile');form.encoding = 'multipart/form-data';form.setAttribute('enctype', 'multipart/form-data');</script>

```
    <?php
```
```
    }
```

    public function edit_user_profile_update( $user_id ) {

        if ( ! isset( $_POST['_simple_local_avatar_nonce'] ) || ! wp_verify_nonce( $_POST['_simple_local_avatar_nonce'], 'simple_local_avatar_nonce' ) )            //security

```
            return;
```

        if ( ! empty( $_FILES['simple-local-avatar']['name'] ) ) {

```
            $mimes = array(
```

                'jpg|jpeg|jpe' => 'image/jpeg',

```
                'gif' => 'image/gif',
```
```
                'png' => 'image/png',
```
```
                'bmp' => 'image/bmp',
```

                'tif|tiff' => 'image/tiff'

```
            );
```

            // front end (theme my profile etc) support

            if ( ! function_exists( 'wp_handle_upload' ) )

                require_once( ABSPATH . 'wp-admin/includes/file.php' );

            $this->avatar_delete( $user_id );    // delete old images if successful

            // need to be more secure since low privelege users can upload

            if ( strstr( $_FILES['simple-local-avatar']['name'], '.php' ) )

                wp_die('For security reasons, the extension ".php" cannot be in your file name.');

            $this->user_id_being_edited = $user_id; // make user_id known to unique_filename_callback function

            $avatar = wp_handle_upload( $_FILES['simple-local-avatar'], array( 'mimes' => $mimes, 'test_form' => false, 'unique_filename_callback' => array( $this, 'unique_filename_callback' ) ) );

            if ( empty($avatar['file']) ) {     // handle failures

                switch ( $avatar['error'] ) {

                    case 'File type does not meet security guidelines. Try another.' :

                        add_action( 'user_profile_update_errors', create_function('$a','$a->add("avatar_error",__("请上传有效的图片文件。","simple-local-avatars"));') );

```
                        break;
```
```
                    default :
```

                        add_action( 'user_profile_update_errors', create_function('$a','$a->add("avatar_error","<strong>".__("上传头像过程中出现以下错误：","simple-local-avatars")."</strong> ' . esc_attr( $avatar['error'] ) . '");') );

```
                }
```
```
                return;
```
```
            }
```

            update_user_meta( $user_id, 'simple_local_avatar', array( 'full' => $avatar['url'] ) );      // save user information (overwriting old)

        } elseif ( ! empty( $_POST['simple-local-avatar-erase'] ) ) {

            $this->avatar_delete( $user_id );

```
        }
```
```
    }
```
```
    /**
```

     * remove the custom get_avatar hook for the default avatar list output on options-discussion.php

```
     */
```

    public function avatar_defaults( $avatar_defaults ) {

        remove_action( 'get_avatar', array( $this, 'get_avatar' ) );

```
        return $avatar_defaults;
```
```
    }
```
```
    /**
```
```
     * delete avatars based on user_id
```
```
     */
```

    public function avatar_delete( $user_id ) {

        $old_avatars = get_user_meta( $user_id, 'simple_local_avatar', true );

```
        $upload_path = wp_upload_dir();
```
```
        if ( is_array($old_avatars) ) {
```

            foreach ($old_avatars as $old_avatar ) {

                $old_avatar_path = str_replace( $upload_path['baseurl'], $upload_path['basedir'], $old_avatar );

                @unlink( $old_avatar_path );

```
            }
```
```
        }
```

        delete_user_meta( $user_id, 'simple_local_avatar' );

```
    }
```

    public function unique_filename_callback( $dir, $name, $ext ) {

        $user = get_user_by( 'id', (int) $this->user_id_being_edited );

        $name = $base_name = sanitize_file_name( substr(md5($user->user_login),0,12) . '_avatar' );

```
        $number = 1;
```

        while ( file_exists( $dir . "/$name$ext" ) ) {

            $name = $base_name . '_' . $number;

```
            $number++;
```
```
        }
```
```
        return $name . $ext;
```
```
    }
```
```
}
```

$simple_local_avatars = new Simple_Local_Avatars;

function get_simple_local_avatar( $id_or_email, $size = '96', $default = '', $alt = false ) {

```
    global $simple_local_avatars;
```

    $avatar = $simple_local_avatars->get_avatar( '', $id_or_email, $size, $default, $alt );

```
    if ( empty ( $avatar ) )
```

        $avatar = get_avatar( $id_or_email, $size, $default, $alt );

```
    return $avatar;
```
```
}
```

将以上代码加入到 functions.php 或者 functions.php 引入的 php 文件中即可实现 Gravatar 头像半本地化，最后来张效果图：

类别：WordPress教程、

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