Are there any specific restrictions or considerations when naming PHP files with numbers in them?

When naming PHP files with numbers in them, it is important to avoid starting the file name with a number. This is because PHP file names cannot start with a number as it may cause syntax errors or confusion with numeric values in the code. It is recommended to use letters or underscores at the beginning of the file name to ensure compatibility and readability.

// Incorrect file name with number at the beginning
// 123file.php

// Correct file name without number at the beginning
// file123.php