What is the significance of using + versus - for spaces in filenames in PHP?

When dealing with filenames in PHP, using + versus - for spaces can have different significance. Using + for spaces is commonly seen in URLs as a way to represent spaces, while using - is a more standard practice for file naming conventions. To handle this issue, it's important to properly encode and decode filenames to ensure compatibility and consistency.

// To encode a filename with spaces using +
$filename = "my file name.txt";
$encodedFilename = urlencode($filename);
echo $encodedFilename;

// To decode a filename with spaces using +
$decodedFilename = urldecode($encodedFilename);
echo $decodedFilename;