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禁止gravatar设置本地avatar所有代码，如果设置了头像就用头像否则用名字的前两个生成头像字符

wptutor 禁止gravatar设置本地avatar所有代码，如果设置了头像就用头像否则用名字的前两个生成头像字符已关闭评论 62 浏览量

这个只有部分能用，更新版本在下面

/**
 * Local custom avatar system with SVG initials generator
 * - Uses user's custom avatar if exists
 * - Otherwise generates SVG avatar with random color + initials
 */
add_filter('pre_get_avatar', 'custom_svg_initials_avatar', 10, 3);

function custom_svg_initials_avatar($avatar, $id_or_email, $args) {

    $user = false;

    // Detect registered user
    if (is_numeric($id_or_email)) {
        $user = get_user_by('id', (int) $id_or_email);
    } elseif (is_object($id_or_email) && !empty($id_or_email->user_id)) {
        $user = get_user_by('id', (int) $id_or_email->user_id);
    } elseif (is_string($id_or_email)) {
        $user = get_user_by('email', $id_or_email);
    }

    /** --- 1. If user has custom uploaded avatar → use it --- */
    if ($user) {
        $custom = get_user_meta($user->ID, 'custom_avatar', true);
        if (!empty($custom)) {
            return build_avatar_img($custom, $args);
        }
    }

    /** --- 2. Otherwise generate initials avatar --- */
    $name = '';

    if ($user) {
        $name = $user->display_name;
    } elseif (is_object($id_or_email) && !empty($id_or_email->comment_author)) {
        $name = $id_or_email->comment_author;
    } elseif (is_string($id_or_email)) {
        $name = $id_or_email;
    }

    $initials = strtoupper(get_initials_from_name($name));
    $size = isset($args['size']) ? (int) $args['size'] : 96;

    // Deterministic random color based on name/email
    $hash = md5($name);
    $color = "#" . substr($hash, 0, 6);

    // Generate SVG
    $svg = create_svg_avatar($initials, $color, $size);

    // Output SVG as data URI
    $data_uri = 'data:image/svg+xml;base64,' . base64_encode($svg);

    return build_avatar_img($data_uri, $args);
}


/**
 * Create actual <img> tag for avatars
 */
function build_avatar_img($src, $args) {
    $size  = isset($args['size'])  ? (int) $args['size']  : 96;
    $alt   = isset($args['alt'])   ? esc_attr($args['alt']) : '';
    $class = isset($args['class']) ? esc_attr($args['class']) : 'avatar';

    return sprintf(
        '<img alt="%s" src="%s" class="avatar %s photo" height="%d" width="%d" />',
        $alt,
        esc_url($src),
        $class,
        $size,
        $size
    );
}


/**
 * Extract initials from name or email
 */
function get_initials_from_name($name) {
    if (empty($name)) return '?';
    
    // If name contains spaces → use first two initials
    $parts = preg_split('/\s+/', trim($name));
    if (count($parts) >= 2) {
        return mb_substr($parts[0], 0, 1) . mb_substr($parts[1], 0, 1);
    }

    // Single name → use first letter
    return mb_substr($name, 0, 1);
}


/**
 * Generate the SVG code
 */
function create_svg_avatar($initials, $bg_color, $size) {
    $font_size = $size * 0.4;

    return '
<svg xmlns="http://www.w3.org/2000/svg" width="'.$size.'" height="'.$size.'">
  <rect width="100%" height="100%" fill="'.$bg_color.'" />
  <text x="50%" y="50%" font-size="'.$font_size.'"
        fill="#ffffff" dy=".35em" text-anchor="middle"
        font-family="Arial, sans-serif" font-weight="bold">
    '.$initials.'
  </text>
</svg>';
}



// Disable Gravatar (safe for custom avatars)
add_filter( 'pre_option_show_avatars', '__return_zero' );
add_filter( 'avatar_defaults', '__return_empty_array' );

// Prevent Gravatar URL generation
add_filter( 'get_avatar_data', function( $args ) {
    // If your custom avatar returned a URL, skip blocking
    if (strpos($args['url'], 'default-avatar.png') !== false || strpos($args['url'], 'custom_avatar') !== false) {
        return $args;
    }

    // Otherwise block Gravatar fallback
    $args['url'] = '';
    return $args;
});



add_filter('get_avatar', 'custom_svg_avatar_for_comments', 10, 6);



function custom_svg_avatar_for_comments($avatar, $id_or_email, $size, $default, $alt, $args) {
    // Force WordPress to use pre_get_avatar logic
    $custom = apply_filters('pre_get_avatar', null, $id_or_email, $args);

