PHP PDF file to image

Why the file cannot be read, the path PDF file permissions are set

$PDF = './22.pdf';$IM =new imagick();   $IM->setResolution(120,120);   $IM->setCompressionQuality(100);   $IM->readImage($PDF);   foreach($IM as $Key => $Var){       $Var->setImageFormat('png');       $Filename = './'.md5($Key.time()).'.png';       if($Var->writeImage($Filename)==true){           $Return[]= $Filename;       }   }

Error content: Fatal error:uncaught exception ' imagickexception ' with message ' Failed to read the file ' in

Reply content:

Why the file cannot be read, the path PDF file permissions are set

$PDF = './22.pdf';$IM =new imagick();   $IM->setResolution(120,120);   $IM->setCompressionQuality(100);   $IM->readImage($PDF);   foreach($IM as $Key => $Var){       $Var->setImageFormat('png');       $Filename = './'.md5($Key.time()).'.png';       if($Var->writeImage($Filename)==true){           $Return[]= $Filename;       }   }

Error content: Fatal error:uncaught exception ' imagickexception ' with message ' Failed to read the file ' in

$PDF Use absolute paths?

try {    // read img}  catch (ImagickException $e) {    echo  exception;}

