imagic librarie中的错误-php

<form action=\"thumb.php\" method=\"post\" enctype=\"multipart/form-data\">
   <p>
      <label for=\"file\">Select a file:</label> 
      <input type=\"file\" name=\"userfile\" id=\"file\"> <br />
      <button>Upload File</button>
   <p>
</form>

<?php

error_reporting(-1);

$imagePath = $_FILES[\"userfile\"];

$thumbnailWidth = 100;
$thumbnailHeight = 100;

$srgbPath = \'thumb/sRGB_v4_ICC_preference.icc\';

$image = new Imagick($imagePath);

$width = $image->getImageWidth();
$height = $image->getImageHeight();

$srgb = file_get_contents($srgbPath);
$image->profileImage(\'icc\', $srgb);

$image->stripImage();

$image->setImageColorspace(Imagick::COLORSPACE_SRGB);

$fitWidth = ($thumbnailWidth / $width) < ($thumbnailHeight / $height);

$image->thumbnailImage(
$fitWidth ? $thumbnailWidth : 0,
$fitWidth ? 0 : $thumbnailHeight
);

$imagePathParts = pathinfo($imagePath);
$thumbnailPath = \"thumb/miniaturas/\".
$imagePathParts[\'filename\'].\'_\'.
$thumbnailWidth.\'x\'.$thumbnailHeight.\'.jpg\';

$image->setImageCompressionQuality(90);

$image->writeImage($thumbnailPath);
echo $image;
$image->clear();
$image->destroy();

?>

$imagePath = $_FILES[\"userfile\"];

$imagePath = \'thumb/main.jpg\';