getimagesize无法使用大图像

Question

此脚本用于缩小图像大小。它仅适用于尺寸小于2MB的图像。当我使用大于此尺寸的图片时，它会在getimagesize中生成错误，错误为getimagesize(): Filename cannot be empty。我不知道为什么它不起作用。我已将内存限制更改为1024 MB，但仍无效。

注意：我使用wamp服务器

 <?PHP
     function imagecrop($img_name,$newname,$type,$modwidth,$modheight)
    {

        list($width, $height) = getimagesize($img_name) ; //get width & height in array list


        $tn = imagecreatetruecolor($modwidth, $modheight); 
        if(!strcmp("image/png",$type))
        {
        imagealphablending($tn, false); //For transparent BackGround
        imagesavealpha($tn, true);  
        }



       if(!strcmp("image/jpg",$type) || !strcmp("image/jpeg",$type) || !strcmp("image/pjpeg",$type))
            $src_img=imagecreatefromjpeg($img_name);

        if(!strcmp("image/png",$type))
            $src_img=imagecreatefrompng($img_name);

        if(!strcmp("image/gif",$type))
            $src_img=imagecreatefromgif($img_name);

              imagecopyresampled($tn, $src_img, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ; 


       if(!strcmp("image/png",$type))  
       {
       imagesavealpha($src_img, true);
       $ok=imagepng($tn,$newname);
       }
       else if(!strcmp("image/gif",$type))  
       {
       $ok=imagegif($tn,$newname);
       }
       else 
       {
       $ok=imagejpeg($tn,$newname);
       }

    if($ok==1)
      {
    return "<img src=".$_FILES['image']['name']." border='0'>";
      }
    } 

    if(isset($_POST['Resize']))
    {
    // imagecrop(Upload Image tmp_path,Upload Image store path,Upload Image type,resize width,resize height);
    echo imagecrop($_FILES['image']['tmp_name'],$_FILES['image']['name'],$_FILES['image']['type'],650,250);
    }
    ?>

HTML：

    <form enctype="multipart/form-data" method="post">
    <table width="100%" border="0" cellspacing="0" cellpadding="0">
      <tr>
        <td width="10%">Upload Image : </td>
        <td width="24%">
          <input type="file" name="image" />    </td>
        <td width="66%"><input type="submit" name="Resize" value="Submit" /></td>
      </tr>
    </table>
    </form>