WordPress免插件远程（外链）图片自动本地化

将这段代码添加到 word­press 主题 func­tions.php 文件里就可以了。

//自动本地化外链图片
add_filter('content_save_pre', 'auto_save_image');
function auto_save_image($content) {
$upload_path = '';
$upload_url_path = get_bloginfo('url');
//上传目录
if (($var = get_option('upload_path')) != '') {
    $upload_path = $var;
} else {
    $upload_path = 'wp-content/uploads';
}
if (get_option('uploads_use_yearmonth_folders')) {
    $upload_path.= '/' . date("Y", time()) . '/' . date("m", time());
}
//文件地址
if (($var = get_option('upload_url_path')) != '') {
    $upload_url_path = $var;
} else {
    $upload_url_path = get_bloginfo('url');
}
if (get_option('uploads_use_yearmonth_folders')) {
    $upload_url_path.= '/wp-content/uploads/' . date("Y", time()) . '/' . date("m", time());
}
require_once ("../wp-includes/class-snoopy.php");
$snoopy_Auto_Save_Image = new Snoopy;
$img = array();
//以文章的标题作为图片的标题
if (!empty($_REQUEST['post_title'])) $post_title =
wp_specialchars(stripslashes($_REQUEST['post_title']));
$text = stripslashes($content);
if (get_magic_quotes_gpc()) $text = stripslashes($text);
preg_match_all("/ src=(\"|\'){0,}(http:\/\/(.+?))(\"|\'|\s)/is", $text, $img);
$img = array_unique(dhtmlspecialchars($img[2]));
foreach ($img as $key => $value) {
    set_time_limit(180); //每个图片最长允许下载时间,秒
    if (str_replace(get_bloginfo('url'), "", $value) == $value && str_replace(get_bloginfo('home'),
"", $value) == $value) {
        //判断是否是本地图片，如果不是，则保存到服务器
        $fileext = substr(strrchr($value, '.'), 1);
        $fileext = strtolower($fileext);
        if ($fileext == "" || strlen($fileext) > 4) $fileext = "jpg";
        $savefiletype = array('jpg', 'gif', 'png', 'bmp');
        if (in_array($fileext, $savefiletype)) {
            if ($snoopy_Auto_Save_Image->fetch($value)) {
                $get_file = $snoopy_Auto_Save_Image->results;
            } else {
                echo "error fetching file: " . $snoopy_Auto_Save_Image->error . "<br>";
                echo "error url: " . $value;
                die();
            }
            $filetime = time();
            $filepath = "/" . $upload_path; //图片保存的路径目录
            !is_dir(".." . $filepath) ? mkdirs(".." . $filepath) : null;
            //$filename = date("His",$filetime).random(3);
            $filename = substr($value, strrpos($value, '/'), strrpos($value, '.') - strrpos($value, '/'));
            //$e = '../'.$filepath.$filename.'.'.$fileext;
            //if(!is_file($e)) {
            // copy(htmlspecialchars_decode($value),$e);
            //}
            $fp = @fopen(".." . $filepath . $filename . "." . $fileext, "w");
            @fwrite($fp, $get_file);
            fclose($fp);
            $wp_filetype = wp_check_filetype($filename . "." . $fileext, false);
            $type = $wp_filetype['type'];
            $post_id = (int)$_POST['temp_ID2'];
            $title = $post_title;
            $url = $upload_url_path . $filename . "." . $fileext;
            $file = $_SERVER['DOCUMENT_ROOT'] . $filepath . $filename . "." . $fileext;
            //添加数据库记录
            $attachment = array('post_type' => 'attachment', 'post_mime_type' => $type, 'guid' => $url, 'post_parent' => $post_id, 'post_title' => $title, 'post_content' => '',);
            $id = wp_insert_attachment($attachment, $file, $post_parent);
            $text = str_replace($value, $url, $text); //替换文章里面的图片地址

        }
    }
}
$content = AddSlashes($text);
remove_filter('content_save_pre', 'auto_save_image');
return $content;
}
function mkdirs($dir) {
if (!is_dir($dir)) {
    mkdirs(dirname($dir));
    mkdir($dir);
}
return;
}
function dhtmlspecialchars($string) {
if (is_array($string)) {
    foreach ($string as $key => $val) {
        $string[$key] = dhtmlspecialchars($val);
    }
} else {
    $string = str_replace('&', '&', $string);
    $string = str_replace('"', '"', $string);
    $string = str_replace('<', '<', $string);
    $string = str_replace('>', '>', $string);
    $string = preg_replace('/&(#\d;)/', '&\1', $string);
}
return $string;
}

以后你发表文章时就不用去管文章中的外链图片了，因为上面的代码会自动将文章中包含的外链图片自动保存到本地