Suppression d'un avatar personnalisé

Question

Bonjour, j'ai implémenté un téléchargement d'avatar personnalisé à partir du frontal dans mon thème WordPress. Ça fonctionne. L'utilisateur peut ajouter et supprimer l'avatar personnalisé. Mon problème est que lorsque l'utilisateur sélectionne pour supprimer son avatar personnalisé, il le supprime d'Avatar Meta mais les fichiers d'image Avatar téléchargés restent dans le serveur. Ce que je veux faire, c'est aussi forcer la suppression des fichiers d'image d'Avatar du serveur. Ceci est le modèle de user_profile.php;

<?php
global $current_user, $wp_roles;
get_currentuserinfo();

?>
<div class="entry-content entry">
    <?php the_content(); 

      if ( isset($_REQUEST['error']) && $_REQUEST['error'] == 'true' ){ 
          $error = __('The passwords you entered do not match.  Your password was not updated.', 'cosmotheme');
      }elseif( isset($_REQUEST['success']) && $_REQUEST['success'] == 'true' ){
          $success = __('Your profile info was updated.', 'cosmotheme');
      }


      if ( $error ) echo '<p class="error">' . $error . '</p>'; 
      if ( isset($success) ) echo '<p class="success">' . $success . '</p>'; 

    ?>


    <?php if ( !is_user_logged_in() ) : ?>
            <p class="warning">
                <?php _e('You must be logged in to edit your profile.', 'cosmotheme'); ?>
            </p><!-- .warning -->
    <?php else : ?>
        <?php 


        ?>
<form method="post" id="adduser" action="<?php the_permalink(); ?>">
<div class="tabs-container form-profile-pic">
<?php
$action['group'] = 'avatar';
$action['topic'] = 'upload';
$action['index'] = '';
$action['upload_url'] =  home_url().'/wp-admin/media-upload.php?post_id=-1&amp;type=image&amp;TB_iframe=true';

$custom_avatar_url = '';    
$custom_avatar_meta =  get_user_meta($current_user->id, 'custom_avatar', true);
if(is_numeric($custom_avatar_meta) && $custom_avatar_meta > 0){
$custom_avatar_url = wp_get_attachment_url($custom_avatar_meta);
}
?>
<label for="profile-pic"><?php _e('Profile picture', 'cosmotheme'); ?></label>
<p class="button"><input type="button" class="button-primary front_post_input" id="upload_btn" value="<?php _e('Choose file','cosmotheme'); ?>" <?php echo fields::action( $action , 'extern-upload-id' ) ?>  /></p>
<input type="text" name="image" value="<?php echo $custom_avatar_url; ?>" class="generic-record front_post_input" id="avatar_upload"  onclick="jQuery('#upload_btn').click();"  />
<label class="remove-avatar" for="remove_avatar"><input type="checkbox" name="remove_avatar" <?php echo $disabled ?> value="1" id="remove_avatar"> <?php _e('Remove avatar', 'cosmotheme'); ?></label>
<input type="hidden" name="avatar_id" id="avatar_upload_id" value="<?php echo $custom_avatar_meta; ?>"  class="generic-record generic-single-record " />
</div><!-- .profile pic -->  
            <div class="tabs-container form-username">
                <label for="user-name"><?php _e('Username', 'cosmotheme'); ?></label>
                <input class="text-input" name="user-name" type="text" id="user-name" disabled value="<?php the_author_meta( 'user_login', $current_user->id ); ?>" />
            </div><!-- .form-username -->
            <div class="tabs-container form-username">
                <label for="first-name"><?php _e('First name', 'cosmotheme'); ?></label>
                <input class="text-input" name="first-name" type="text" id="first-name" <?php echo $disabled ?> value="<?php the_author_meta( 'user_firstname', $current_user->id ); ?>" />
            </div><!-- .form-username -->
            <div class="tabs-container form-username">
                <label for="last-name"><?php _e('Last name', 'cosmotheme'); ?></label>
                <input class="text-input" name="last-name" type="text" id="last-name" <?php echo $disabled ?> value="<?php the_author_meta( 'user_lastname', $current_user->id ); ?>" />
            </div><!-- .form-username -->
            <div class="tabs-container form-email">
                <label for="email"><?php _e('E-mail *', 'cosmotheme'); ?></label>
                <input class="text-input" name="email" type="text" id="email" <?php echo $disabled ?> value="<?php the_author_meta( 'user_email', $current_user->id ); ?>" />
            </div><!-- .form-email -->
            <div class="tabs-container form-url">
                <label for="url"><?php _e('Website', 'cosmotheme'); ?></label>
                <input class="text-input" name="url" type="text" id="url" <?php echo $disabled ?> value="<?php the_author_meta( 'user_url', $current_user->id ); ?>" />
            </div><!-- .form-url -->
            <div class="tabs-container form-password">
                <label for="pass1"><?php _e('Password *', 'cosmotheme'); ?> </label>
                <input class="text-input" name="pass1" <?php echo $disabled ?> type="password" id="pass1" />
            </div><!-- .form-password -->
            <div class="tabs-container form-password">
                <label for="pass2"><?php _e('Repeat password *', 'cosmotheme'); ?></label>
                <input class="text-input" name="pass2" <?php echo $disabled ?> type="password" id="pass2" />
            </div><!-- .form-password -->
            <div class="tabs-container form-textarea">
                <label for="description"><?php _e('Biographical information', 'cosmotheme') ?></label>
                <textarea name="description" id="description" <?php echo $disabled ?> rows="3" cols="50"><?php the_author_meta( 'description', $current_user->id ); ?></textarea>
            </div><!-- .form-textarea -->
            <p class="form-submit">
                <?php //echo $referer; ?>
                <input name="updateuser" type="submit" id="updateuser" <?php echo $disabled ?> class="submit button" value="<?php _e('Update', 'cosmotheme'); ?>" />
                <?php wp_nonce_field( 'update-user' ) ?>
                <input name="action" type="hidden" id="action" <?php echo $disabled ?> value="update-user" />
            </p><!-- .form-submit -->
        </form><!-- #adduser -->
        <?php endif; ?>
    </div><!-- .entry-content -->  

