How to find the cause of php rename error

How to find the cause of the php rename error: 1. Add some security checks; 2. Turn on the error report "error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE);".

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How to find the error in PHP:rename() reason?

I want to print out the reason for the error.

error_get_last() doesn't seem to return anything. rename() returns true false, not an exception.

if (!rename($file->filepath, $full_path)) {
  $error = error_get_last();
  watchdog('name', "Failed to move the uploaded file from %source to   %dest", array('%source' => $file->filepath, '%dest' => $full_path));
}

Solution

First of all, it is best to add some security checks before the following situations:

if (file_exists($old_name) && 
    ((!file_exists($new_name)) || is_writable($new_name))) {
    rename($old_name, $new_name);
}

Secondly, you can turn on error reporting:

error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE);

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