What potential issues can arise when transitioning from PHP4 to PHP5?

One potential issue when transitioning from PHP4 to PHP5 is the deprecation of certain functions and features in PHP5 that were present in PHP4. To solve this issue, you will need to update your code to use the newer equivalents or alternative methods provided in PHP5. 

// PHP4 code using deprecated function ereg_replace
$new_string = ereg_replace('search', 'replace', $old_string);
```

```php
// PHP5 code using preg_replace as a replacement for ereg_replace
$new_string = preg_replace('/search/', 'replace', $old_string);

Keywords

backward compatibility deprecated features object-oriented programming error_reporting magic_quotes_runtime

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