Rename a file if already exists - php upload system

问题

I this PHP code:

<?php

// Check for errors
if($_FILES['file_upload']['error'] > 0){
    die('An error ocurred when uploading.');
}

if(!getimagesize($_FILES['file_upload']['tmp_name'])){
    die('Please ensure you are uploading an image.');
}

// Check filesize
if($_FILES['file_upload']['size'] > 500000){
    die('File uploaded exceeds maximum upload size.');
}

// Check if the file exists
if(file_exists('upload/' . $_FILES['file_upload']['name'])){
    die('File with that name already exists.');
}

// Upload file
if(!move_uploaded_file($_FILES['file_upload']['tmp_name'], 'upload/' . $_FILES['file_upload']['name'])){
    die('Error uploading file - check destination is writeable.');
}

die('File uploaded successfully.');

?>

and I need to act like a "windows" kind of treatment for existing files - I mean the if the file exists, i want it to be changed to the name of the file with the number 1 after it.

for example: myfile.jpg is already exists, so if you'll upload it again it will be myfile1.jpg, and if myfile1.jpg exists, it will be myfile11.jpg and so on...

how can i do it? i tried some loops but unfortunately without success.

回答1:

You could do something like this:

$name = pathinfo($_FILES['file_upload']['name'], PATHINFO_FILENAME);
$extension = pathinfo($_FILES['file_upload']['name'], PATHINFO_EXTENSION);

// add a suffix of '1' to the file name until it no longer conflicts
while(file_exists($name . '.' . $extension)) {
    $name .= '1';
}

$basename = $name . '.' . $extension;

To avoid very long names, it would probably be neater to append a number, e.g. file1.jpg, file2.jpg etc:

$name = pathinfo($_FILES['file_upload']['name'], PATHINFO_FILENAME);
$extension = pathinfo($_FILES['file_upload']['name'], PATHINFO_EXTENSION);

$increment = ''; //start with no suffix

while(file_exists($name . $increment . '.' . $extension)) {
    $increment++;
}

$basename = $name . $increment . '.' . $extension;

回答2:

You uploaded a file called demo.png.
You tried to upload the same file demo.png and it got renamed to demo2.png.
When you try to upload demo.png for 3rd time, it gets renamed to demo1.png once again and replaces the file you upload in (2).

so you won't find demo3.png

来源：https://stackoverflow.com/questions/18972518/rename-a-file-if-already-exists-php-upload-system

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