What is isset function in php?

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What is the difference between query and question?

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Does php support overloading?

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Explain the changes in php versions?

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Why namespace is used in php?

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Tell me what are the different types of errors in php?

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class Database { public static $_instance; public static function getInstance() { if(!isset(self::$_instance)) self::$_instance = new Database(DB_SERVER, DB_USER, DB_PASS, DB_NAME); print_r(self::$_instance); return self::$_instance; } } can any one explain "self::$_instance = new Database(DB_SERVER, DB_USER, DB_PASS, DB_NAME);" this line

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Tell me how can I display text with a php script?

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How to generate a form?

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Which of the following represents the proper way to set a session variable? Answer: a. $_SESSION['foo'] = 'bar'; b. session_start(); c. session_set_save_handler ('myopen', 'myclose', 'myread', 'mywrite', 'mydelete', 'mygarbage'); d. $foo = $_SESSION['foo']; 2.When administering MySQL, you should make the data directory accessible via the operating system 3.which statement can be used to determine how the optimizer resolves a query

9 Answers   Cybercom, TCS,

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Can I use php in html?

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Distinguish between urlencode and urldecode?

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