    // If pre_get_avatar returned our custom avatar → replace the default one
    if (!empty($custom)) {
        return $custom;
    }

    return $avatar;
}

更新版本

<?php
/**
 * Local custom avatar system with SVG initials generator
 * * Logic:
 * 1. Hook into pre_get_avatar.
 * 2. If we return an <img> tag string, WordPress stops there (disabling Gravatar naturally).
 * 3. We detect if it's a registered user with a custom upload.
 * 4. If not, we generate an SVG Data URI.
 * 5. We bypass esc_url for Data URIs to prevent the src="" bug.
 */

add_filter('pre_get_avatar', 'custom_svg_initials_avatar', 10, 3);

function custom_svg_initials_avatar($avatar, $id_or_email, $args) {

    $user = false;
    $user_id = 0;

    // 1. Normalize User Detection
    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;
    }

    // 2. Check for Custom Uploaded Image (Meta field: 'custom_avatar')
    if ($user_id > 0) {
        $custom_url = get_user_meta($user_id, 'custom_avatar', true);
        if (!empty($custom_url)) {
            return build_avatar_img($custom_url, $args);
        }
    }

    // 3. Fallback: Generate SVG Initials
    // Determine the name to display
    $name = '';
    if ($user_id > 0) {
        $user_data = get_userdata($user_id);
        $name = $user_data->display_name;
    } elseif (is_object($id_or_email) && !empty($id_or_email->comment_author)) {
        $name = $id_or_email->comment_author;
    } else {
        // Fallback for purely email inputs on comments
        $name = is_string($id_or_email) ? $id_or_email : 'Visitor';
    }

    // Generate Initials & Color
    $initials = strtoupper(get_initials_from_name($name));
    $size = isset($args['size']) ? (int) $args['size'] : 96;
    
    // Create a unique color based on the name string so it's consistent for the user
    $hash = md5($name);
    $color = '#' . substr($hash, 0, 6);

    // Generate SVG HTML
    $svg = create_svg_avatar($initials, $color, $size);

    // Encode as Data URI
    $data_uri = 'data:image/svg+xml;base64,' . base64_encode($svg);

    return build_avatar_img($data_uri, $args);
}

/**
 * Helper: Build the <img> tag safely
 */
function build_avatar_img($src, $args) {
    $size  = isset($args['size'])  ? (int) $args['size']  : 96;
    $alt   = isset($args['alt'])   ? $args['alt'] : '';
    $class = isset($args['class']) ? $args['class'] : 'avatar';
    
    // Sanitize classes
    $class_safe = esc_attr($class . ' avatar-' . $size . ' photo');
    
    // CRITICAL FIX: 
    // If it's a Data URI, esc_url() will strip it. We must use esc_attr() instead.
    if (strpos($src, 'data:image') === 0) {
        $src_safe = esc_attr($src);
    } else {
        $src_safe = esc_url($src);
    }

    return sprintf(
        '<img alt="%s" src="%s" class="%s" height="%d" width="%d" loading="lazy" />',
        esc_attr($alt),
        $src_safe,
        $class_safe,
        $size,
        $size
    );
}

/**
 * Helper: Extract Initials
 */
function get_initials_from_name($name) {
    if (empty($name)) return '?';
    
    // Strip special chars/numbers for cleaner initials
    $clean_name = trim(preg_replace('/[0-9@\.]/', '', $name));
    
    if (empty($clean_name)) $clean_name = $name; // Fallback if name was only numbers/emails

    $parts = preg_split('/\s+/', $clean_name);
    
    if (count($parts) >= 2) {
        return mb_substr($parts[0], 0, 1) . mb_substr($parts[1], 0, 1);
    }

    return mb_substr($name, 0, 1);
}

/**
 * Helper: Generate SVG Code
 */
function create_svg_avatar($initials, $bg_color, $size) {
    // Dynamic font size relative to container
    $font_size = round($size * 0.45);
    
    return '
    <svg xmlns="http://www.w3.org/2000/svg" width="'.$size.'" height="'.$size.'" viewBox="0 0 '.$size.' '.$size.'">
      <rect width="100%" height="100%" fill="'.$bg_color.'" />
      <text x="50%" y="50%" dy=".35em" 
            font-size="'.$font_size.'" 
            fill="#ffffff" 
            text-anchor="middle" 
            font-family="sans-serif, Arial" 
            font-weight="bold">
        '.$initials.'
      </text>
    </svg>';
}

/**
 * CLEANUP: 
 * We do NOT need to hook into 'pre_option_show_avatars' or 'get_avatar_data'.
 * By returning a value in 'pre_get_avatar' above, we effectively short-circuit 
 * WordPress standard Gravatar logic.
 */

更新版本，添加了pre_get_avatar_data的钩子能直接用get_avatar_url获取到头像的url

<?php
/**
 * User Avatar
 * Version: 2.0
 * Local custom avatar system with SVG initials generator
 */

// 1. Hook for the HTML <img> tag (Standard get_avatar calls)
add_filter('pre_get_avatar', 'custom_svg_avatar_html', 10, 3);

// 2. Hook for the raw URL string (get_avatar_url calls)
add_filter('pre_get_avatar_data', 'custom_svg_avatar_url_filter', 10, 2);

