apply_filters( 'wp_get_attachment_url', string $url, int $attachment_id )

Filters the attachment URL.

Contents

Parameters

$url string
URL for the given attachment.
$attachment_id int
Attachment post ID.

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More Information

wp_get_attachment_url() doesn’t distinguish whether a page request arrives via HTTP or HTTPS.

Using wp_get_attachment_url filter, we can fix this to avoid the dreaded mixed content browser warning:

add_filter('wp_get_attachment_url', 'honor_ssl_for_attachments');
function honor_ssl_for_attachments($url) {
	$http = site_url(FALSE, 'http');
	$https = site_url(FALSE, 'https');
	return ( $_SERVER['HTTPS'] == 'on' ) ? str_replace($http, $https, $url) : $url;
}

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Source

File: wp-includes/post.php. View all references 

$url = apply_filters( 'wp_get_attachment_url', $url, $post->ID );

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Changelog

Changelog
Version Description
2.1.0 Introduced.

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User Contributed Notes

  1. Skip to note 1 content
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    Contributed by Collins Mbaka —

    As of WordPress Version 3.2.1, wp_get_attachment_url() doesn’t distinguish whether a page request arrives via HTTP or HTTPS.

    Using wp_get_attachment_url filter, we can fix this to avoid the dreaded mixed content browser warning

    add_filter( 'wp_get_attachment_url', 'wpdocs_honor_ssl_for_attachments' );
function wpdocs_honor_ssl_for_attachments( $url ) {
	$http = site_url( FALSE, 'http' );
	$https = site_url( FALSE, 'https' );
	return ( 'on' === $_SERVER['HTTPS'] ) ? str_replace( $http, $https, $url ) : $url;
}

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