图片上传
1. 准备工作
2. 创建HTML表单
<form action="upload.php" method="post" enctype="multipart/form-data">
<input type="file" name="image" />
<input type="submit" value="上传" />
</form>
3. PHP脚本处理
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
if (isset($_FILES["image"])) {
$image = $_FILES["image"];
$upload_dir = "uploads/";
$filename = basename($image["name"]);
$filetemp = $image["tmp_name"];
$filetype = $image["type"];
$filesize = $image["size"];
$allowed = array("jpg", "jpeg", "png", "gif");
$ext = strtolower(end(explode('.', $filename)));
if (in_array($ext, $allowed)) {
if ($filesize < 2000000) {
if (move_uploaded_file($filetemp, $upload_dir . $filename)) {
echo "文件上传成功: " . $filename;
} else {
echo "文件上传失败";
}
} else {
echo "文件大小超过2MB";
}
} else {
echo "不支持的文件格式";
}
}
}
?>
4. 保存上传的图片
图片截取
1. 使用GD库
确保你的PHP安装了GD库。
2. 截取图片
<?php
$image = imagecreatefromjpeg("uploads/image.jpg");
$x = 50; // 截取的起始X坐标
$y = 50; // 截取的起始Y坐标
$width = 100; // 截取的宽度
$height = 100; // 截取的高度
$cut_image = imagecrop($image, ['x' => $x, 'y' => $y, 'width' => $width, 'height' => $height]);
imagejpeg($cut_image, "uploads/cut_image.jpg");
?>