elgg How to get the file icon address_PHP tutorial

The process is as follows:
First, use this method (system itself) when saving the entity:
For example, there is an Activity class, which inherits from ElggObject and creates an instance activity of it,

Copy code The code is as follows:

// Now see if we have a file icon
if ((isset($_FILES['icon']) ) && (substr_count($_FILES['icon']['type'],'image/'))) {
$prefix = "activity/".$activity->guid;
$filehandler = new ElggFile();
$filehandler->owner_guid = $activity->owner_guid;
$filehandler->setFilename($prefix . ".jpg");
$filehandler->open ("write");
$filehandler->write(get_uploaded_file('icon'));
$filehandler->close();
$thumbtiny = get_resized_image_from_existing_file($filehandler->getFilenameOnFilestore (),25,25, true);
$thumbsmall = get_resized_image_from_existing_file($filehandler->getFilenameOnFilestore(),40,40, true);
$thumbmedium = get_resized_image_from_existing_file($filehandler->getFilenameOnFilestore() ,100,100, true);
$thumblarge = get_resized_image_from_existing_file($filehandler->getFilenameOnFilestore(),200,200, false);
if ($thumbtiny) {
$thumb = new ElggFile();
$thumb->owner_guid = $activity->owner_guid;
$thumb->setMimeType('image/jpeg');
$thumb->setFilename($prefix."tiny.jpg" );
$thumb->open("write");
$thumb->write($thumbtiny);
$thumb->close();
$thumb-> ;setFilename($prefix."small.jpg");
$thumb->open("write");
$thumb->write($thumbsmall);
$thumb-> close();
$thumb->setFilename($prefix."medium.jpg");
$thumb->open("write");
$thumb->write($ thumbmedium);
$thumb->close();
$thumb->setFilename($prefix."large.jpg");
$thumb->open("write");
$thumb->write($thumblarge);
$thumb->close();
}
}

After this process, the file will be Save it to a directory structure composed of username strings. For example, if the username is abc, it will be saved under a/b/c/, and then a file name will be composed of the guid+size+.jpg of the picture.
When obtaining the src address, obtain it through the entity->getIcon(); method. getIcon is a method in entities.php. Then this method will call the get_entity_icon_url method. There is a line in the get_entity_icon_url method:
$url = trigger_plugin_hook('entity:icon:url', $entity->getType(), array('entity' => $entity , 'viewtype' => $viewtype, 'size' => $size), $url);
It will trigger a hook, which needs to be registered in the plug-in's start.php. Write this when registering:
register_plugin_hook('entity:icon:url', 'object', 'activity_activityicon_hook');
The first parameter is the hook type, and the second is the entity type, which is the type of activity , the third one is the hook function name.
Then write the activity_activityicon_hook method in start.php:

Copy the code The code is as follows:

/**
* Get Icon
* This hooks into the getIcon API and provides nice user icons for users where possible.
*
* @param string $hook hook name
* @param string $entity_type Entity type
* @param string $returnvalue Image url address
* @param unknow $params Parameter table column
* @return string $url Image url address
*/
function activity_activityicon_hook($hook, $entity_type, $returnvalue, $params) {
global $CONFIG;
if ((!$returnvalue) && ($hook == 'entity:icon :url') && ($params['entity'] instanceof Activity)) {
$entity = $params['entity'];
$type = $entity->type;
$viewtype = $params['viewtype'];
$size = $params['size'];
if ($icontime = $entity->icontime) {
$icontime = "{$icontime} ";
} else {
$icontime = "default";
}
$filehandler = new ElggFile();
$filehandler->owner_guid = $entity->owner_guid;
$filehandler->setFilename("activity/" . $entity->guid . $size . ".jpg");
if ($filehandler->exists()) {
$ url = $CONFIG->url . "pg/activityicon/{$entity->guid}/$size/$icontime.jpg";
return $url;
}
}
}

This method will return a url, which is the address of src. After the url returns to get_entity_icon_url, it will continue to be processed according to the image size and the final url will be returned. In this way, the src address is obtained.

http://www.bkjia.com/PHPjc/321496.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/321496.htmlTechArticleThe process is as follows: First, use this method (system itself) when saving entities: For example, there is an Activity class, Inherited from ElggObject, created an instance activity of it, copy the code...