inst.
*
* @return bool True if the image has usable measurements, false if not.
*/
private static function has_usable_dimensions( $dimensions, $usable_dimensions ) {
foreach ( [ 'width', 'height' ] as $param ) {
$minimum = $usable_dimensions[ 'min_' . $param ];
$maximum = $usable_dimensions[ 'max_' . $param ];
$current = $dimensions[ $param ];
if ( ( $current < $minimum ) || ( $current > $maximum ) ) {
return false;
}
}
return true;
}
/**
* Gets the post's first usable content image. Null if none is available.
*
* @param int|null $post_id The post id.
*
* @return string|null The image URL.
*/
public static function get_first_usable_content_image_for_post( $post_id = null ) {
$post = get_post( $post_id );
// We know get_post() returns the post or null.
if ( ! $post ) {
return null;
}
$image_finder = new WPSEO_Content_Images();
$images = $image_finder->get_images( $post->ID, $post );
return self::get_first_image( $images );
}
/**
* Gets the term's first usable content image. Null if none is available.
*
* @param int $term_id The term id.
*
* @return string|null The image URL.
*/
public static function get_first_content_image_for_term( $term_id ) {
$term_description = term_description( $term_id );
// We know term_description() returns a string which may be empty.
if ( $term_description === '' ) {
return null;
}
$image_finder = new WPSEO_Content_Images();
$images = $image_finder->get_images_from_content( $term_description );
return self::get_first_image( $images );
}
/**
* Retrieves an attachment ID for an image uploaded in the settings.
*
* Due to self::get_attachment_by_url returning 0 instead of false.
* 0 is also a possibility when no ID is available.
*
* @param string $setting The setting the image is stored in.
*
* @return int|bool The attachment id, or false or 0 if no ID is available.
*/
public static function get_attachment_id_from_settings( $setting ) {
$image_id = WPSEO_Options::get( $setting . '_id', false );
if ( ! $image_id ) {
$image = WPSEO_Options::get( $setting, false );
if ( $image ) {
// There is not an option to put a URL in an image field in the settings anymore, only to upload it through the media manager.
// This means an attachment always exists, so doing this is only needed once.
$image_id = self::get_attachment_by_url( $image );
WPSEO_Options::set( $setting . '_id', $image_id );
}
}
return $image_id;
}
/**
* Retrieves the first possible image url from an array of images.
*
* @param array $images The array to extract image url from.
*
* @return string|null The extracted image url when found, null when not found.
*/
protected static function get_first_image( $images ) {
if ( ! is_array( $images ) ) {
return null;
}
$images = array_filter( $images );
if ( empty( $images ) ) {
return null;
}
return reset( $images );
}
}