In my web page, the user will upload an image and then upon submission it should be compared with all the images in the directory and similar images should be output. I did this with md5 but it only outputs the exact image, I know the reason but I don't know how to loop all the images in my directory with the input image using RGB comparison... Can anyone help me ? This is my current code:
<?php
if(isset($_POST['submit'])){
$filepath=pathinfo($_FILES['file']['name']) ;
$extension=$filepath['extension'];
$iname= date('H-i-s').'.'.$extension;
$path='upload/'.$iname;
if(move_uploaded_file($_FILES['file']['tmp_name'],$path)){
$img=$path;
echo $img;
$f=md5(file_get_contents($img));
$images=glob("img/*");
foreach($images as $image){
if($f==md5(file_get_contents($image))){
echo "<img height='70px' width='70px' src='".$image."'/>";
}
}
}
}
?>
And my html code
<html>
<body>
<form method=post enctype="multipart/form-data">
<input type=file name=file><br><input type=submit name=submit value=submit>
</form>
</body>
</html> 
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
I used the class mentioned in this git repository to calculate image hashes and their differences.
https://github.com/nvthaovn/CompareImage
and change my code to:
<?php include('compareImages.php'); $flag = 0; if(isset($_POST['submit'])) { $filepath = pathinfo($_FILES['file']['name']); $extension = $filepath['extension']; $iname = date('H-i-s').'.'.$extension; $path = 'upload/'.$iname; if(move_uploaded_file($_FILES['file']['tmp_name'], $path)) { $compareMachine = new compareImages($path); $images = glob("img/*"); foreach($images as $image) { $diff = $compareMachine->compareWith($image); if($diff "; } } $flag = 1; } }