How to Automatically Download and Localize External Images in WordPress Posts: functions files

How to Automatically Download and Localize External Images in WordPress Posts: functions files

   December 30, 2024       Ari SEO

---

Write a WordPress image localization function. This function will automatically download external images to the media library when publishing or updating articles.

 <? php
//functions.php

/**
Download external images to your local media library
*/
Function download_external_images ($post_id) {
//Get the content of the article
$Post = get_post ($post_id);
$Content = $post- > post_content;

If the content is empty, return
If (empty ($content)) {
Return;
}

Match all image tags
$Pattern = '/< img [^ >] + src =[\'"]([^\'"]+)[\'"][^>]*>/ i';
preg_match_all ($pattern, $content, $matches);

If (empty ($matches [1])) {
Return;
}

//Get the site URL
$site_url = get_site_url ();
$updated = false;

Foreach ($matches [1] as $image_url) {
//Skip the pictures on this site
If (strpos ($image_url, $site_url)! == false) {
Continue;
}

//download the picture
$Tmp = download_url ($image_url);
If (is_wp_error ($tmp)) {
Continue;
}

//Get file information
$file_array = array (
'Name '= > basename ($image_url),
'tmp_name '= > $tmp
);

//Check the file type
$file_type = wp_check_filetype ($file_array ['name']);
If (! $file_type ['type']) {
Unlink ($tmp);
Continue;
}

//Add the image to the media library
$attachment_id = media_handle_sideload ($file_array, $post_id);

If (is_wp_error ($attachment_id)) {
Unlink ($tmp);
Continue;
}

//Get a new image URL
$new_url = wp_get_attachment_url ($attachment_id);

//Replace the image URL in the content
$Content = str_replace ($image_url, $new_url, $content);
$updated = true;
}

//If there is an update, save the article content
IF ($updated) {
wp_update_post (array (
'ID '= > $post_id,
'post_content '= > $content
));
}
}

//Add a hook to trigger when saving the article
add_action ('save_post', 'download_external_images', 10,1);

/**
* Add image failed to download error handling
*/
Function handle_download_error ($error_msg, $error_code, $error_data, $file) {
error_log ("Image download failed : " . $ error_msg);
Return new WP_Error ($error_code, $error_msg, $error_data);
}
add_filter ('wp_handle_upload_error', 'handle_download_error', 10,4);

Main function description: