php pdf檔轉圖片

為什麼會檔案讀取不到，路徑 pdf檔權限都已設定

<code>$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;
       }
   }
</code>

報錯內容：Fatal error: Uncaught exception 'ImagickException' with message 'Failed to read the file' in

回覆內容：

為什麼會檔案讀取不到，路徑 pdf檔權限都已設定

<code>$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;
       }
   }
</code>

報錯內容：Fatal error: Uncaught exception 'ImagickException' with message 'Failed to read the file' in

$PDF使用絕對路徑呢

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