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get_resource_preview()

Description

Get the largest available preview URL for the given resource and the given array of sizes

Parameters

ColumnTypeDefaultDescription
$resource array Array of resource data from get_resource_data() or search results
$sizes array [] Array of size IDs to look through, in order of size. If not provied will use all sizes
$access int -1 Resource access
$watermark bool false Look for watermarked versions?
$page int 1 Page to look for

Return

string | bool URL, or false if no image is found

Location

include/resource_functions.php lines 9521 to 9609

Definition

 
function get_resource_preview(array $resource,array $sizes = [], int $access = -1, bool $watermark = false, int $page = 1)
    {
    global $userref, $open_access_for_contributor;
    if(empty($sizes))
        {
        $sizes = array_reverse(array_column(get_all_image_sizes(),"id"));
        }

    $preview["url"] = "";
    if (isset($resource['thm_url']))
        {
        // Option to override thumbnail image in search results, e.g. by plugin using process_search_results hook
        $preview["url"] = $resource['thm_url'];
        $preview["height"] = $resource["thumb_height"];
        $preview["width"] = $resource["thumb_width"];
        }
    else
        {
        if((int)$resource['has_image'] !== RESOURCE_PREVIEWS_NONE)
            {
            // If configured, try and use a preview from a related resource
            $pullresource = related_resource_pull($resource);
            if($pullresource !== false)
                {
                $resource = $pullresource;
                }
            }

        if($access == -1)
            {
            $access = get_resource_access($resource);
            }

        // Work out image to use.
        if($watermark !== '')
            {
            $use_watermark = check_use_watermark();
            }
        else
            {
            $use_watermark = false;
            }
        $validimage = false;
        foreach($sizes as $size)
            {
            if(resource_has_access_denied_by_RT_size($resource['resource_type'], $size)
               && !($open_access_for_contributor && $userref == $resource['created_by']) )
                {
                continue;
                }

            // Check that file actually exists
            $img_file = get_resource_path(
                $resource['ref'],
                true,
                $size,
                false,
                $resource['preview_extension'],
                true,
                $page,
                $use_watermark,
                $resource['file_modified']
            );
            if(file_exists($img_file))
                {
                $preview["path"] = $img_file;
                $preview["url"] = get_resource_path($resource['ref'],false,$size ,false,$resource['preview_extension'],true,$page,$use_watermark,$resource['file_modified']);
                $GLOBALS["use_error_exception"] = true;
                try
                    {
                    list($preview["width"], $preview["height"]) = getimagesize($img_file);
                    $validimage = true;
                    }
                catch (Exception $e)
                    {
                    $returned_error = $e->getMessage();
                    debug("get_resource_preview - getimagesize(): " . $returned_error);
                    }
                unset($GLOBALS["use_error_exception"]);
                break;
                }
            }
        }
    if(!$validimage)
        {
        return false;
        }
    return $preview;
    }

This article was last updated 17th November 2024 15:35 Europe/London time based on the source file dated 15th November 2024 18:30 Europe/London time.