common/behaviors/ShowImage.php

<?php
namespace common\behaviors;
use yii;
use yii\base\Behavior;
class ShowImage extends Behavior
{
    function minImg($dir, $width, $height=null){
        if(empty($dir)){
            return '/images/avatar-bg.png';
        }
        if($width=='original'){
            $preg = '/\/(.[^\/]*)$/';
            preg_match('/\.(.[^.]*)$/', $dir, $type);
            if(isset($type[1])){
                $dir = preg_replace( $preg, '/original.'.$type[1],  $dir);
            }
        } else {
            $preg = '/\/(.[^\/]*)$/';
            preg_match('/\.(.[^.]*)$/', $dir, $type);
            if(isset($type[1])){
                $dir =  preg_replace( $preg, '/'.$width.'x'.$height.'.'.$type[1],  $dir);
            }
        }
        
        return $dir;
    }
    function ShowGallery($array){
        $gallery = explode(',', $array );
        if(is_array($gallery)){
            array_splice($gallery,-1);
            return $gallery;
        } else {
            return [];
        }
    }
}