php 图片管理

<?php
if ($_FILES['file']['error'] == UPLOAD_ERR_OK) {
    $upload_dir = 'uploads/';
    if (!file_exists($upload_dir)) {
        mkdir($upload_dir, 0777, true);
    }
    $file_path = $upload_dir . basename($_FILES['file']['name']);
    if (move_uploaded_file($_FILES['file']['tmp_name'], $file_path)) {
        echo "文件上传成功";
    } else {
        echo "文件上传失败";
    }
} else {
    echo "上传错误：" . $_FILES['file']['error'];
}
?>

<?php
$image = new Imagick('input.jpg');
$image->resizeImage(800, 600, Imagick::FILTER_LANCZOS, 1);
$image->writeImage('output.jpg');
?>

<?php
$image_path = 'uploads/example.jpg';
if (file_exists($image_path)) {
    header('Content-Type: image/jpeg');
    readfile($image_path);
} else {
    echo "图片不存在";
}
?>