我有一个我强迫用户上传图像和其他详细信息等。在我的根目录中,我创建了一个名为(user_image),但问题是..用户可以插入大文件,以便网页的加载很慢。在上传到数据库之前,如何调整大小...
这是我的代码...
if(isset($_POST['btnsave']))
{
$camname = $_POST['cam_name'];// user name
$modelname = $_POST['model'];// user email
$rentpday = $_POST['rent_pday'];// user name
$usermob = $_POST['mob'];// user email
$useraddrs = $_POST['addrs'];// user email
$upd_date =date('Y-m-d H:i:s');//upl_date
$imgFile = $_FILES['user_image']['name'];
$tmp_dir = $_FILES['user_image']['tmp_name'];
$imgSize = $_FILES['user_image']['size'];
if(empty($camname)){
$errMSG = "Please Enter Cam name.";
}
else if(empty($usermob)){
$errMSG = "Please mobile number";
}
else if(empty($camname)){
$errMSG = "Please enter cam_name";
}
else if(empty($modelname)){
$errMSG = "Please enter model";
}
else if(empty($rentpday)){
$errMSG = "Please enter rent per day";
}
else if(empty($imgFile)){
$errMSG = "Please Select Image File.";
}
else
{
$upload_dir = 'user_images/'; // upload directory
$imgExt = strtolower(pathinfo($imgFile,PATHINFO_EXTENSION)); // get image extension
// valid image extensions
$valid_extensions = array('jpeg', 'jpg', 'png', 'gif'); // valid extensions
// rename uploading image
$userpic = rand(1000,1000000).".".$imgExt;
// allow valid image file formats
if(in_array($imgExt, $valid_extensions)){
// Check file size '5MB'
if($imgSize < 5000000) {
move_uploaded_file($tmp_dir,$upload_dir.$userpic);
}
else{
$errMSG = "Sorry, your file is too large.";
}
}
else{
$errMSG = "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
}
}
// if no error occured, continue ....
if(!isset($errMSG))
{
$stmt = $user_home->runQuery("UPDATE post_data
set cam_name=?,
cam_model =?,
cam_rent=?,
cam_img=?,
mobile=?,
address=?,
upd_date=?
where userID=?
");
$stmt->bindParam(1,$camname);
$stmt->bindParam(2,$modelname);
$stmt->bindParam(3,$rentpday);
$stmt->bindParam(4,$userpic);
$stmt->bindParam(5,$usermob);
$stmt->bindParam(6,$useraddrs);
$stmt->bindParam(7,$upd_date);
$stmt->bindParam(8,$id);
if($stmt->execute())
{
$successMSG = "Record saved success";
}
else
{
$errMSG = "error while inserting....";
}
}
}
此代码中的任何更改以在上传之前压缩图像大小。预先感谢..
afaik,在减少图像大小的同时,您无法保持质量。您可以使用 imagejpeg
,通过降低IT质量来减少图像的大小。
当您要保存图像时,您需要先降低图像的质量。
if($imgSize < 5000000) {
$image = imagecreatefromjpeg($upload_dir.$userpic);
imagejpeg($image, $new_image_path, 70);
move_uploaded_file($tmp_dir,$new_image_path);
}
压缩图像实际上非常容易。只需将它们全部更改为PNG:
$image = imagecreatefromstring(file_get_contents($tmp_dir));
$saveLocation = “user_images/”.md5(uniqid()).”png”;
//Please use this instead of your current file naming method to remove the possibility of a duplicate (which rand will sometimes yield)
imagepng($image,$saveLocation,9);
//9 represents the compression level (0 no compression - 9 max compression)
就是这样!PNG是一种无损压缩方法,因此您不会在此过程中失去任何质量