What is the significance of the NULL return value in the context of realpath function in PHP?

The significance of the NULL return value in the context of the realpath function in PHP is that it indicates an error in resolving the path to a file or directory. This could be due to incorrect permissions, non-existent file or directory, or other issues. To handle this, you can check for the NULL return value and handle the error accordingly in your code. 

$path = '/path/to/file.txt';
$realpath = realpath($path);

if($realpath === false) {
    echo "Error resolving path.";
    // Handle the error here
} else {
    echo "Real path: " . $realpath;
    // Continue with the rest of your code
}

Keywords

realpath NULL return value significance PHP function

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