List some features of php that are deprecated in php

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I am trying to assign a variable the value of 0123, but it keeps coming up with a different number, what is the problem?

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How do I check if a given variable is empty?

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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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Is php still relevant 2019?

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How should a model be structured in mvc?

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How can I prevent sql-injection in php?

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How to execute an sql query? How to fetch its result?

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What is php routing?

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What are the different ways to login to a remote server? Explain the me, advantages and disadvantages?

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Are php session secure?

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Tell us how can we display the output directly to the browser?

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