FRONTEND_MVC/models/base/BaseFrontendClass.php

<?php

namespace app\models\base;

use yii\db\ActiveRecord;

class BaseFrontendClass extends ActiveRecord
{
    public static function getDb()
    {
        return \Yii::$app->db;
    }

    public function generatePreview( $ifile, $ofile, $w, $h)
    {
		list($width, $height) = getimagesize($ifile);
//		echo "convert -define jpeg:size=".$w."x".$h."+".$x."+".$y." $ifile -crop ".$w."x".$h."+".$x."+".$y." -thumbnail ".$ww."x".$hh."^ -gravity center $ofile";
		umask(0113);
		exec("convert -define jpeg:size=".$width."x".$height."+0+0 $ifile -thumbnail ".$w."x".$h."^ -gravity center -background '#FFFFFF' -quality 95  $ofile" );
		chmod($ofile, 0664);
    }

    public function generateImageCrop( $ifile, $ofile, $ww, $hh, $param )
    {
		// to do add rotate, etc
		extract( $param );
		list($width, $height) = getimagesize($ifile);
		$addp = '';
		if( strrpos($ofile, '.webp') == strlen($ofile) - strlen('.webp') )
		{
			$addp = " -background '#FFFFFF' -alpha off -strip Plane -quality 88 -define webp:method=6 "; //-interlace
		}
		umask(0113);
//		echo "convert -define jpeg:size=".$w."x".$h."+".$x."+".$y." $ifile -crop ".$w."x".$h."+".$x."+".$y." -thumbnail ".$ww."x".$hh."^ -gravity center $ofile";
		exec("convert -define jpeg:size=".$width."x".$height."+0+0 $ifile -crop ".$w."x".$h."+".$x."+".$y." -thumbnail ".$ww."x".$hh."^ $addp -gravity center $ofile" ); //> /dev/null 2>&1 & > /dev/null & в фоне
//		chmod($ofile, 0664);
    }

}