There are a number, but the big ones people are looking for are:
☛ PHP 5.0 realised the object model (AKA OOP).
☛ 5.1 added PDO - for accessing databases.
☛ 5.3 - added namespace support and late static bindings.
What is the purpose of $_SERVER variable in PHP?
What's the difference between the include() and require() functions?
How will you access the content type of the uploaded file in PHP?
What is Polymorphism in PHP context?
How will you access the uploaded file in PHP?
What is the Scope Resolution Operator?
What is the purpose of $_PHP_SELF variable in PHP?
What are the different types of PHP variables?
What are the 3 scope levels available in PHP and how would you define them?
What is the purpose of $php_errormsg variable in PHP?
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