DB query in Wordpress snippet not working [duplicate] - php

Question

I know the path of the file and I like to get the attachment ID.
There's a function wp_get_attachment_url() which requires the ID to get the URL but I need it reverse (with path not URL though)

Answer 1

UPDATE: since wp 4.0.0 there's a new function that could do the job. I didn't tested it yet, but it's this:
https://developer.wordpress.org/reference/functions/attachment_url_to_postid/
OLD ANSWER: so far, the best solution I've found out there, is the following:
https://frankiejarrett.com/2013/05/get-an-attachment-id-by-url-in-wordpress/
I think It's the best for 2 reasons:
It does some integrity checks
[important!] it's domain-agnostic. This makes for safe site moving. To me, this is a key feature.

Answer 2

I used this cool snipped by pippinsplugins.com
Add this function in your functions.php file
// retrieves the attachment ID from the file URL
function pippin_get_image_id($image_url) {
global $wpdb;
$attachment = $wpdb->get_col($wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE guid='%s';", $image_url ));
return $attachment[0];
}
Then use this code in your page or template to store / print / use the ID:
// set the image url
$image_url = 'http://yoursite.com/wp-content/uploads/2011/02/14/image_name.jpg';
// store the image ID in a var
$image_id = pippin_get_image_id($image_url);
// print the id
echo $image_id;
Original post here: https://pippinsplugins.com/retrieve-attachment-id-from-image-url/
Hope ti helps ;)
Francesco

Answer 3

Try attachment_url_to_postid function.
$rm_image_id = attachment_url_to_postid( 'http://example.com/wp-content/uploads/2016/05/castle-old.jpg' );
echo $rm_image_id;
More details

Answer 4

None of the other answers here appear to work properly or reliably for a file path. The answer using Pippin's function also is flawed, and doesn't really do things "the WordPress Way".
This function will support either a path OR a url, and relies on the built-in WordPress function attachment_url_to_postid to do the final processing properly:
/**
* Find the post ID for a file PATH or URL
*
* #param string $path
*
* #return int
*/
function find_post_id_from_path( $path ) {
// detect if is a media resize, and strip resize portion of file name
if ( preg_match( '/(-\d{1,4}x\d{1,4})\.(jpg|jpeg|png|gif)$/i', $path, $matches ) ) {
$path = str_ireplace( $matches[1], '', $path );
}
// process and include the year / month folders so WP function below finds properly
if ( preg_match( '/uploads\/(\d{1,4}\/)?(\d{1,2}\/)?(.+)$/i', $path, $matches ) ) {
unset( $matches[0] );
$path = implode( '', $matches );
}
// at this point, $path contains the year/month/file name (without resize info)
// call WP native function to find post ID properly
return attachment_url_to_postid( $path );
}

Answer 5

Cropped URLs
None of the previous answers supported ID lookup on attachment URLs that contain a crop.
e.g: /uploads/2018/02/my-image-300x250.jpg v.s. /uploads/2018/02/my-image.jpg
Solution
Micah at WP Scholar wrote a blog post and uploaded the code to this Gist. It handles both original and cropped URL lookup.
I included the code below as a reference but, if you find useful, I'd encourage you to leave a comment on his post or star the gist.
/**
* Get an attachment ID given a URL.
*
* #param string $url
*
* #return int Attachment ID on success, 0 on failure
*/
function get_attachment_id( $url ) {
$attachment_id = 0;
$dir = wp_upload_dir();
if ( false !== strpos( $url, $dir['baseurl'] . '/' ) ) { // Is URL in uploads directory?
$file = basename( $url );
$query_args = array(
'post_type' => 'attachment',
'post_status' => 'inherit',
'fields' => 'ids',
'meta_query' => array(
array(
'value' => $file,
'compare' => 'LIKE',
'key' => '_wp_attachment_metadata',
),
)
);
$query = new WP_Query( $query_args );
if ( $query->have_posts() ) {
foreach ( $query->posts as $post_id ) {
$meta = wp_get_attachment_metadata( $post_id );
$original_file = basename( $meta['file'] );
$cropped_image_files = wp_list_pluck( $meta['sizes'], 'file' );
if ( $original_file === $file || in_array( $file, $cropped_image_files ) ) {
$attachment_id = $post_id;
break;
}
}
}
}
return $attachment_id;
}
Another pro with this solution is that we leverage the WP_Query class instead of making a direct SQL query to DB.

Answer 6

Find IDs for resized images, PDFs and more
Like GFargo pointed out, most of the answers assume the attachment is an image. Also attachment_url_to_postid assumes a url (not a file path).
I believe this better answers the actual question when supplied a file (with path):
function getAttachmentIDFromFile($filepath)
{
$file = basename($filepath);
$query_args = array(
'post_status' => 'any',
'post_type' => 'attachment',
'fields' => 'ids',
'meta_query' => array(
array(
'value' => $file,
'compare' => 'LIKE',
),
)
);
$query = new WP_Query($query_args);
if ($query->have_posts()) {
return $query->posts[0]; //assume the first is correct; or process further if you need
}
return 0;
}

Answer 7

Based on the answer from #FrancescoCarlucci I could do some improvements.
Sometimes, for example when you edit an image in WordPress, it creates a copy from the original and adds the copys upload path as post meta (key _wp_attached_file) which is not respected by the answer.
Here the refined query that includes these edits:
function jfw_get_image_id($file_url) {
$file_path = ltrim(str_replace(wp_upload_dir()['baseurl'], '', $file_url), '/');
global $wpdb;
$statement = $wpdb->prepare("SELECT `ID` FROM `wp_posts` AS posts JOIN `wp_postmeta` AS meta on meta.`post_id`=posts.`ID` WHERE posts.`guid`='%s' OR (meta.`meta_key`='_wp_attached_file' AND meta.`meta_value` LIKE '%%%s');",
$file_url,
$file_path);
$attachment = $wpdb->get_col($statement);
if (count($attachment) < 1) {
return false;
}
return $attachment[0];
}