我有一个"个人资料图片"系统,每个注册用户都可以更改他们的个人资料图片,以便显示图片。上传的过程是上传名为pictures
的文件夹中的图像,然后将文件名写入名为"picture"
的数据库行,这很有效,一切都很好,但我需要知道如何哈希上传的图片的名称,所以如果两个图片不同但图片名称相同的人会上传一个文件,就会出现问题。。。
这是我的提交表格:
<form action="" method="post" enctype="multipart/form-data">
<input type="file" name="file">
<input type="submit" name="submit">
</form>
我有这样的代码上传文件到文件夹和数据库行:
<?php
if(isset($_POST['submit'])){
move_uploaded_file($_FILES['file']['tmp_name'],"pictures/".$user_id.$_FILES['file']['name']);
$con = mysqli_connect("host","name","pass","db");
$q = mysqli_query($con,"UPDATE members SET picture = '".$_FILES['file']['name']."' WHERE username = '".$_SESSION['username']."'");
}
?>
这是在网站上显示图片的代码:
<?php
$con = mysqli_connect("host","name","pass","db");
$q = mysqli_query($con,"SELECT * FROM members WHERE username = '".$_SESSION['username']."'");
while($row = mysqli_fetch_assoc($q)){
if($row['picture'] == ""){
echo " <img src='pictures/public_icon.png' width='25' height='25'>"; *//This is default pic//*
} else {
echo " <img width='25' height='25' src='pictures/".$row['picture']."' alt='Profile Pic'>"; *//And this is pic from db row//*
}
}
?>
我想知道如何在上传的文件夹和数据库行中散列这张照片的名称。。。我能做热的吗?我会用数据库中的"id"answers"date"行来处理它,但我不知道如何处理..:/
将其用于上传:
<?php
if(isset($_POST['submit'])){
/*
* create a unique file name with the current time and ip address of
* user, since it is highly unlikely to have the same file uploaded
*form the same ip address at the same time
*/
$unique_file_name = time(). $_SERVER['REMOTE_ADDR']. $_FILES['file']['name'];
//run query only if file upload and transfer succeeded
if( move_uploaded_file($_FILES['file']['tmp_name'],"pictures/".$user_id. $unique_file_name) ){
$con = mysqli_connect("host","name","pass","db");
$q = mysqli_query($con,"UPDATE members SET picture = '".$_FILES['file']['name']."' WHERE username = '".$_SESSION['username']."'");
}
}
?>
你可以试试这个
<?php
if(isset($_POST['submit'])){
$filename = $user_id.$_FILES['file']['name'];
move_uploaded_file($_FILES['file']['tmp_name'],"pictures/".$filename);
$con = mysqli_connect("host","name","pass","db");
$q = mysqli_query($con,"UPDATE members SET picture = '".$filename."' WHERE username = '".$_SESSION['username']."'");
} ?>