PHP开发的商城商品图片管理系统实现探讨

<form action="upload.php" method="post" enctype="multipart/form-data">
  <input type="file" name="image">
  <input type="submit" value="上传图片">
</form>

<?php
if ($_FILES["image"]["error"] > 0) {
  echo "错误：" . $_FILES["image"]["error"];
} else {
  move_uploaded_file($_FILES["image"]["tmp_name"], "uploads/" . $_FILES["image"]["name"]);
  echo "上传成功！";
}
?>

function compressImage($sourcePath, $targetPath, $quality) {
  $imageInfo = getimagesize($sourcePath);
  $imageType = $imageInfo[2];
  
  if ($imageType == IMAGETYPE_JPEG || $imageType == IMAGETYPE_JPEG2000) {
    $image = imagecreatefromjpeg($sourcePath);
    imagejpeg($image, $targetPath, $quality);
  } elseif ($imageType == IMAGETYPE_PNG) {
    $image = imagecreatefrompng($sourcePath);
    imagepng($image, $targetPath, $quality);
  } elseif ($imageType == IMAGETYPE_GIF) {
    $image = imagecreatefromgif($sourcePath);
    imagegif($image, $targetPath, $quality);
  }
  
  imagedestroy($image);
}

$keyword = $_GET["keyword"];

$sql = "SELECT * FROM products WHERE name LIKE '%$keyword%'";
$result = mysqli_query($conn, $sql);

while ($row = mysqli_fetch_assoc($result)) {
  echo "<div class='product'>"
       . "<img src='" . $row["image"] . "' alt='" . $row["name"] . "'>"
       . "<h2>" . $row["name"] . "</h2>"
       . "<p>" . $row["description"] . "</p>"
       . "</div>";
}

function addWatermark($sourcePath, $targetPath, $text) {
  $image = imagecreatefromjpeg($sourcePath);
  $color = imagecolorallocate($image, 255, 255, 255); // 水印文字颜色
  $font = "font.ttf"; // TrueType字体文件路径和文件名
  
  imagettftext($image, 14, 0, 10, 20, $color, $font, $text);
  imagejpeg($image, $targetPath);
  
  imagedestroy($image);
}

$directory = "uploads/";

if (is_dir($directory)) {
  $files = scandir($directory);

  foreach ($files as $file) {
    if ($file != "." && $file != "..") {
      unlink($directory . $file);
    }
  }
}

echo "删除成功！";