Explain the difference between php4 and php5.
Answer / Digvijay Singh Rawat
PHP4 is an older version of PHP that is no longer supported. PHP5 introduced many new features, such as Object-Oriented Programming (OOP) support, MySQLi extension for database access, improved performance, and more secure functions. Major differences also include the use of `$this` instead of `$_object`, and the deprecation of functions like `register_globals`.
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