How do I get the size of an attachment file?

I’m using the following template code to display attachment links:

$args = array(
    'post_type' => 'attachment',
    'numberposts' => -1,
    'post_status' => null,
    'post_parent' => $main_post_id
);

$attachments = get_posts($args);

foreach ($attachments as $attachment)
{
    the_attachment_link($attachment->ID, false);
}

but after the link I need to display the file’s size. How can I do this?

I’m guessing I could determine the file’s path (via wp_upload_dir() and a substr() of wp_get_attachment_url()) and call filesize() but that seems messy, and I’m just wondering if there’s a method built into WordPress.

Answers:

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Method 1

As far as I know, WordPress has nothing built in for this, I would just do:

filesize( get_attached_file( $attachment->ID ) );

Method 2

I would do :

$attachment_filesize = filesize( get_attached_file( $attachment_id ) );

Or with readable size like 423.82 KB

$attachment_filesize = size_format( filesize( get_attached_file( $attachment_id ) ), 2 );

Refs :
get_attached_file(),
filesize(),
size_format()

Note : Define your $attachment_id

Method 3

I have used this before in functions.php to display the file size in an easily readable format:

function getSize($file){
$bytes = filesize($file);
$s = array('b', 'Kb', 'Mb', 'Gb');
$e = floor(log($bytes)/log(1024));
return sprintf('%.2f '.$s[$e], ($bytes/pow(1024, floor($e))));}

And then in my template:

echo getSize('insert reference to file here');

Method 4

There’s an easier solution, to get human readable file sizes.

$attachment_id  = $attachment->ID;
$attachment_meta = wp_prepare_attachment_for_js($attachment_id);

echo $attachment_meta['filesizeHumanReadable'];

Method 5

To find the size of a file added through the custom fields plugin, I did this:

$fileObject = get_field( 'file ');
$fileSize   = size_format( filesize( get_attached_file( $fileObject['id'] ) ) );

Just make sure you set the custom field’s “Return Value” to “File Object”.

Method 6

I was looking for the same and found this WordPress built-in solution.

$args = array(
    'post_type' => 'attachment',
    'numberposts' => -1,
    'post_status' => null,
    'post_parent' => $main_post_id
);

$attachments = get_posts($args);

foreach ($attachments as $attachment)
{
    $attachment_id = $attachment->ID;
    $image_metadata = wp_get_attachment_metadata( $attachment_id );
    the_attachment_link($attachment->ID, false);
    echo the_attachment_link['width'];
    echo the_attachment_link['height'];
}

See more at wp_get_attachment_metadata()

Method 7

For audio at least, the file size is saved as “metadata”.

$metadata = wp_get_attachment_metadata( $attachment_id );
echo $metadata['filesize'];

This may not be the case for images and video.

Method 8

Get image file size in wordpress:

$query_images_args = array(
    'post_type' => 'attachment',
    'post_mime_type' => 'image',
    'post_status' => 'inherit',
    'posts_per_page' => 10,
);

$query_images = new WP_Query($query_images_args);

foreach ($query_images->posts as $image) {
    $img_atts = wp_get_attachment_image_src($image->ID, $default);
    $img = get_headers($img_atts[0], 1);
    $size = $img["Content-Length"]/1024;
    echo round($size);

}

Method 9

Simple function to get attachment file size by attachment id, similar to another answer here but with a little error checking. There is also an additional parameter to specify the number of decimal points to return:

function tm_get_attachment_size($attachment_id, $decimals) {
    $file = get_attached_file( $attachment_id );
    return $file ? size_format( filesize($file), $decimals ) : 0;
}

For example, say I have an attachment ID of 99: tm_get_attachment_size(99, 1) would return ‘1.4 MB’.

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0