what is variable scope, which variables are accessible from where and what are "undefined variable" errors?

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Is there a way to encrypt text from php?

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What is difference between single quotes and double quotes in php?

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What is overloading 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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What is the integer?

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Does it possible to compile php with mysql without having mysql sources?

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What is difference between ksort() and usort() functions.

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Does wordpress run on php 7?

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how many ways we get current date in php

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What are the uses of explode() function?

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What is associative array in php?

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