Et c'est le user_profile_update.php;

<?php

/* Get user info. */
global $current_user, $wp_roles;
get_currentuserinfo();

/* Load the registration file. */
//require_once( ABSPATH . WPINC . '/registration.php' );

/* If profile was saved, update profile. */
if ( 'POST' == $_SERVER['REQUEST_METHOD'] && !empty( $_POST['action'] ) && $_POST['action'] == 'update-user' && ( !defined('IS_FOR_DEMO' ) || get_the_author_meta( 'user_login', $current_user->id ) != 'demo') ) {

    /* Update user password. */
    if ( !empty($_POST['pass1'] ) && !empty( $_POST['pass2'] ) ) { 
        if ( $_POST['pass1'] == $_POST['pass2'] ){
            wp_update_user( array( 'ID' => $current_user->id, 'user_pass' => esc_attr( $_POST['pass1'] ) ) );
        }else{
            $error = __('The passwords you entered do not match.  Your password was not updated.', 'cosmotheme');
        }
    }

    /* Update user information. */
    if ( !empty( $_POST['url'] ) )
        update_user_meta( $current_user->id, 'user_url', esc_url( $_POST['url'] ) );
    if ( !empty( $_POST['email'] ) )
        update_user_meta( $current_user->id, 'user_email', esc_attr( $_POST['email'] ) );
    if ( !empty( $_POST['first-name'] ) ) {
         update_user_meta( $current_user->id, 'first_name', esc_attr( $_POST['first-name'] ) ); 
    }
    if ( !empty( $_POST['last-name'] ) )
        update_user_meta($current_user->id, 'last_name', esc_attr( $_POST['last-name'] ) );
    if ( !empty( $_POST['description'] ) )
        update_user_meta( $current_user->id, 'description', esc_attr( $_POST['description'] ) );

    if ( !empty( $_POST['avatar_id'] )  && $_POST['avatar_id'] != get_user_meta($current_user->id, 'custom_avatar', true) && empty( $_POST['remove_avatar'])){ 
        update_user_meta( $current_user->id, 'custom_avatar', esc_attr( $_POST['avatar_id'] ) );
    }elseif( !empty( $_POST['remove_avatar']) && $_POST['remove_avatar'] == 1){
        update_user_meta( $current_user->id, 'custom_avatar', '-1' );
    }
    /* Redirect so the page will show updated info. */
   // if ( !$error ) {
        $redirect_url   = get_permalink();
                if(isset($error) && $error != ''){  
                    $msg        = array( 'error' => "true" );
                }else{  
                    $msg        = array( 'success' => "true" ); 
                }
                $_url    = add_query_arg( $msg , $redirect_url );

        wp_redirect( $_url );
        exit;
   // }
}
?>

Comme vous pouvez le voir si l'utilisateur vérifie l'entrée "Supprimer Avatar", je met à jour la méta-1 personnalisée de Custom_avatar, ce qui le rend invisible. Cela fonctionne, mais comme je l'ai déjà dit, je dois également forcer la suppression du fichier image du serveur. Pouvez-vous m'aider? Merci.