PHP更改个人资料图片

Question

I am creating a social network project with PHP , HTML and CSS . One of the features the users have are to upload a profile picture . I just looked at a couple of tutorials and I've been following them but they a very confusing and I am completely lost . This is my last hope . I have some code in my upload.php file and when I go to that page It says File saved which means the image was saved but I don't see the image anywhere . Can someone help me save the image to my folder and when the user clicks change profile picture the picture get changed and saved ? Please help . Thank you .

profile.php :

<form id="form2" action="upload.php" method="post" enctype="multipart/form-data">
<p id="p1">Change profile picture:</p> <br />
<input type="file" name="fileToUpload" id="fileToUpload"><br />
<br><input id="sub1" type="submit" value="Change profile picture" 
name="submit"><br />
</form>

<!-- Trigger the Modal -->
<img id="myImg" src="default.png" width="200" height="150">

<!-- The Modal -->
<div id="myModal" class="modal">

<!-- The Close Button -->
<span class="close" 
onclick="document.getElementById('myModal').style.display='none'">&times;</span>

<!-- Modal Content (The Image) -->
<img class="modal-content" id="img01">

<!-- Modal Caption (Image Text) -->
<div id="caption"></div>
</div>
<script>
// Get the modal
var modal = document.getElementById('myModal');

// Get the image and insert it inside the modal - use its "alt" text as a 
caption
var img = document.getElementById('myImg');
var modalImg = document.getElementById("img01");
var captionText = document.getElementById("caption");
img.onclick = function(){
modal.style.display = "block";
modalImg.src = this.src;
captionText.innerHTML = this.alt;
}

// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];

// When the user clicks on <span> (x), close the modal
span.onclick = function() { 
modal.style.display = "none";
}
</script>

upload.php :

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

include("connect.php"); 
include("auth_login.php"); 

$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);

// Check if image file is a actual image or fake image

if(isset($_POST["submit"])) {
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) {
    echo "File saved - " . $check["mime"] . ".";
    $uploadOk = 1;
} else {
    echo "File is not an image.";
    $uploadOk = 0;
}
}

Answer 1

Your target file never gets moved to the actual dir! It stays in the temporary dir:

in the if add a file move:

move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file);