What are some best practices for replacing deprecated functions like ereg() in PHP?

The ereg() function in PHP has been deprecated since PHP 5.3 and removed in PHP 7. To replace it, you can use the preg_match() function which provides similar functionality for regular expression matching. Simply update your code to use preg_match() instead of ereg() to ensure compatibility with newer PHP versions.

// Deprecated ereg() function
if (ereg('pattern', $string)) {
    // do something
}

// Replace with preg_match() function
if (preg_match('/pattern/', $string)) {
    // do something
}