/**
 * HOOK 1: Handle HTML output
 * We keep this to ensure we use esc_attr() for Data URIs instead of esc_url()
 */
function custom_svg_avatar_html($avatar, $id_or_email, $args) {
    // 1. Get the URL/Data URI from our central helper
    $url = get_custom_avatar_uri($id_or_email, $args);

    if (!$url) {
        return $avatar; // Fallback to standard if nothing found
    }

    // 2. Build the tag safely (Your existing logic)
    return build_avatar_img($url, $args);
}

/**
 * HOOK 2: Handle URL output
 * This allows get_avatar_url() to return your SVG Data URI or Custom Image URL
 */
function custom_svg_avatar_url_filter($args, $id_or_email) {
    // Avoid infinite loops if needed, though usually safe here
    $url = get_custom_avatar_uri($id_or_email, $args);

    if ($url) {
        $args['url'] = $url;
        // Optimization: prevent WordPress from checking Gravatar since we found a local one
        $args['found_avatar'] = true; 
    }

    return $args;
}

/**
 * CORE LOGIC: Determines the Avatar URI (Image URL or SVG Data URI)
 * Returns string or false.
 */
function get_custom_avatar_uri($id_or_email, $args = []) {
    $user_id = 0;
    $user    = false;

    // 1. Normalize User Detection
    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;
    }

    // 2. Check for Custom Uploaded Image (Meta field: 'custom_avatar')
    if ($user_id > 0) {
        $custom_url = get_user_meta($user_id, 'custom_avatar', true);
        if (!empty($custom_url)) {
            return $custom_url;
        }
    }

    // 3. Fallback: Generate SVG Initials
    $name = '';
    if ($user_id > 0) {
        $user_data = get_userdata($user_id);
        $name = $user_data->display_name;
    } elseif (is_object($id_or_email) && !empty($id_or_email->comment_author)) {
        $name = $id_or_email->comment_author;
    } else {
        $name = is_string($id_or_email) ? $id_or_email : 'Visitor';
    }

    // Generate Initials & Color
    $initials = strtoupper(get_initials_from_name($name));
    $size     = isset($args['size']) ? (int) $args['size'] : 96;
    
    // Consistent Color Hash
    $hash  = md5($name);
    $color = '#' . substr($hash, 0, 6);

    // Generate SVG HTML
    $svg = create_svg_avatar($initials, $color, $size);

    // Return Data URI
    return 'data:image/svg+xml;base64,' . base64_encode($svg);
}

/**
 * Helper: Build the <img> tag safely
 */
function build_avatar_img($src, $args) {
    $size  = isset($args['size'])  ? (int) $args['size']  : 96;
    $alt   = isset($args['alt'])   ? $args['alt'] : '';
    $class = isset($args['class']) ? $args['class'] : 'avatar';
    
    $class_safe = esc_attr($class . ' avatar-' . $size . ' photo');
    
    // CRITICAL: Allow Data URIs by using esc_attr instead of esc_url for them
    if (strpos($src, 'data:image') === 0) {
        $src_safe = esc_attr($src);
    } else {
        $src_safe = esc_url($src);
    }

    return sprintf(
        '<img alt="%s" src="%s" class="%s" height="%d" width="%d" loading="lazy" />',
        esc_attr($alt),
        $src_safe,
        $class_safe,
        $size,
        $size
    );
}

/**
 * Helper: Extract Initials
 */
function get_initials_from_name($name) {
    if (empty($name)) return '?';
    $clean_name = trim(preg_replace('/[0-9@\.]/', '', $name));
    if (empty($clean_name)) $clean_name = $name;

    $parts = preg_split('/\s+/', $clean_name);
    
    if (count($parts) >= 2) {
        return mb_substr($parts[0], 0, 1) . mb_substr($parts[1], 0, 1);
    }
    return mb_substr($name, 0, 1);
}

/**
 * Helper: Generate SVG Code
 */
function create_svg_avatar($initials, $bg_color, $size) {
    $font_size = round($size * 0.45);
    return '
    <svg xmlns="http://www.w3.org/2000/svg" width="'.$size.'" height="'.$size.'" viewBox="0 0 '.$size.' '.$size.'">
      <rect width="100%" height="100%" fill="'.$bg_color.'" />
      <text x="50%" y="50%" dy=".35em" 
            font-size="'.$font_size.'" 
            fill="#ffffff" 
            text-anchor="middle" 
            font-family="sans-serif, Arial" 
            font-weight="bold">
        '.$initials.'
      </text>
    </svg>';
}
×
禁止gravatar设置本地avatar所有代码，如果设置了头像就用头像否则用名字的前两个生成头像字符

禁止gravatar设置本地avatar所有代码，如果设置了头像就用头像否则用名字的前两个生成头像字符

这个只有部分能用，更新版本在下面 /**...
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