WordPress纯代码实现外链图片自动本地化代码

简介:

在WordPress主题中加入远程图片文件自动本地化代码，经常转载文章的朋友应该会用到这个功能。把外链图片自动保存到网站本地，防止外链图片失效造成图片不显示。那么如何实现WordPress远程图片自动本地化？把下面的代码添加到主题的 functions.php 文件里面，以后每当在 wordpress 发布文章时如果文章中含有外链图片就会自动本地化了，无需任何设置操作非常方便。

添加如下代码：

function ecp_save_post($post_id, $post) {

global $wpdb;

if($post->post_status == 'publish') {

$p   = '/<img.[\s]src=[\"|\'](.)[\"|\'].*>/iU';

$num = preg_match_all($p, $post->post_content, $matches);

if ($num) {

$wp_upload_dir = wp_upload_dir();

set_time_limit(0);

$ch = curl_init();

curl_setopt($ch, CURLOPT_HEADER, false);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

curl_setopt($ch, CURLOPT_MAXREDIRS,20);

curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);

        $ecp_options = $_SERVER['HTTP_HOST'];
        foreach ($matches[1] as $src) {
            if (isset($src) && strpos($src, $ecp_options) === false) {
                $file_info = wp_check_filetype(basename($src), null);
                if ($file_info['ext'] == false) {
                    date_default_timezone_set('PRC');
                    $file_name = date('YmdHis-').dechex(mt_rand(100000, 999999)).'.tmp';
                } else {
                    $file_name = dechex(mt_rand(100000, 999999)) . '-' . basename($src);
                }
                curl_setopt($ch, CURLOPT_URL, $src);
                $file_path = $wp_upload_dir['path'] . '/' . $file_name;
                $img = fopen($file_path, 'wb');
                curl_setopt($ch, CURLOPT_FILE, $img);
                $img_data  = curl_exec($ch);
                fclose($img);

                if (file_exists($file_path) && filesize($file_path) > 0) {
                    $t   = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
                    $arr = explode('/', $t);
                    if (pathinfo($file_path, PATHINFO_EXTENSION) == 'tmp') {
                        $file_path = ecp_handle_ext($file_path, $arr[1], $wp_upload_dir['path'], $file_name, 'tmp');
                    } elseif (pathinfo($file_path, PATHINFO_EXTENSION) == 'webp') {
                        $file_path = ecp_handle_ext($file_path, $arr[1], $wp_upload_dir['path'], $file_name, 'webp');
                    }
                    $post->post_content  = str_replace($src, $wp_upload_dir['url'] . '/' . basename($file_path), $post->post_content);
                    $attachment = ecp_get_attachment_post(basename($file_path), $wp_upload_dir['url'] . '/' . basename($file_path));
                    $attach_id = wp_insert_attachment($attachment, ltrim($wp_upload_dir['subdir'] . '/' . basename($file_path), '/'), 0);
                    $attach_data = wp_generate_attachment_metadata($attach_id, $file_path);
                    $ss = wp_update_attachment_metadata($attach_id, $attach_data);
                }
            }
        }
        curl_close($ch);
        $wpdb->update( $wpdb->posts, array('post_content' => $post->post_content), array('ID' => $post->ID));
    }
}
}
function ecp_handle_ext($file, $type, $file_dir, $file_name, $ext) {

switch ($ext) {

case 'tmp':

if (rename($file, str_replace('tmp', $type, $file))) {

if ('webp' == $type) {

return ecp_image_convert('webp', 'jpeg', $file_dir . '/' . str_replace('tmp', $type, $file_name));

}

return $file_dir . '/' . str_replace('tmp', $type, $file_name);

}

case 'webp':

if ('webp' == $type) {

return ecp_image_convert('webp', 'jpeg', $file);

} else {

if (rename($file, str_replace('webp', $type, $file))) {

return $file_dir . '/' . str_replace('webp', $type, $file_name);

}

}

default:

return $file;

}

}
function ecp_image_convert($from='webp', $to='jpeg', $image) {

$im = imagecreatefromwebp($image);

if (imagejpeg($im, str_replace('webp', 'jpeg', $image), 100)) {

try {

unlink($image);

} catch (Exception $e) {

$error_msg = sprintf('Error removing local file %s: %s', $image,

$e->getMessage());

error_log($error_msg);

}

}

imagedestroy($im);
return str_replace('webp', 'jpeg', $image);
}
function ecp_get_attachment_post($filename, $url) {

$file_info  = wp_check_filetype($filename, null);

return array(

'guid'           => $url,

'post_type'      => 'attachement',

'post_mime_type' => $file_info['type'],

'post_title'     => preg_replace('/.[^.]+$/', '', $filename),

'post_content'   => '',

'post_status'    => 'inherit'

);

}

add_action('save_post', 'ecp_save_post', 120, 2);
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