在PHP表单中创建缩略图时出现问题

Question

我很难让脚本的这一部分创建缩略图，缩略图文件夹上有0777，但代码不会创建缩略图，有什么建议吗？

if (isset($_FILES['user_photo']) && !empty($_FILES['user_photo']['name'])) {
$upload_dir ="images";
$thum_dir= "thumbnails";
$img =   $_FILES["user_photo"]["name"];  
//$temp = explode(".", $_FILES["user_photo"]["name"]);
//$file_name = $temp[0].'_'.time();
//$file_ext = $temp[1];
//$img = $file_name . '.' . $file_ext;

$orgfile = $_FILES["user_photo"]["tmp_name"];
list($width,$height)= getimagesize($orgfile);
$newfile = imagecreatefromjpeg($orgfile);
$newwidth = "150";
$newheight = "100";
$thum = $_FILES["user_photo"]["name"];
$truecolor = imagecreatetruecolor($newwidth, $newheight);
imagecopyresampled($truecolor, $newfile, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
imagejpeg($truecolor,$thum,100);
copy($_FILES['user_photo']['tmp_name'], "$upload_dir/$img");
copy($_FILES['user_photo']['name'], "$thum_dir/$thum");
}

Answer 1

对于一个可管理的图像上传系统，我强烈建议使用MYSQL来帮助节省服务器上的空间，并使选择和显示图像变得更容易。

要做到这一点，您需要创建一个MYSQL表，其中包含一个id(主，自动递增键(，然后为user、image和thumb添加3列，将它们设置为null Yes，将Collation设置为utf8_general_ci。

现在创建用于访问数据库和表的用户凭据。我不打算谈那个部分。

最后为图像创建2个文件夹。在这个例子中，这两个文件夹被称为"文件夹"；图像"；以及"；拇指"；。两个文件夹的权限都应设置为755。

<?php
if (isset($_FILES['user_photo'])) {
// Your MYSQL connection file
require_once ('db.php');
// Thumbnail maker function to be called later - do not alter this
function make_thumb($src, $dest, $desired_width) {
$source_image = imagecreatefromjpeg($src);
$width = imagesx($source_image);
$height = imagesy($source_image);
$desired_height = floor($height * ($desired_width / $width));
$virtual_image = imagecreatetruecolor($desired_width, $desired_height);
imagecopyresampled($virtual_image, $source_image, 0, 0, 0, 0, $desired_width, $desired_height, $width, $height);
imagejpeg($virtual_image, $dest);
}
// File settings
$username = "user01"; // Example: you need some info to identify the user
$target_dir = "/images/"; // Folder for main images
$extension = array("jpeg","jpg","png"); // images only - add more extensions as required
$limit = 5242880; // max 5mb - change this if required
$upload = true; // Initially set to true unless checks fail!
$ext = strtolower(pathinfo($_FILES["user_photo"]["name"], PATHINFO_EXTENSION)); // Get file extension
$time = preg_replace('/(0).(d+) (d+)/', '$3$1$2', microtime()); // Unique prefix file name based on time
$dot = "."; // Just a dot
$new_filename = $time . $dot . $ext; // Full file name
// Delete image files & MYSQL record if already uploaded
$check = mysqli_query($con, "select image from images where user='$username'");
if (mysqli_num_rows($check) > 0) {
while ($row = mysqli_fetch_array($check)) {
$imageold = $row['image'];
unlink($_SERVER['DOCUMENT_ROOT'] . "/images/$imageold"); // Delete old image main file
unlink($_SERVER['DOCUMENT_ROOT'] . "/thumbs/$imageold"); // Delete old image thumb file
$delete = mysqli_prepare($con, "delete from images where user=?");
mysqli_stmt_bind_param($delete, "s", $username);
mysqli_stmt_execute($delete);
}
}
// Check file size
if ($_FILES["user_photo"]["size"] > $limit) {$upload = false;}
// Check file extension
if (in_array($ext, $extension) == false) {$upload = false;}
// Upload file if checks ok + insert image record to MYSQL table
if ($upload == true) {
move_uploaded_file($_FILES['user_photo']['tmp_name'], $target_dir . $new_filename);
$insert = mysqli_prepare($con, "insert into images (user,image) values (?,?)");
mysqli_stmt_bind_param($insert, "ss", $username, $new_filename);
mysqli_stmt_execute($insert);
}
// If main image inserted, create thumb
if ($insert) {
echo "FILE UPLOADED";
$select = mysqli_query($con, "select image from images where user='$username'");
if (mysqli_num_rows($select) == 1) {
while ($row = mysqli_fetch_array($select)) {
$imagename = $row['image'];
$src = "/images/$imagename";
$dest = "/thumbs/$imagename";
$desired_width = "250"; // This will create a square thumb at 250px, alter size if required
make_thumb($src, $dest, $desired_width); // Create thumb
// Now update existing user record to include thumb
$update = mysqli_prepare($con, "update images set thumb=? where user=?");
mysqli_stmt_bind_param($update, "ss", $imagename, $username);
mysqli_stmt_execute($update);
}
}
}
}
?>